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Nicolas P, Abdallah S, Dok A, de Coene Y, Jeannin O, Bellec N, Malval JP, Verbiest T, Clays K, Van Cleuvenbergen S, Bilgin-Eran B, Akdas-Kiliç H, Camerel F. Non-Linear Optical Activity of Chiral Bipyrimidine-Based Thin Films. Chem Asian J 2024; 19:e202400112. [PMID: 38353579 DOI: 10.1002/asia.202400112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 02/13/2024] [Indexed: 03/01/2024]
Abstract
An original series of bipyrimidine-based chromophores featuring alkoxystyryl donor groups bearing short chiral (S)-2-methylbutyl chains in positions 4, 3,4 and 3,5, connected to electron-accepting 2,2-bipyrimidine rings, has been developed. Their linear and non-linear optical properties were studied using a variety of techniques, including one- and two-photon absorption spectroscopy, fluorescence measurements, as well as Hyper-Rayleigh scattering to determine the first hyperpolarizabilities. Their electronic and geometrical properties were rationalized by TD-DFT calculations. The thermal properties of the compounds were also investigated by a combination of polarized light optical microscopy, differential scanning calorimetry measurements and small-angle X-ray scattering experiments. The derivatives were found not to have mesomorphic properties, but to exhibit melting temperatures or cold crystallization behavior that enabled the isolation of well-organized thin films. The nonlinear optical properties of amorphous or crystalline thin films were studied by wide-field second harmonic generation and multiphoton fluorescence imaging, confirming that non-centrosymmetric crystal organization enables strong second and third harmonic generation. This new series confirms that our strategy of functionalizing 3D organic octupoles with short chiral chains to generate non-centrosymmetric organized thin films enables the development of highly second order nonlinear optical active materials without the use of corona-poling or tedious deposition techniques.
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Affiliation(s)
- Prescillia Nicolas
- Institut des Sciences Chimiques de Rennes, CNRS-UMR 6226, Université de Rennes, Rennes, France
| | - Stephania Abdallah
- Institut de Science des Matériaux de Mulhouse, CNRS-UMR 7361, Université de Haute Alsace, Mulhouse, France
| | - Ahmet Dok
- Department of Chemistry, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Yovan de Coene
- Department of Chemistry, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Olivier Jeannin
- Institut des Sciences Chimiques de Rennes, CNRS-UMR 6226, Université de Rennes, Rennes, France
| | - Nathalie Bellec
- Institut des Sciences Chimiques de Rennes, CNRS-UMR 6226, Université de Rennes, Rennes, France
| | - Jean-Pierre Malval
- Institut de Science des Matériaux de Mulhouse, CNRS-UMR 7361, Université de Haute Alsace, Mulhouse, France
| | - Thierry Verbiest
- Department of Chemistry, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Koen Clays
- Department of Chemistry, Katholieke Universiteit Leuven, Leuven, Belgium
| | | | | | - Huriye Akdas-Kiliç
- Institut des Sciences Chimiques de Rennes, CNRS-UMR 6226, Université de Rennes, Rennes, France
- Department of Chemistry, Yildiz Technical University, Istanbul, Turkey
| | - Franck Camerel
- Institut des Sciences Chimiques de Rennes, CNRS-UMR 6226, Université de Rennes, Rennes, France
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2
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Cheng J, Gao D, Dong J, Zhang X. Efficient second harmonic generation in a high-Q Fabry-Perot microresonator on x-cut thin film lithium niobate. OPTICS EXPRESS 2024; 32:12118-12126. [PMID: 38571044 DOI: 10.1364/oe.521331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Accepted: 03/13/2024] [Indexed: 04/05/2024]
Abstract
Microresonators facilitate enhanced light-matter interactions within a limited space, showing great promise for nonlinear optics. Here, we demonstrate a high-quality (Q) factor Fabry-Perot microresonator (FPR) for second harmonic generation (SHG) on an x-cut thin film lithium niobate (TFLN) platform. The FPR exhibits Q factors of Qpump = 1.09 × 105 and QSH = 1.15 × 104 at the 1560 nm pump wavelength and 780 nm second harmonic wavelength, respectively. Under low pump power, a normalized SHG efficiency of 158.5 ± 18.5%/W is attained. We experimentally verify that increased temperatures mitigate photorefractive effects that degrade SHG performance. This work highlights the immense capabilities of one-dimensional planar optical waveguide resonators for efficient on-chip nonlinear wavelength conversion.
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3
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Chen YC, Chen PH, Liao YS, Chou JP, Wu JM. Defect Engineering Centrosymmetric 2D Material Flexocatalysts. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2401116. [PMID: 38456370 DOI: 10.1002/smll.202401116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 02/24/2024] [Indexed: 03/09/2024]
Abstract
In this study, the flexoelectric characteristics of 2D TiO2 nanosheets are examined. The theoretical calculations and experimental results reveal an excellent strain-induced flexoelectric potential (flexopotential) by an effective defect engineering strategy, which suppresses the recombination of electron-hole pairs, thus substantially improving the catalytic activity of the TiO2 nanosheets in the degradation of Rhodamine B dye and the hydrogen evolution reaction in a dark environment. The results indicate that strain-induced bandgap reduction enhances the catalytic activity of the TiO2 nanosheets. In addition, the TiO2 nanosheets degraded Rhodamine B, with kobs being ≈1.5 × 10-2 min-1 in dark, while TiO2 nanoparticles show only an adsorption effect. 2D TiO2 nanosheets achieve a hydrogen production rate of 137.9 µmol g-1 h-1 under a dark environment, 197% higher than those of TiO2 nanoparticles (70.1 µmol g-1 h-1 ). The flexopotential of the TiO2 nanosheets is enhanced by increasing the bending moment, with excellent flexopotential along the y-axis. Density functional theory is used to identify the stress-induced bandgap reduction and oxygen vacancy formation, which results in the self-dissociation of H2 O on the surface of the TiO in the dark. The present findings provide novel insights into the role of TiO2 flexocatalysis in electrochemical reactions.
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Affiliation(s)
- Yu-Ching Chen
- Department of Materials Science and Engineering, National Tsing Hua University, 101 Section 2 Kuang Fu Road, Hsinchu, 300, Taiwan
- Ph.D. Program in Prospective Functional Materials Industry, National Tsing Hua University, 101 Section 2 Kuang Fu Road, Hsinchu, 300, Taiwan
| | - Po-Han Chen
- Department of Materials Science and Engineering, National Tsing Hua University, 101 Section 2 Kuang Fu Road, Hsinchu, 300, Taiwan
| | - Yin-Song Liao
- Department of Materials Science and Engineering, National Tsing Hua University, 101 Section 2 Kuang Fu Road, Hsinchu, 300, Taiwan
- Tsing Hua Interdisciplinary Program, National Tsing Hua University, 101 Section 2 Kuang Fu Road, Hsinchu, 300, Taiwan
| | - Jyh-Pin Chou
- Department of Physics, National Changhua University of Education, No. 1 Jin-De Road, Changhua, 500, Taiwan
| | - Jyh Ming Wu
- Department of Materials Science and Engineering, National Tsing Hua University, 101 Section 2 Kuang Fu Road, Hsinchu, 300, Taiwan
- High Entropy Materials Center, National Tsing Hua University, 101 Section 2 Kuang Fu Road, Hsinchu, 300, Taiwan
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4
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Du H, Zhang X, Lv H, Lin J, Wang L, Chen F. High-efficiency second harmonic generation in a micro-resonator on dual-layered lithium niobate. OPTICS LETTERS 2024; 49:391-394. [PMID: 38194576 DOI: 10.1364/ol.507932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 12/08/2023] [Indexed: 01/11/2024]
Abstract
High-quality micro-resonators on thin-film lithium niobate (TFLN) have emerged as an ideal platform for on-chip nonlinear optical applications due to their strong light confinement and excellent natural nonlinear optical properties. Here, we present high-efficiency second-harmonic generation (SHG) in micro-resonators on a TFLN based on the modal phase matching and natural quasi-phase matching. By optimizing the phase-matching conditions through thermal tuning, we demonstrate an on-chip SHG efficiency of 149,000%/W in the low power regime. Furthermore, we achieve an absolute conversion efficiency of 10.3% with a 0.3 mW pump power. Our work paves the way toward future efficient on-chip frequency conversion of classical and quantum light without the need for poling of the LN films.
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5
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Zhou YR, Zhang QF, Liu FF, Han YH, Gao YP, Fan L, Zhang R, Cao C. Controllable nonreciprocal phonon laser in a hybrid photonic molecule based on directional quantum squeezing. OPTICS EXPRESS 2024; 32:2786-2803. [PMID: 38297799 DOI: 10.1364/oe.512280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Accepted: 01/01/2024] [Indexed: 02/02/2024]
Abstract
Here, a scheme for a controllable nonreciprocal phonon laser is proposed in a hybrid photonic molecule system consisting of a whispering-gallery mode (WGM) optomechanical resonator and a χ(2)-nonlinear WGM resonator, by directionally quantum squeezing one of two coupled resonator modes. The directional quantum squeezing results in a chiral photon interaction between the resonators and a frequency shift of the squeezed resonator mode with respect to the unsqueezed bare mode. We show that the directional quantum squeezing can modify the effective optomechanical coupling in the optomechanical resonator, and analyze the impacts of driving direction and squeezing extent on the phonon laser action in detail. Our analytical and numerical results indicate that the controllable nonreciprocal phonon laser action can be effectively realized in this system. The proposed scheme uses an all-optical and chip-compatible approach without spinning resonators, which may be more beneficial for integrating and packaging of the system on a chip. Our proposal may provide a new route to realize integratable phonon devices for on-chip nonreciprocal phonon manipulations, which may be used in chiral quantum acoustics, topological phononics, and acoustical information processing.
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Kumar CHSSP, Klimov NN, Kuo PS. Optimization of waveguide fabrication processes in lithium-niobate-on-insulator platform. AIP ADVANCES 2024; 14:10.1063/6.0003522. [PMID: 38915883 PMCID: PMC11194688 DOI: 10.1063/6.0003522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/26/2024]
Abstract
Lithium niobate (LN) is used in diverse applications such as spectroscopy, remote sensing, and quantum communications. The emergence of lithium-niobate-on-insulator (LNOI) technology and its commercial accessibility represent significant milestones. This technology aids in harnessing the full potential of LN's properties, such as achieving tight mode confinement and strong overlap with applied electric fields, which has enabled LNOI-based electro-optic modulators to have ultra-broad bandwidths with low-voltage operation and low power consumption. Consequently, LNOI devices are emerging as competitive contenders in the integrated photonics landscape. However, the nanofabrication, particularly LN etching, presents a notable challenge. LN is hard, dense, and chemically inert. It has anisotropic etch behavior and a propensity to produce material redeposition during the reactive-ion plasma etch process. These factors make fabricating low-loss LNOI waveguides (WGs) challenging. Recognizing the pivotal role of addressing these fabrication challenges for obtaining low-loss WGs, our research focuses on a systematic study of various process steps in fabricating LNOI WGs and other photonic structures. In particular, our study involves (i) careful selection of hard mask materials, (ii) optimization of inductively coupled plasma etch parameters, and finally, (iii) determining the optimal post-etch cleaning approach to remove redeposited material on the sidewalls of the etched photonic structures. Using the recipe established, we realized optical WGs with total (propagation and coupling) loss value of -10.5 dB, comparable to established values found in the literature. Our findings broaden our understanding of optimizing fabrication processes for low-loss lithium-niobate waveguides and can serve as an accessible resource in advancing LNOI technology.
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Affiliation(s)
- CH. S. S. Pavan Kumar
- Information Technology Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899
| | - Nikolai N. Klimov
- Physical Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899
| | - Paulina S. Kuo
- Information Technology Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899
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7
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Clementi M, Nitiss E, Liu J, Durán-Valdeiglesias E, Belahsene S, Debrégeas H, Kippenberg TJ, Brès CS. A chip-scale second-harmonic source via self-injection-locked all-optical poling. LIGHT, SCIENCE & APPLICATIONS 2023; 12:296. [PMID: 38062066 PMCID: PMC10703906 DOI: 10.1038/s41377-023-01329-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 10/10/2023] [Accepted: 11/06/2023] [Indexed: 03/27/2024]
Abstract
Second-harmonic generation allows for coherently bridging distant regions of the optical spectrum, with applications ranging from laser technology to self-referencing of frequency combs. However, accessing the nonlinear response of a medium typically requires high-power bulk sources, specific nonlinear crystals, and complex optical setups, hindering the path toward large-scale integration. Here we address all of these issues by engineering a chip-scale second-harmonic (SH) source based on the frequency doubling of a semiconductor laser self-injection-locked to a silicon nitride microresonator. The injection-locking mechanism, combined with a high-Q microresonator, results in an ultra-narrow intrinsic linewidth at the fundamental harmonic frequency as small as 41 Hz. Owing to the extreme resonant field enhancement, quasi-phase-matched second-order nonlinearity is photoinduced through the coherent photogalvanic effect and the high coherence is mapped on the generated SH field. We show how such optical poling technique can be engineered to provide efficient SH generation across the whole C and L telecom bands, in a reconfigurable fashion, overcoming the need for poling electrodes. Our device operates with milliwatt-level pumping and outputs SH power exceeding 2 mW, for an efficiency as high as 280%/W under electrical driving. Our findings suggest that standalone, highly-coherent, and efficient SH sources can be integrated in current silicon nitride photonics, unlocking the potential of χ(2) processes in the next generation of integrated photonic devices.
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Affiliation(s)
- Marco Clementi
- Photonic Systems Laboratory (PHOSL), École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.
| | - Edgars Nitiss
- Photonic Systems Laboratory (PHOSL), École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - Junqiu Liu
- Laboratory of Photonics and Quantum Measurements (LPQM), École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | | | | | | | - Tobias J Kippenberg
- Laboratory of Photonics and Quantum Measurements (LPQM), École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - Camille-Sophie Brès
- Photonic Systems Laboratory (PHOSL), École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.
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8
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Cheng J, Gao D, Dong J, Zhang X. Ultra-efficient second harmonic generation via mode phase matching in integrated lithium niobate racetrack resonators. OPTICS EXPRESS 2023; 31:36736-36744. [PMID: 38017817 DOI: 10.1364/oe.503988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 10/02/2023] [Indexed: 11/30/2023]
Abstract
High-efficiency second harmonic generation (SHG) relying solely on intermodal dispersion engineering remains a challenge. Here, we realize highly efficient SHG using a double-waveguide coupled racetrack microring resonator on X-cut lithium niobate on insulator (LNOI), where both pump and second harmonic (SH) approach critical coupling. Through precise temperature tuning, simultaneous pump and SH resonance is attained in the resonator, dramatically enhancing SHG efficiency. With low pump power, a normalized conversion efficiency of 9972%/W is achieved. Moreover, the resonator provides a 25.73 dB enhancement in SHG efficiency compared to a 4 mm straight waveguide with identical phase matching in our experiment. This work enables efficient wavelength conversion and quantum state generation on integrated X-cut LNOI platforms.
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9
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Parfenov M, Agruzov P, Tronev A, Ilichev I, Usikova A, Zadiranov Y, Shamrai A. Metal Electrodes for Filtering the Localized Fundamental Mode of a Ridge Optical Waveguide on a Thin Lithium Niobate Nanofilm. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2755. [PMID: 37887906 PMCID: PMC10608870 DOI: 10.3390/nano13202755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 10/06/2023] [Accepted: 10/08/2023] [Indexed: 10/28/2023]
Abstract
An approach for filtering the fundamental mode in an integrated optical modulator with multimode waveguides based on etched thin lithium niobate nanofilms is presented. It is shown that metal electrodes can be used as a modal filter to suppress high-order modes in wide multimode ridge waveguides and, consequently, to provide their quasi-single-mode regime of operation. The influence of the gap between the electrodes and its displacement relative to the waveguide symmetry axis is analyzed for various configurations of waveguides. The conditions for quasi-single-mode light propagation with suppression of high-order modes of more than 90 dB/cm are found. The influence of fabrication errors on the efficiency of modal filtering is discussed. Efficient electro-optical modulation with an equivalent voltage-length product of 4 V∙cm has been experimentally demonstrated on integrated optical phase modulator samples fabricated using conventional contact photolithography. The proposed topological solution can be further used for the fast and cheap fabrication of TFLN modulators by conventional contact photolithography. The proposed modal filtering can also be used in other waveguide topologies and in more complex waveguide devices.
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Affiliation(s)
- Mikhail Parfenov
- Ioffe Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
| | | | | | | | | | | | - Aleksandr Shamrai
- Ioffe Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
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10
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Gromovyi M, Bhat N, Tronche H, Baldi P, Kurdi ME, Checoury X, Damilano B, Boucaud P. Intrinsic polarity inversion in III-nitride waveguides for efficient nonlinear interactions. OPTICS EXPRESS 2023; 31:31397-31409. [PMID: 37710660 DOI: 10.1364/oe.501221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 08/28/2023] [Indexed: 09/16/2023]
Abstract
III-nitrides provide a versatile platform for nonlinear photonics. In this work, we explore a new promising configuration - composite waveguides containing GaN and AlN layers with inverted polarity, i.e., having opposite signs of the χ(2) nonlinear coefficient. This configuration allows us to address the limiting problem of the mode overlap for nonlinear interactions. Our modelling predicts a significant improvement in the conversion efficiency. We confirm our theoretical prediction with the experimental demonstration of second harmonic generation with an efficiency of 4%W-1cm-2 using a simple ridge waveguide. This efficiency is an order of magnitude higher compared to the previously reported results for III-nitride waveguides. Further improvement, reaching a theoretical efficiency of 30%W-1cm-2, can be achieved by reducing propagation losses.
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11
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Zamboni R, Gauthier-Manuel L, Zaltron A, Lucchetti L, Chauvet M, Sada C. Opto-microfluidic coupling between optical waveguides and tilted microchannels in lithium niobate. OPTICS EXPRESS 2023; 31:28423-28436. [PMID: 37710896 DOI: 10.1364/oe.495406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 07/05/2023] [Indexed: 09/16/2023]
Abstract
This work presents a reconfigurable opto-microfluidic coupling between optical waveguides and tilted microfluidic channels in monolithic lithium niobate crystal. The light path connecting two waveguide arrays located on opposite sides of a microfluidic channel depends on the refractive index between the liquid phase and the hosting crystal. As a result, the optical properties of the flowing fluid, which is pumped into the microfluidic channel on demand, can be exploited to control the light pathways inside the optofluidic device. Proof-of-concept applications are herein presented, including microfluidic optical waveguide switching, optical refractive index sensing, and wavelength demultiplexing.
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12
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Li Z, Wang RN, Lihachev G, Zhang J, Tan Z, Churaev M, Kuznetsov N, Siddharth A, Bereyhi MJ, Riemensberger J, Kippenberg TJ. High density lithium niobate photonic integrated circuits. Nat Commun 2023; 14:4856. [PMID: 37563149 PMCID: PMC10415301 DOI: 10.1038/s41467-023-40502-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Accepted: 07/26/2023] [Indexed: 08/12/2023] Open
Abstract
Photonic integrated circuits have the potential to pervade into multiple applications traditionally limited to bulk optics. Of particular interest for new applications are ferroelectrics such as Lithium Niobate, which exhibit a large Pockels effect, but are difficult to process via dry etching. Here we demonstrate that diamond-like carbon (DLC) is a superior material for the manufacturing of photonic integrated circuits based on ferroelectrics, specifically LiNbO3. Using DLC as a hard mask, we demonstrate the fabrication of deeply etched, tightly confining, low loss waveguides with losses as low as 4 dB/m. In contrast to widely employed ridge waveguides, this approach benefits from a more than one order of magnitude higher area integration density while maintaining efficient electro-optical modulation, low loss, and offering a route for efficient optical fiber interfaces. As a proof of concept, we demonstrate a III-V/LiNbO3 based laser with sub-kHz intrinsic linewidth and tuning rate of 0.7 PHz/s with excellent linearity and CMOS-compatible driving voltage. We also demonstrated a MZM modulator with a 1.73 cm length and a halfwave voltage of 1.94 V.
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Affiliation(s)
- Zihan Li
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland
- Center of Quantum Science and Engineering (EPFL), CH-1015, Lausanne, Switzerland
| | - Rui Ning Wang
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland
- Center of Quantum Science and Engineering (EPFL), CH-1015, Lausanne, Switzerland
| | - Grigory Lihachev
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland
- Center of Quantum Science and Engineering (EPFL), CH-1015, Lausanne, Switzerland
| | - Junyin Zhang
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland
- Center of Quantum Science and Engineering (EPFL), CH-1015, Lausanne, Switzerland
| | - Zelin Tan
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland
- Center of Quantum Science and Engineering (EPFL), CH-1015, Lausanne, Switzerland
| | - Mikhail Churaev
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland
- Center of Quantum Science and Engineering (EPFL), CH-1015, Lausanne, Switzerland
| | - Nikolai Kuznetsov
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland
- Center of Quantum Science and Engineering (EPFL), CH-1015, Lausanne, Switzerland
| | - Anat Siddharth
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland
- Center of Quantum Science and Engineering (EPFL), CH-1015, Lausanne, Switzerland
| | - Mohammad J Bereyhi
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland
- Center of Quantum Science and Engineering (EPFL), CH-1015, Lausanne, Switzerland
- Luxtelligence SA, CH-1015, Lausanne, Switzerland
| | - Johann Riemensberger
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland
- Center of Quantum Science and Engineering (EPFL), CH-1015, Lausanne, Switzerland
| | - Tobias J Kippenberg
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland.
- Center of Quantum Science and Engineering (EPFL), CH-1015, Lausanne, Switzerland.
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13
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Du H, Zhang X, Wang L, Jia Y, Chen F. Tunable sum-frequency generation in modal phase-matched thin film lithium niobate rib waveguides. OPTICS LETTERS 2023; 48:3159-3162. [PMID: 37319051 DOI: 10.1364/ol.491609] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 05/11/2023] [Indexed: 06/17/2023]
Abstract
In this work, we report a highly efficient and tunable on-chip sum-frequency generation (SFG) on a thin-film lithium niobate platform via modal phase matching (e + e→e). It provides on-chip SFG a solution with both high efficiency and poling-free by using the highest nonlinear coefficient d33 instead of d31. The on-chip conversion efficiency of SFG is approximately 2143%W-1 with a full width at half maximum (FWHM) of 4.4 nm in a 3-mm-long waveguide. It can find applications in chip-scale quantum optical information processing and thin-film lithium niobate based optical nonreciprocity devices.
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14
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Xu C, Wu H, He Y, Xu L. Efficient Second- and Third-Harmonic Generations in Er 3+/Fe 2+-Doped Lithium Niobate Single Crystal with Engineered Surficial Cylindrical Hole Arrays. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13101639. [PMID: 37242055 DOI: 10.3390/nano13101639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 05/09/2023] [Accepted: 05/12/2023] [Indexed: 05/28/2023]
Abstract
Herein, significant enhancement of second- and third-harmonic generation efficiencies in a 1 mol% Er3+ and 0.07 mol% Fe2+-doped lithium niobate single-crystal plate were achieved after ablating periodic cylindrical pit arrays on the surface. Enhanced absorption and reduced transmittance of light were measured when the incident light signal passed through the patterned sample. Enhanced photoluminescence and two-photon-pumped upconversion emission spectra were also explored to obtain more details on the efficiency gains. The excitation-energy-dependent second-harmonic generation efficiency was measured, and an enhancement as high as 20-fold was calculated. The conversion efficiency of second-harmonic generation is 1 to 3 orders higher than that from other lithium niobite metasurfaces and nanoantennas. This work provides a convenient and effective method to improve the nonlinear conversion efficiency in a thin lithium niobite plate, which is desirable for applying to integrated optical devices.
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Affiliation(s)
- Caixia Xu
- School of Primary Education, Chongqing Normal University, Chongqing 400700, China
- School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China
| | - Hongli Wu
- School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China
| | - Yanwei He
- Department of Electrical and Computer Engineering, University of California, Riverside, CA 92521, USA
| | - Long Xu
- Chongqing Key Laboratory of Micro&Nano Structure Optoelectronics, School of Physical Science and Technology, Southwest University, Chongqing 400715, China
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15
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Kalimullah NMM, Shukla K, Shelke A, Habib A. Stiffness tensor estimation of anisotropic crystal using point contact method and unscented Kalman filter. ULTRASONICS 2023; 131:106939. [PMID: 36753815 DOI: 10.1016/j.ultras.2023.106939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 01/23/2023] [Accepted: 01/26/2023] [Indexed: 06/18/2023]
Abstract
The potential application of Lithium Niobate (LiNbO3) crystal is immense, specifically in the domain of meta-surfaces and nano-resonators. However, the practical application of LiNbO3 is impeded due to unreliable experimental techniques and inaccurate inversion algorithms for material characterization. In the current research, material characterization of anisotropic crystal is proposed by exploring the wavefield evolution in the spatial and temporal domains. The presented framework has three major components: a physics-based mathematical model (Christoffel equation), a novel experimental technique, and an inversion algorithm based on Bayesian filtering. An experimental technique based on Coulomb coupling is devised to visualize the propagation of ultrasonic waves in an anisotropic crystal. The crystal is characterized by measuring the directional-dependent acoustic wave velocity from the spatial-temporal information of the wave propagation. The anisotropic constitutive properties of the crystal are estimated by exploring the wave velocity in the Bayesian filtering algorithm. The proposed algorithm is based on the probabilistic framework that integrates the experimental measurement in a physics-based mathematical model for optimal state prediction of stiffness tensor through the Bayesian filtering algorithm. In particular, we utilize the unscented Kalman filter (UKF) in conjunction with the plane-wave Eigen solution to estimate the constitutive parameters. In the presence of measurement uncertainties, the performance of the optimal prediction algorithm is illustrated by comparing the estimated parameter with the corresponding theoretical value. The comparison demonstrates that the proposed inversion algorithm is efficient and robust and performs satisfactorily even with significant measurement uncertainties.
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Affiliation(s)
- Nur M M Kalimullah
- Department of Civil Engineering, Indian Institute of Technology Guwahati, Assam 781039, India
| | - Kaushik Shukla
- Department of Electronics Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad, Jharkhand 826004, India
| | - Amit Shelke
- Department of Civil Engineering, Indian Institute of Technology Guwahati, Assam 781039, India.
| | - Anowarul Habib
- Department of Physics and Technology, UiT The Arctic University of Norway, 9037 Tromsø, Norway.
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16
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Du H, Zhang X, Wang L, Chen F. Highly efficient, modal phase-matched second harmonic generation in a double-layered thin film lithium niobate waveguide. OPTICS EXPRESS 2023; 31:9713-9726. [PMID: 37157534 DOI: 10.1364/oe.482572] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
In this contribution, we numerically investigate second harmonic generation in double-layered lithium niobate on the insulator platform by means of the modal phase matching. The modal dispersion of the ridge waveguides at the C waveband of optical fiber communication is calculated numerically and analyzed. Modal phase matching can be achieved by changing the geometric dimensions of the ridge waveguide. The phase-matching wavelength and conversion efficiencies versus the geometric dimensions in the modal phase-matching process are investigated. We also analyze the thermal-tuning ability of the present modal phase matching scheme. Our results show that highly efficient second harmonic generation can be realized by the modal phase matching in the double-layered thin film lithium niobate ridge waveguide.
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17
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Boes A, Chang L, Langrock C, Yu M, Zhang M, Lin Q, Lončar M, Fejer M, Bowers J, Mitchell A. Lithium niobate photonics: Unlocking the electromagnetic spectrum. Science 2023; 379:eabj4396. [PMID: 36603073 DOI: 10.1126/science.abj4396] [Citation(s) in RCA: 45] [Impact Index Per Article: 45.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Lithium niobate (LN), first synthesized 70 years ago, has been widely used in diverse applications ranging from communications to quantum optics. These high-volume commercial applications have provided the economic means to establish a mature manufacturing and processing industry for high-quality LN crystals and wafers. Breakthrough science demonstrations to commercial products have been achieved owing to the ability of LN to generate and manipulate electromagnetic waves across a broad spectrum, from microwave to ultraviolet frequencies. Here, we provide a high-level Review of the history of LN as an optical material, its different photonic platforms, engineering concepts, spectral coverage, and essential applications before providing an outlook for the future of LN.
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Affiliation(s)
- Andreas Boes
- Integrated Photonics and Applications Centre (InPAC), School of Engineering, RMIT University, Melbourne, VIC 3000, Australia.,Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, Adelaide, SA 5005, Australia.,School of Electrical and Electronic Engineering, University of Adelaide, Adelaide, SA 5005, Australia
| | - Lin Chang
- State Key Laboratory of Advanced Optical Communications System and Networks, School of Electronics, Peking University, Beijing 100871, China.,Frontiers Science Center for Nano-optoelectronics, Peking University, Beijing 100871, China
| | - Carsten Langrock
- Edward L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA
| | - Mengjie Yu
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.,Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA 90089, USA
| | | | - Qiang Lin
- Department of Electrical and Computer Engineering, University of Rochester, Rochester, NY 14627, USA
| | - Marko Lončar
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Martin Fejer
- Edward L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA
| | - John Bowers
- Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA
| | - Arnan Mitchell
- Integrated Photonics and Applications Centre (InPAC), School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
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18
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Herter A, Shams-Ansari A, Settembrini FF, Warner HK, Faist J, Lončar M, Benea-Chelmus IC. Terahertz waveform synthesis in integrated thin-film lithium niobate platform. Nat Commun 2023; 14:11. [PMID: 36599838 DOI: 10.1038/s41467-022-35517-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 12/07/2022] [Indexed: 01/06/2023] Open
Abstract
Bridging the "terahertz gap" relies upon synthesizing arbitrary waveforms in the terahertz domain enabling applications that require both narrow band sources for sensing and few-cycle drives for classical and quantum objects. However, realization of custom-tailored waveforms needed for these applications is currently hindered due to limited flexibility for optical rectification of femtosecond pulses in bulk crystals. Here, we experimentally demonstrate that thin-film lithium niobate circuits provide a versatile solution for such waveform synthesis by combining the merits of complex integrated architectures, low-loss distribution of pump pulses on-chip, and an efficient optical rectification. Our distributed pulse phase-matching scheme grants shaping the temporal, spectral, phase, amplitude, and farfield characteristics of the emitted terahertz field through designer on-chip components. This strictly circumvents prior limitations caused by the phase-delay mismatch in conventional systems and relaxes the requirement for cumbersome spectral pre-engineering of the pumping light. We propose a toolbox of basic blocks that produce broadband emission up to 680 GHz and far-field amplitudes of a few V m-1 with adaptable phase and coherence properties by using near-infrared pump pulse energies below 100 pJ.
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Affiliation(s)
- Alexa Herter
- ETH Zurich, Institute of Quantum Electronics, Zurich, Switzerland.
| | - Amirhassan Shams-Ansari
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.
| | | | - Hana K Warner
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Jérôme Faist
- ETH Zurich, Institute of Quantum Electronics, Zurich, Switzerland
| | - Marko Lončar
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
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19
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Li X, Ma J, Liu S, Huang P, Chen B, Wei D, Liu J. Efficient second harmonic generation by harnessing bound states in the continuum in semi-nonlinear etchless lithium niobate waveguides. LIGHT, SCIENCE & APPLICATIONS 2022; 11:317. [PMID: 36316306 PMCID: PMC9622896 DOI: 10.1038/s41377-022-01017-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 10/08/2022] [Accepted: 10/12/2022] [Indexed: 05/16/2023]
Abstract
Integrated photonics provides unprecedented opportunities to pursue advanced nonlinear light sources with low-power consumptions and small footprints in a scalable manner, such as microcombs, chip-scale optical parametric oscillators and integrated quantum light sources. Among a variety of nonlinear optical processes, high-efficiency second harmonic generation (SHG) on-chip is particularly appealing and yet challenging. In this work, we present efficient SHG in highly engineerable semi-nonlinear waveguides consisting of electron-beam resist waveguides and thin-film silicon nitride (SiN)/lithium niobate (LN). By carefully designing octave-separating bound states in the continuum (BICs) for the nonlinear interacting waves in such a hybrid structure, we have simultaneously optimized the losses for both fundamental frequency (FF) and second harmonic (SH) waves and achieved modal phasing matching and maximized the nonlinear modal overlap between the FF and SH waves, which results in an experimental conversion efficiency up to 4.05% W-1cm-2. Our work provides a versatile and fabrication-friendly platform to explore on-chip nonlinear optical processes with high efficiency in the context of nanophotonics and quantum optics.
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Affiliation(s)
- Xueshi Li
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Jiantao Ma
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Shunfa Liu
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Peinian Huang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Bo Chen
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Dunzhao Wei
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China.
| | - Jin Liu
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China.
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20
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Fehrembach AL, Popov E, Hemsley E, Monmayrant A, Gauthier-Lafaye O, Calvez S. Cavity-resonator integrated bi-atom grating coupler for enhanced second-harmonic generation. OPTICS EXPRESS 2022; 30:38789-38803. [PMID: 36258436 DOI: 10.1364/oe.468683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 09/22/2022] [Indexed: 06/16/2023]
Abstract
We report on the design of cavity-resonator integrated grating couplers for second-harmonic generation. The key point is that the base pattern of our grating coupler (GC) is made of two ridges with different widths (bi-atom). Thus, we reach extremely high Q-factors (above 105) with structures whose fabrication is not challenging, since the bi-atom base pattern is close to that of the surrounded distributed Bragg reflectors (DBR). Yet, the parameters of the structure have to be chosen cautiously to reduce the transition losses between each section (GC, DBR). We numerically demonstrate conversion efficiencies η of several tenths per Watt, even doubled when we include a phase-matching grating within the structuration. Such efficiencies are comparable to those obtained with waveguides and nano-resonators.
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21
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Ding Y, Tao S, Wang X, Shang C, Pan A, Zeng C, Xia J. Thermo-optic tunable optical filters with GHz-bandwidth and flat-top passband on thin film lithium niobate platform. OPTICS EXPRESS 2022; 30:22135-22142. [PMID: 36224919 DOI: 10.1364/oe.458218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 05/24/2022] [Indexed: 06/16/2023]
Abstract
Lithium niobate on insulator (LNOI) is a new photonic integrated platform that provides high optical confinement and retains the inherent excellent properties of lithium niobate (LN). Tunable filters are one of the indispensable devices for integrated optics. Here we design and fabricate a thermo-optic (TO) tunable optical filter using two cascaded racetrack microring resonators (MRRs) based on LNOI. The filter shows a narrow and flat top passband with intra band ripple less than 0.3 dB, 3 dB bandwidth of 4.8 GHz and out-of-band rejection of about 35 dB. The insertion loss of the filter is about -14 dB, including grating coupling loss about -6.5 dB and on-chip loss less than -1 dB. The heating power for center wavelength shift of the filter is about 89.4 mW per free spectral range (FSR). Relevant applications of such filters include optical information processing and microwave photonics.
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22
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Wu X, Zhang L, Hao Z, Zhang R, Ma R, Bo F, Zhang G, Xu J. Broadband second-harmonic generation in step-chirped periodically poled lithium niobate waveguides. OPTICS LETTERS 2022; 47:1574-1577. [PMID: 35363681 DOI: 10.1364/ol.450547] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Accepted: 02/17/2022] [Indexed: 06/14/2023]
Abstract
Periodically poled lithium niobate (PPLN) structures on a chip enable efficient second-order nonlinear optical effects, benefiting from the tight light confinement and the utilization of d33. Here, we report a broadband second-harmonic (SH) generation in a step-chirped PPLN waveguide on X-cut lithium niobate on insulator (LNOI). The high fidelity of the poling period is demonstrated over the whole length of 7 mm using a non-destructive technique of piezoresponse force microscopy. The SH signal was continuously observed in the step-chirped PPLN waveguides while scanning the wavelength of the pump laser from 1550 nm to 1660 nm. The SH conversion efficiency was measured to be 9.6 % W-1 cm-2 at 1642 nm. This work will benefit wavelength conversions of light sources with wideband spectra.
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23
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On-Chip Optical Beam Manipulation with an Electrically Tunable Lithium-Niobate-on-Insulator Metasurface. MICROMACHINES 2022; 13:mi13030472. [PMID: 35334766 PMCID: PMC8950189 DOI: 10.3390/mi13030472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 03/14/2022] [Accepted: 03/16/2022] [Indexed: 02/04/2023]
Abstract
Photonic integrated circuits (PICs) have garnered increasing attention because of their high efficiency in information processing. Recently, lithium niobate on insulator (LNOI) has become a new platform for PICs with excellent properties. Several tunable devices such as on-chip tunable devices that utilize the electric-optic effect of LN have been reported. However, an on-chip electrically tunable beam modulator that can focus or deflect the wave has not yet been developed. In this study, we designed an electrically tunable LNOI metasurface for on-chip optical beam manipulation. With a carefully designed local phase profile, we realized the tunable focusing and reflection functions on the chip. As the bias voltage varies, the focusing length can be shifted up to 19.9 μm (~13λ), whereas the focusing efficiency remains greater than 72%. A continuously tunable deflection can also be achieved efficiently within a range of 0–45°. The beam modulator enhances the ability to manipulate light on LNOI chips, which is expected to promote the development of integrated on-chip photonics.
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24
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Lu C, Zhang Y, Qiu J, Tang Y, Ding T, Liu S, Zheng Y, Chen X. Highly tunable birefringent phase-matched second-harmonic generation in an angle-cut lithium niobate-on-insulator ridge waveguide. OPTICS LETTERS 2022; 47:1081-1084. [PMID: 35230295 DOI: 10.1364/ol.449634] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 01/17/2022] [Indexed: 06/14/2023]
Abstract
Phase-matched nonlinear wave mixing, e.g., second-harmonic generation (SHG), is crucial for frequency conversion for integrated photonics and applications, where phase matching wavelength tunability in a wide manner is important. Here, we propose and demonstrate a novel design of angle-cut ridge waveguides for SHG on the lithium niobate-on-insulator (LNOI) platform via type-I birefringent phase matching (BPM). The unique strong birefringence of LN is used to achieve flexible temperature tuning. We experimentally demonstrate a normalized BPM conversion efficiency of 2.7%W-1cm-2 in an angle-cut LN ridge waveguide with a thermo tuning slope of 1.06 nm/K at the telecommunication C band. The approach effectively overcomes the spatial walk-off effect and avoids the need for periodic domain engineering. Furthermore, the angle-cut ridge waveguide scheme can be universally extended to other on-chip birefringent platforms where domain engineering is difficult or immature. The approach may open up an avenue for tunable nonlinear frequency conversion on integrated photonics for broad applications.
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25
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Tang L, Tang J, Chen M, Nori F, Xiao M, Xia K. Quantum Squeezing Induced Optical Nonreciprocity. PHYSICAL REVIEW LETTERS 2022; 128:083604. [PMID: 35275662 DOI: 10.1103/physrevlett.128.083604] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
We propose an all-optical approach to achieve optical nonreciprocity on a chip by quantum squeezing one of two coupled resonator modes. By parametric pumping a χ^{(2)}-nonlinear resonator unidirectionally with a classical coherent field, we squeeze the resonator mode in a selective direction due to the phase-matching condition, and induce a chiral photon interaction between two resonators. Based on this chiral interresonator coupling, we achieve an all-optical diode and a three-port quasicirculator. By applying a second squeezed-vacuum field to the squeezed resonator mode, our nonreciprocal device also works for single-photon pulses. We obtain an isolation ratio of >40 dB for the diode and fidelity of >98% for the quasicirculator, and insertion loss of <1 dB for both. We also show that nonreciprocal transmission of strong light can be switched on and off by a relative weak pump light. This achievement implies a nonreciprocal optical transistor. Our protocol opens up a new route to achieve integrable all-optical nonreciprocal devices permitting chip-compatible optical isolation and nonreciporcal quantum information processing.
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Affiliation(s)
- Lei Tang
- College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Jiangshan Tang
- College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Mingyuan Chen
- College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Franco Nori
- RIKEN Quantum Computing Center, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama 351-0198, Japan
- Physics Department, The University of Michigan, Ann Arbor, Michigan 48109-1040, USA
| | - Min Xiao
- College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
| | - Keyu Xia
- College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
- Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing University, Nanjing 210023, China
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26
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Feng LT, Zhang M, Xiong X, Liu D, Cheng YJ, Jing FM, Qi XZ, Chen Y, He DY, Guo GP, Guo GC, Dai DX, Ren XF. Transverse Mode-Encoded Quantum Gate on a Silicon Photonic Chip. PHYSICAL REVIEW LETTERS 2022; 128:060501. [PMID: 35213196 DOI: 10.1103/physrevlett.128.060501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 01/25/2022] [Indexed: 06/14/2023]
Abstract
As an important degree of freedom (d.o.f.) in photonic integrated circuits, the orthogonal transverse mode provides a promising and flexible way to increase communication capability, for both classical and quantum information processing. To construct large-scale on-chip multimode multi-d.o.f.s quantum systems, a transverse mode-encoded controlled-NOT (CNOT) gate is necessary. Here, with the help of our new transverse mode-dependent directional coupler and attenuator, we demonstrate the first multimode implementation of a 2-qubit quantum gate. The ability of the gate is demonstrated by entangling two separated transverse mode qubits with an average fidelity of 0.89±0.02 and the achievement of 10 standard deviations of violations in the quantum nonlocality verification. In addition, a fidelity of 0.82±0.01 is obtained from quantum process tomography used to completely characterize the CNOT gate. Our work paves the way for universal transverse mode-encoded quantum operations and large-scale multimode multi-d.o.f.s quantum systems.
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Affiliation(s)
- Lan-Tian Feng
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Ming Zhang
- State Key Laboratory for Modern Optical Instrumentation, Centre for Optical and Electromagnetic Research, Zhejiang Provincial Key Laboratory for Sensing Technologies, Zhejiang University, Zijingang Campus, Hangzhou 310058, China
- Ningbo Research Institute, Zhejiang University, Ningbo 315100, China
| | - Xiao Xiong
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Di Liu
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Yu-Jie Cheng
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Fang-Ming Jing
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Xiao-Zhuo Qi
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Yang Chen
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - De-Yong He
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Guo-Ping Guo
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Guang-Can Guo
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Dao-Xin Dai
- State Key Laboratory for Modern Optical Instrumentation, Centre for Optical and Electromagnetic Research, Zhejiang Provincial Key Laboratory for Sensing Technologies, Zhejiang University, Zijingang Campus, Hangzhou 310058, China
- Ningbo Research Institute, Zhejiang University, Ningbo 315100, China
| | - Xi-Feng Ren
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
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27
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Kuo PS. Noncritical phasematching behavior in thin-film lithium niobate frequency converters. OPTICS LETTERS 2022; 47:54-57. [PMID: 34951881 PMCID: PMC9832586 DOI: 10.1364/ol.444846] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 11/29/2021] [Indexed: 06/10/2023]
Abstract
We present a study of noncritical phasematching behavior in thin-film, periodically poled lithium niobate (PPLN) waveguides. Noncritical phasematching refers to designing waveguides so that the phasematching is insensitive to variations in waveguide thickness, width, or other parameters. For waveguide thickness (the dimension with greatest nonuniformity due to fabrication), we found that phasematching sensitivity can be minimized but not eliminated. We estimate limits on the acceptable thickness variation and discuss scaling with device length for second-harmonic generation and sum-frequency generation in thin-film PPLN frequency converters.
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28
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Yuan S, Wu Y, Dang Z, Zeng C, Qi X, Guo G, Ren X, Xia J. Strongly Enhanced Second Harmonic Generation in a Thin Film Lithium Niobate Heterostructure Cavity. PHYSICAL REVIEW LETTERS 2021; 127:153901. [PMID: 34678011 DOI: 10.1103/physrevlett.127.153901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 08/31/2021] [Indexed: 06/13/2023]
Abstract
Boosting second-order optical nonlinear frequency conversion over subwavelength thickness has long been pursued through optical resonance in micro- and nanophotonics. However, the availability of thin film materials with high second-order nonlinearity is limited to III-V semiconductors, which have low transparency in the visible. Here, we experimentally demonstrated strongly enhanced second harmonic generation in one-dimensional heterostructure cavities on thin film lithium niobate. A guided-mode resonance resonator and distributed Bragg reflectors are combined for both efficient coupling and electromagnetic field localization. Over 1200 times second harmonic generation enhancement is experimentally realized compared with flat thin film lithium niobate through optimizing the trade-off between quality factor and mode volume, leading to a record high normalized conversion efficiency of 2.03×10^{-5} cm^{2}/GW under 1.92 MW/cm^{2} pump intensity. Our approach could inspire the miniaturization and integration of compact resonant nonlinear photonic devices on thin film lithium niobate.
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Affiliation(s)
- Shuai Yuan
- Wuhan National laboratory of Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yunkun Wu
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Zhongzhou Dang
- Wuhan National laboratory of Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Cheng Zeng
- Wuhan National laboratory of Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Xiaozhuo Qi
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Guangcan Guo
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xifeng Ren
- Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
- Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jinsong Xia
- Wuhan National laboratory of Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
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Lomonte E, Lenzini F, Pernice WHP. Efficient self-imaging grating couplers on a lithium-niobate-on-insulator platform at near-visible and telecom wavelengths. OPTICS EXPRESS 2021; 29:20205-20216. [PMID: 34266114 DOI: 10.1364/oe.428138] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 05/26/2021] [Indexed: 06/13/2023]
Abstract
Lithium-niobate-on-insulator (LNOI) has emerged as a promising platform in the field of integrated photonics. Nonlinear optical processes and fast electro-optic modulation have been reported with outstanding performance in ultra-low loss waveguides. In order to harness the advantages offered by the LNOI technology, suitable fiber-to-chip interconnects operating at different wavelength ranges are demanded. Here we present easily manufacturable, self-imaging apodized grating couplers, featuring a coupling efficiency of the TE0 mode as high as ≃47.1% at λ=1550 nm and ≃44.9% at λ=775 nm. Our approach avoids the use of any metal back-reflector for an improved directivity or multi-layer structures for an enhanced grating strength.
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30
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Anthur AP, Zhang H, Akimov Y, Rong Ong J, Kalashnikov D, Kuznetsov AI, Krivitsky L. Second harmonic generation in gallium phosphide nano-waveguides. OPTICS EXPRESS 2021; 29:10307-10320. [PMID: 33820169 DOI: 10.1364/oe.409758] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 12/14/2020] [Indexed: 06/12/2023]
Abstract
We designed, fabricated and tested gallium phosphide (GaP) nano-waveguides for second harmonic generation (SHG). We demonstrate SHG in the visible range around 655 nm using modal phase matching. We observe phase matched SHG for different combinations of interacting modes by varying the widths of the waveguides and tuning the wavelength of the pump. We achieved a normalized internal SHG conversion efficiency of 0.4% W-1cm-2 for a continuous-wave pump at wavelength of 1283.5 nm, the highest reported in the literature for a GaP waveguide. We also demonstrated temperature tuning of the SHG wavelength with a slope of 0.17 nm/°C. The presented results contribute to the development of integrated photonic platforms with efficient nonlinear wave-mixing processes for classical and quantum applications.
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31
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Ma J, Xi X, Sun X. Experimental Demonstration of Dual-Band Nano-Electromechanical Valley-Hall Topological Metamaterials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2006521. [PMID: 33538079 DOI: 10.1002/adma.202006521] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 12/13/2020] [Indexed: 06/12/2023]
Abstract
Suppression of undesired backscattering of very-high-frequency elastic signals has been considered as a grand challenge in integrated phononic circuits. Originating from condensed-matter physics, valley-Hall topological insulators provide an intriguing strategy to overcome this challenge. To date, phononic valley-Hall topological insulators have been demonstrated only in bulk acoustic and mechanical systems operating at relatively low frequencies. Here, an integrated nano-electromechanical valley-Hall topological insulator operating in the very-high-frequency regime is experimentally realized. Valley kink states that are backscattering-immune against sharp bends and exhibit the "valley-momentum locking" effect simultaneously in the fundamental (≈60 MHz) and second-order (≈120 MHz) frequency bands are demonstrated. It is further shown that the propagation directions of these dual-band valley kink states are always locked to their valley pseudospins. The results not only enable various applications in very-high-frequency integrated phononic circuits with enhanced robustness and capacity, but also open the door to experimental exploration of mechanical nonlinearities, particularly those involving the fundamental and second-order frequencies, in topologically nontrivial nanostructures.
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Affiliation(s)
- Jingwen Ma
- Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
| | - Xiang Xi
- Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
| | - Xiankai Sun
- Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
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32
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Xu Y, Shen M, Lu J, Surya JB, Sayem AA, Tang HX. Mitigating photorefractive effect in thin-film lithium niobate microring resonators. OPTICS EXPRESS 2021; 29:5497-5504. [PMID: 33726085 DOI: 10.1364/oe.418877] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 01/21/2021] [Indexed: 06/12/2023]
Abstract
Thin-film lithium niobate is an attractive integrated photonics platform due to its low optical loss and favorable optical nonlinear and electro-optic properties. However, in applications such as second harmonic generation, frequency comb generation, and microwave-to-optics conversion, the device performance is strongly impeded by the photorefractive effect inherent in thin-film lithium niobate. In this paper, we show that the dielectric cladding on a lithium niobate microring resonator has a significant influence on the photorefractive effect. By removing the dielectric cladding layer, the photorefractive effect in lithium niobate ring resonators can be effectively mitigated. Our work presents a reliable approach to control the photorefractive effect on thin-film lithium niobate and will further advance the performance of integrated classical and quantum photonic devices based on thin-film lithium niobate.
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Xu Y, Sayem AA, Zou CL, Fan L, Cheng R, Tang HX. Photorefraction-induced Bragg scattering in cryogenic lithium niobate ring resonators. OPTICS LETTERS 2021; 46:432-435. [PMID: 33449046 DOI: 10.1364/ol.414702] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 12/22/2020] [Indexed: 06/12/2023]
Abstract
We report intracavity Bragg scattering induced by the photorefractive (PR) effect in high-Q lithium niobate ring resonators at cryogenic temperatures. We show that when a cavity mode is strongly excited, the PR effect imprints a long-lived periodic space-charge field. This residual field in turn creates a refractive index modulation pattern that dramatically enhances the back scattering of an incoming probe light, and results in selective and reconfigurable mode splittings. This PR-induced Bragg scattering effect, despite being undesired for many applications, could be utilized to enable optically programmable photonic components.
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34
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Sun D, Zhang Y, Wang D, Song W, Liu X, Pang J, Geng D, Sang Y, Liu H. Microstructure and domain engineering of lithium niobate crystal films for integrated photonic applications. LIGHT, SCIENCE & APPLICATIONS 2020; 9:197. [PMID: 33303741 PMCID: PMC7729400 DOI: 10.1038/s41377-020-00434-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Revised: 11/08/2020] [Accepted: 11/12/2020] [Indexed: 05/20/2023]
Abstract
Recently, integrated photonics has attracted considerable interest owing to its wide application in optical communication and quantum technologies. Among the numerous photonic materials, lithium niobate film on insulator (LNOI) has become a promising photonic platform owing to its electro-optic and nonlinear optical properties along with ultralow-loss and high-confinement nanophotonic lithium niobate waveguides fabricated by the complementary metal-oxide-semiconductor (CMOS)-compatible microstructure engineering of LNOI. Furthermore, ferroelectric domain engineering in combination with nanophotonic waveguides on LNOI is gradually accelerating the development of integrated nonlinear photonics, which will play an important role in quantum technologies because of its ability to be integrated with the generation, processing, and auxiliary detection of the quantum states of light. Herein, we review the recent progress in CMOS-compatible microstructure engineering and domain engineering of LNOI for integrated lithium niobate photonics involving photonic modulation and nonlinear photonics. We believe that the great progress in integrated photonics on LNOI will lead to a new generation of techniques. Thus, there remains an urgent need for efficient methods for the preparation of LNOI that are suitable for large-scale and low-cost manufacturing of integrated photonic devices and systems.
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Affiliation(s)
- Dehui Sun
- Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong, Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan, 250022, China.
| | - Yunwu Zhang
- Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong, Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan, 250022, China
| | - Dongzhou Wang
- Jinan Institute of Quantum Technology, Jinan, 250101, China
| | - Wei Song
- CETC Deqing Huaying Electronics Co., Ltd., Huzhou, 313200, China
| | - Xiaoyan Liu
- Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong, Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan, 250022, China
| | - Jinbo Pang
- Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong, Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan, 250022, China
| | - Deqiang Geng
- Crystrong Photoelectric Technology Co., Ltd., Jinan, 250100, China
| | - Yuanhua Sang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Hong Liu
- Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong, Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan, 250022, China.
- Jinan Institute of Quantum Technology, Jinan, 250101, China.
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China.
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35
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Fedotova A, Younesi M, Sautter J, Vaskin A, Löchner FJF, Steinert M, Geiss R, Pertsch T, Staude I, Setzpfandt F. Second-Harmonic Generation in Resonant Nonlinear Metasurfaces Based on Lithium Niobate. NANO LETTERS 2020; 20:8608-8614. [PMID: 33180501 DOI: 10.1021/acs.nanolett.0c03290] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Lithium niobate is an excellent and widely used material for nonlinear frequency conversion due to its strong optical nonlinearity and broad transparency region. Here, we report the fabrication and experimental investigation of resonant nonlinear metasurfaces for second-harmonic generation based on thin-film lithium niobate. In the fabricated metasurfaces, we observe pronounced Mie-type resonances leading to enhanced second-harmonic generation in the direction normal to the metasurface. We find the largest second-harmonic generation efficiency for the resonance dominated by the electric contributions because its specific field distribution enables the most efficient usage of the largest element of the lithium niobate nonlinear susceptibility tensor. This is confirmed by polarization-resolved second-harmonic measurements, where we study contributions from different elements of the nonlinear susceptibility tensor to the total second-harmonic signal. Our work facilitates establishing lithium niobate as a material for resonant nanophotonics.
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Affiliation(s)
- Anna Fedotova
- Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany
| | - Mohammadreza Younesi
- Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany
| | - Jürgen Sautter
- Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany
| | - Aleksandr Vaskin
- Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany
| | - Franz J F Löchner
- Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany
| | - Michael Steinert
- Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany
| | - Reinhard Geiss
- Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany
| | - Thomas Pertsch
- Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany
- Fraunhofer Institute of Applied Optics and Precision Engineering, 07745 Jena, Germany
| | - Isabelle Staude
- Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany
| | - Frank Setzpfandt
- Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany
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Li Z, Corbett B, Gocalinska A, Pelucchi E, Chen W, Ryan KM, Khan P, Silien C, Xu H, Liu N. Direct visualization of phase-matched efficient second harmonic and broadband sum frequency generation in hybrid plasmonic nanostructures. LIGHT, SCIENCE & APPLICATIONS 2020; 9:180. [PMID: 33110598 PMCID: PMC7582155 DOI: 10.1038/s41377-020-00414-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 09/09/2020] [Accepted: 09/28/2020] [Indexed: 06/11/2023]
Abstract
Second harmonic generation and sum frequency generation (SHG and SFG) provide effective means to realize coherent light at desired frequencies when lasing is not easily achievable. They have found applications from sensing to quantum optics and are of particular interest for integrated photonics at communication wavelengths. Decreasing the footprints of nonlinear components while maintaining their high up-conversion efficiency remains a challenge in the miniaturization of integrated photonics. Here we explore lithographically defined AlGaInP nano(micro)structures/Al2O3/Ag as a versatile platform to achieve efficient SHG/SFG in both waveguide and resonant cavity configurations in both narrow- and broadband infrared (IR) wavelength regimes (1300-1600 nm). The effective excitation of highly confined hybrid plasmonic modes at fundamental wavelengths allows efficient SHG/SFG to be achieved in a waveguide of a cross-section of 113 nm × 250 nm, with a mode area on the deep subwavelength scale (λ 2/135) at fundamental wavelengths. Remarkably, we demonstrate direct visualization of SHG/SFG phase-matching evolution in the waveguides. This together with mode analysis highlights the origin of the improved SHG/SFG efficiency. We also demonstrate strongly enhanced SFG with a broadband IR source by exploiting multiple coherent SFG processes on 1 µm diameter AlGaInP disks/Al2O3/Ag with a conversion efficiency of 14.8% MW-1 which is five times the SHG value using the narrowband IR source. In both configurations, the hybrid plasmonic structures exhibit >1000 enhancement in the nonlinear conversion efficiency compared to their photonic counterparts. Our results manifest the potential of developing such nanoscale hybrid plasmonic devices for state-of-the-art on-chip nonlinear optics applications.
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Affiliation(s)
- Zhe Li
- Department of Physics and Bernal Institute, University of Limerick, Limerick, Ireland
- The School of Physics and Technology, Institute for Advanced Studies and Center for Nanoscience and Nanotechnology, Wuhan University, Wuhan, 430072 China
| | - Brian Corbett
- Tyndall National Institute, University College Cork, Cork, Ireland
| | | | | | - Wen Chen
- Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH, 1015 Lausanne, Switzerland
| | - Kevin. M. Ryan
- Department of Chemical Sciences and Bernal Institute, University of Limerick, Limerick, Ireland
| | - Pritam Khan
- Department of Physics and Bernal Institute, University of Limerick, Limerick, Ireland
| | - Christophe Silien
- Department of Physics and Bernal Institute, University of Limerick, Limerick, Ireland
| | - Hongxing Xu
- The School of Physics and Technology, Institute for Advanced Studies and Center for Nanoscience and Nanotechnology, Wuhan University, Wuhan, 430072 China
| | - Ning Liu
- Department of Physics and Bernal Institute, University of Limerick, Limerick, Ireland
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37
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Nano-Domains Produced through a Two-Step Poling Technique in Lithium Niobate on Insulators. MATERIALS 2020; 13:ma13163617. [PMID: 32824285 PMCID: PMC7475902 DOI: 10.3390/ma13163617] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 08/02/2020] [Accepted: 08/14/2020] [Indexed: 11/17/2022]
Abstract
We proposed a two-step poling technique to fabricate nanoscale domains based on the anti-parallel polarization reversal effect in lithium niobate on insulator (LNOI). The anti-parallel polarization reversal is observed when lithium niobate thin film in LNOI is poled by applying a high voltage pulse through the conductive probe tip of atomic force microscope, which generates a donut-shaped domain structure with its domain polarization at the center being anti-parallel to the poling field. The donut-shaped domain is unstable and decays with a time scale of hours. With the two-step poling technique, the polarization of the donut-shaped domain can be reversed entirely, producing a stable dot domain with a size of tens of nanometers. Dot domains with diameter of the order of ∼30 nm were fabricated through the two-step poling technique. The results may be beneficial to domain-based applications such as ferroelectric domain memory.
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38
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Heuck M, Jacobs K, Englund DR. Controlled-Phase Gate Using Dynamically Coupled Cavities and Optical Nonlinearities. PHYSICAL REVIEW LETTERS 2020; 124:160501. [PMID: 32383940 DOI: 10.1103/physrevlett.124.160501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 03/13/2020] [Indexed: 06/11/2023]
Abstract
We show that relatively simple integrated photonic circuits have the potential to realize a high fidelity deterministic controlled-phase gate between photonic qubits using bulk optical nonlinearities. The gate is enabled by converting travelling continuous-mode photons into stationary cavity modes using strong classical control fields that dynamically change the effective cavity-waveguide coupling rate. This architecture succeeds because it reduces the wave packet distortions that otherwise accompany the action of optical nonlinearities [J. Shapiro, Phys. Rev. A 73, 062305 (2006)PLRAAN1050-294710.1103/PhysRevA.73.062305; J. Gea-Banacloche, Phys. Rev. A 81, 043823 (2010)PLRAAN1050-294710.1103/PhysRevA.81.043823]. We show that high-fidelity gates can be achieved with self-phase modulation in χ^{(3)} materials as well as second-harmonic generation in χ^{(2)} materials. The gate fidelity asymptotically approaches unity with increasing storage time for an incident photon wave packet with fixed duration. We also show that dynamically coupled cavities enable a trade-off between errors due to loss and wave packet distortion. Our proposed architecture represents a new approach to practical implementation of quantum gates that is room-temperature compatible and only relies on components that have been individually demonstrated.
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Affiliation(s)
- Mikkel Heuck
- DTU Fotonik, Technical University of Denmark, Building 343, 2800 Kongens Lyngby, Denmark
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
| | - Kurt Jacobs
- U.S. Army Research Laboratory, Computational and Information Sciences Directorate, Adelphi, Maryland 20783, USA
- Department of Physics, University of Massachusetts at Boston, Boston, Massachusetts 02125, USA
- Hearne Institute for Theoretical Physics, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Dirk R Englund
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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Xu H, Dai D, Liu L, Shi Y. Proposal for an ultra-broadband polarization beam splitter using an anisotropy-engineered Mach-Zehnder interferometer on the x-cut lithium-niobate-on-insulator. OPTICS EXPRESS 2020; 28:10899-10908. [PMID: 32403611 DOI: 10.1364/oe.390075] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 03/24/2020] [Indexed: 06/11/2023]
Abstract
We propose and theoretically demonstrate an integrated polarization beam splitter on the x-cut lithium-niobate-on-insulator (LNOI) platform. The device is based on a Mach-Zehnder interferometer with an anisotropy-engineered multi-section phase shifter. The phase shift can be simultaneously controlled for the TE and TM polarizations by engineering the length and direction of the anisotropic LNOI waveguide. For TE polarization, the phase shift is -π/2, while for TM polarization, the phase shift is π/2. Thus, the incident TE and TM modes can be coupled into different output ports. The simulation results show an ultra-high polarization extinction ratio of ∼47.7 dB, a low excess loss of ∼0.9 dB and an ultra-broad working bandwidth of ∼200 nm. To the best of our knowledge, the proposed structure is the first integrated polarization beam splitter on the x-cut LNOI platform.
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40
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Carnio BN, Elezzabi AY. Theoretical formalism for off-normal angular coupling into selective and parity-dependent modes in a planar waveguide. OPTICS LETTERS 2020; 45:948-951. [PMID: 32058514 DOI: 10.1364/ol.381569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 01/07/2020] [Indexed: 06/10/2023]
Abstract
A theoretical formalism is presented to describe coupling of an electromagnetic field into the modes of a planar waveguide, where the electromagnetic field has a non-uniform transverse profile and is incident at an arbitrary angle. The theoretical approach is used to investigate coupling of a Gaussian electromagnetic field into a ${{\rm LiNbO}_3}$LiNbO3 planar waveguide, where the calculations are shown to be in excellent agreement with finite-different time-domain simulations. This formalism is essential to phase-matched frequency-conversion waveguides based on nonlinear optical phenomena, which can rely on coupling the excitation field into selective higher-order waveguide modes of either even or odd parity.
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Abstract
We present a simple and effective way to improve the thermal stability of nano-domains written with an atomic force microscope (AFM)-tip voltage in a lithium niobate film on insulator (LNOI). We show that nano-domains in LNOI (whether in the form of stripe domains or dot domains) degraded, or even disappeared, after a post-poling thermal annealing treatment at a temperature on the order of ∼100 ∘ C. We experimentally confirmed that the thermal stability of nano-domains in LNOI is greatly improved if a pre-heat treatment is carried out for LNOI before the nano-domains are written. This thermal stability improvement of nano-domains is mainly attributed to the generation of a compensating space charge field parallel to the spontaneous polarization of written nano-domains during the pre-heat treatment process.
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Zhou YH, Zhang XY, Dan Zou D, Wu QC, Ling Ye B, Fang YL, Shen HZ, Yang CP. Controllable scattering of a single photon inside a one-dimensional coupled resonator waveguide with second-order nonlinearity. OPTICS EXPRESS 2020; 28:1249-1260. [PMID: 32121839 DOI: 10.1364/oe.380250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 12/11/2019] [Indexed: 06/10/2023]
Abstract
We note that most of the studies of the single photon scattering inside a one-dimensional coupled resonator waveguide are based on the waveguide coupling with the atom systems. In this paper, we will study the single photon scattering enabled by another system, i.e., the second-order nonlinearity, which can act as a single photon switch to control the single photon transmission and reflection inside the one-dimensional coupled resonator waveguide. The transmission rate is calculated to analyze the single-photon scattering properties. In addition, a more complicated second-order nonlinear form, i.e., three-wave mixing, is discussed to control single photon transmission inside the one-dimensional coupled resonator waveguide.
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Kong Y, Bo F, Wang W, Zheng D, Liu H, Zhang G, Rupp R, Xu J. Recent Progress in Lithium Niobate: Optical Damage, Defect Simulation, and On-Chip Devices. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1806452. [PMID: 31282003 DOI: 10.1002/adma.201806452] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 05/06/2019] [Indexed: 05/14/2023]
Abstract
Lithium niobate (LN) is one of the most important synthetic crystals. In the past two decades, many breakthroughs have been made in material technology, theoretical understanding, and application of LN crystals. Recent progress in optical damage, defect simulation, and on-chip devices of LN are explored. Optical damage is one of the main obstacles for the practical usage of LN crystals. Recent results reveal that doping with ZrO2 not only leads to better optical damage resistance in the visible but also improves resistance in the ultraviolet region. It is still awkward to extract defect characteristics and their relationship with the physical properties of LN crystals directly from experimental investigations. Recent simulations provide detailed descriptions of intrinsic defect models, the site occupation of dopants and the variation of energy levels due to extrinsic defects. LN is considered to be one of the most promising platforms for integrated photonics. Benefiting from advances in smart-cut, direct wafer bonding and layer transfer techniques, great progress has been made in the past decade for LNs on insulators. Recent progress on on-chip LN micro-photonic devices and nonlinear optical effects, in particular photorefractive effects, are briefly reviewed.
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Affiliation(s)
- Yongfa Kong
- School of Physics, Nankai University, Tianjin, 300071, China
- MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Institute of Applied Physics, Nankai University, Tianjin, 300457, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China
| | - Fang Bo
- MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Institute of Applied Physics, Nankai University, Tianjin, 300457, China
| | - Weiwei Wang
- School of Physics, Nankai University, Tianjin, 300071, China
| | - Dahuai Zheng
- MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Institute of Applied Physics, Nankai University, Tianjin, 300457, China
| | - Hongde Liu
- School of Physics, Nankai University, Tianjin, 300071, China
| | - Guoquan Zhang
- School of Physics, Nankai University, Tianjin, 300071, China
- MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Institute of Applied Physics, Nankai University, Tianjin, 300457, China
| | - Romano Rupp
- Faculty of Physics, Vienna University, A-1090, Wien, Austria
- J. Stefan Institute, Jamova 39, SI-1000, Ljubljana, Slovenia
| | - Jingjun Xu
- School of Physics, Nankai University, Tianjin, 300071, China
- MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Institute of Applied Physics, Nankai University, Tianjin, 300457, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China
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Zhang L, Zheng D, Li W, Bo F, Gao F, Kong Y, Zhang G, Xu J. Microdisk resonators with lithium-niobate film on silicon substrate. OPTICS EXPRESS 2019; 27:33662-33669. [PMID: 31878429 DOI: 10.1364/oe.27.033662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 10/09/2019] [Indexed: 06/10/2023]
Abstract
In this paper, we report the fabrication of lithium niobate (LN) microdisk resonators on a pulsed-laser deposited polycrystalline LN film on a silicon substrate rather than commercially provide LN film on insulator. The quality factor of these polycrystalline LN microdisks were measured above 3.4×104 in the 1550-nm band. Second harmonic generation was demonstrated in the fabricated microresonators. Because the properties of homemade LN film can be easily tuned by doping various ions, LN devices on homemade LN film may have more flexible functions and broad applications.
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45
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Carletti L, Li C, Sautter J, Staude I, De Angelis C, Li T, Neshev DN. Second harmonic generation in monolithic lithium niobate metasurfaces. OPTICS EXPRESS 2019; 27:33391-33398. [PMID: 31878409 DOI: 10.1364/oe.27.033391] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 10/21/2019] [Indexed: 06/10/2023]
Abstract
Second-order nonlinear metasurfaces have proven their ability to efficiently convert the frequency of incident signals over subwavelength thickness. However, the availability of second-order nonlinear materials for such metasurfaces has so far been limited to III-V semiconductors, which have low transparency in the visible and impose constraints on the excitation geometries due to the lack of diagonal second-order susceptibility components. Here we propose a new design concept for second-order nonlinear metasurfaces on a monolithic substrate, which is not limited by the availability of thin crystalline films and can be applied to any non-centrosymmetric material. We exemplify this concept in a monolithic Lithium Niobate metasurface with cylinder-shaped corrugations for enhanced field confinement. By optimizing the geometrical parameters, we show enhanced second harmonic generation from a near-infrared pump beam with conversion efficiency above 10-5 using 1 GW/cm2 pump intensity. Our approach enables new opportunities for practical designs of generic metasurfaces for nonlinear and quantum light sources.
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Renaud F, Monmayrant A, Calvez S, Gauthier-Lafaye O, Fehrembach AL, Popov E. Second-harmonic-generation enhancement in cavity resonator integrated grating filters. OPTICS LETTERS 2019; 44:5198-5201. [PMID: 31674967 DOI: 10.1364/ol.44.005198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Accepted: 09/27/2019] [Indexed: 06/10/2023]
Abstract
We demonstrate numerically and experimentally second-harmonic generation (SHG) in a cavity resonator integrated grating filter (CRIGF, a planar cavity resonator made of Bragg grating reflectors) around 1550 nm. SHG is modeled numerically for several different systems, including a thin plane layer of LiNbO3 without and with a grating coupler to excite a waveguide mode. We demonstrate that when the waveguide mode is confined to a CRIGF, designed to work with focused incident beams, the SHG power is increased more than 30 times, compared to the case of a single grating coupler used with an almost collimated pump beam.
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Boes A, Chang L, Knoerzer M, Nguyen TG, Peters JD, Bowers JE, Mitchell A. Improved second harmonic performance in periodically poled LNOI waveguides through engineering of lateral leakage. OPTICS EXPRESS 2019; 27:23919-23928. [PMID: 31510289 DOI: 10.1364/oe.27.023919] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 07/29/2019] [Indexed: 06/10/2023]
Abstract
In this contribution, we investigate the impact of lateral leakage for linear and nonlinear optical waveguides in lithium niobate on an insulator (LNOI). Silicon nitride (SiN) loaded and direct patterned lithium niobate cross-sections are investigated. We show that lateral leakage can take place for the TE mode in LNOI ridge waveguides (X-cut lithium niobate), due to the birefringence of the material. This work gives guidelines for designing waveguides in LNOI that do not suffer from the lateral leakage effect. By applying these design considerations, we avoided the lateral leakage effect at the second harmonic wavelength of a nonlinear optical waveguide in LNOI and demonstrate a peak second harmonic generation conversion efficiency of ~1160% W-1cm-2.
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Triplett M, Khaydarov J, Xu X, Marandi A, Imeshev G, Arntsen J, Ninan A, Miller G, Langrock C. Multi-watt, broadband second-harmonic-generation in MgO:PPSLT waveguides fabricated with femtosecond laser micromachining. OPTICS EXPRESS 2019; 27:21102-21115. [PMID: 31510193 DOI: 10.1364/oe.27.021102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 06/20/2019] [Indexed: 06/10/2023]
Abstract
We demonstrate optical waveguides fabricated in periodically poled MgO-doped stoichiometric lithium tantalate crystals using an fs-laser direct-write process. Two different waveguide architectures were developed: depressed cladding and stress-induced waveguides. Our strain-optic simulations confirmed the guiding mechanism for either case. We demonstrate designs optimized for low propagation loss (0.52 dB/cm) for both fundamental (1050 nm) and second-harmonic wavelengths (525 nm). Low-power CW second-harmonic-generation studies show normalized efficiencies comparable to that of annealed reverse-proton-exchange waveguides in lithium niobate. High-power studies demonstrate second-harmonic power levels up to 8.5 W in a single-pass configuration, using a 1-nm bandwidth CW IR fiber laser as a pump.
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Jian J, Xu M, Liu L, Luo Y, Zhang J, Liu L, Zhou L, Chen H, Yu S, Cai X. High modulation efficiency lithium niobate Michelson interferometer modulator. OPTICS EXPRESS 2019; 27:18731-18739. [PMID: 31252810 DOI: 10.1364/oe.27.018731] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 06/13/2019] [Indexed: 06/09/2023]
Abstract
We demonstrate highly efficient lithium niobate thin film Michelson interferometer modulators with half-wave voltage length product of 1.4 V∙cm. Amorphous silicon grating couplers have been incorporated to achieve a 3.8-dB/port waveguide-fiber coupling loss. Devices with 1-mm phase shifter arms have a footprint of 2.5 mm × 1.7 mm. The demonstrated modulation data rates is up to 35 Gb/s.
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Jian J, Xu P, Chen H, He M, Wu Z, Zhou L, Liu L, Yang C, Yu S. High-efficiency hybrid amorphous silicon grating couplers for sub-micron-sized lithium niobate waveguides. OPTICS EXPRESS 2018; 26:29651-29658. [PMID: 30469926 DOI: 10.1364/oe.26.029651] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 10/08/2018] [Indexed: 06/09/2023]
Abstract
We demonstrate hybrid amorphous silicon uniform grating couplers for efficient coupling between the standard single-mode fiber and sub-micron lithium niobate waveguides. The grating couplers exhibit coupling efficiency of -3.06 dB and 1-dB bandwidth of 55 nm. The amorphous silicon grating couplers can also provide a universal building block applicable to other photonic platforms such as silicon nitride waveguides, whose moderate refractive index values prevent high efficiency grating couplers to be fabricated in the native waveguide.
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