1
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Xu R, Crassee I, Bechtel HA, Zhou Y, Bercher A, Korosec L, Rischau CW, Teyssier J, Crust KJ, Lee Y, Gilbert Corder SN, Li J, Dionne JA, Hwang HY, Kuzmenko AB, Liu Y. Highly confined epsilon-near-zero and surface phonon polaritons in SrTiO 3 membranes. Nat Commun 2024; 15:4743. [PMID: 38834672 DOI: 10.1038/s41467-024-47917-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 04/12/2024] [Indexed: 06/06/2024] Open
Abstract
Recent theoretical studies have suggested that transition metal perovskite oxide membranes can enable surface phonon polaritons in the infrared range with low loss and much stronger subwavelength confinement than bulk crystals. Such modes, however, have not been experimentally observed so far. Here, using a combination of far-field Fourier-transform infrared (FTIR) spectroscopy and near-field synchrotron infrared nanospectroscopy (SINS) imaging, we study the phonon polaritons in a 100 nm thick freestanding crystalline membrane of SrTiO3 transferred on metallic and dielectric substrates. We observe a symmetric-antisymmetric mode splitting giving rise to epsilon-near-zero and Berreman modes as well as highly confined (by a factor of 10) propagating phonon polaritons, both of which result from the deep-subwavelength thickness of the membranes. Theoretical modeling based on the analytical finite-dipole model and numerical finite-difference methods fully corroborate the experimental results. Our work reveals the potential of oxide membranes as a promising platform for infrared photonics and polaritonics.
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Affiliation(s)
- Ruijuan Xu
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27606, USA
| | - Iris Crassee
- Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland
| | - Hans A Bechtel
- Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Yixi Zhou
- Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland
- Beijing Key Laboratory of Nano-Photonics and Nano-Structure (NPNS), Department of Physics, Capital Normal University, Beijing, China
| | - Adrien Bercher
- Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland
| | - Lukas Korosec
- Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland
| | - Carl Willem Rischau
- Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland
| | - Jérémie Teyssier
- Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland
| | - Kevin J Crust
- Department of Physics, Stanford University, Stanford, CA, 94305, USA
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Yonghun Lee
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
- Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA
| | | | - Jiarui Li
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
- Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA
| | - Jennifer A Dionne
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Harold Y Hwang
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
- Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA
| | - Alexey B Kuzmenko
- Department of Quantum Matter Physics, University of Geneva, 1211, Geneva, Switzerland.
| | - Yin Liu
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27606, USA.
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2
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Pistore V, Viti L, Schiattarella C, Wang Z, Law S, Mitrofanov O, Vitiello MS. Holographic Nano-Imaging of Terahertz Dirac Plasmon Polaritons in Topological Insulator Antenna Resonators. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308116. [PMID: 38152928 DOI: 10.1002/smll.202308116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 11/17/2023] [Indexed: 12/29/2023]
Abstract
Excitation of Dirac plasmon polaritons (DPPs) in bi-dimensional materials have attracted considerable interest in recent years, both from perspectives of understanding their physics and exploring their transformative potential for nanophotonic devices, including ultra-sensitive plasmonic sensors, ultrafast saturable absorbers, modulators, and switches. Topological insulators (TIs) represent an ideal technological platform in this respect because they can support plasmon polaritons formed by Dirac carriers in the topological surface states. Tracing propagation of DPPs is a very challenging task, particularly at terahertz (THz) frequencies, where the DPP wavelength becomes over one order of magnitude shorter than the free space photon wavelength. Furthermore, severe attenuation hinders the comprehensive analysis of their characteristics. Here, the properties of DPPs in real TI-based devices are revealed. Bi2Se3 rectangular antennas can efficiently confine the propagation of DPPs to a single dimension and, as a result, enhance the DPPs visibility despite the strong intrinsic attenuation. The plasmon dispersion and loss properties from plasmon profiles are experimentally determined, along the antennas, obtained using holographic near-field nano-imaging in a wide range of THz frequencies, from 2.05 to 4.3 THz. The detailed investigation of the unveiled DPP properties can guide the design of novel topological quantum devices exploiting their directional propagation.
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Affiliation(s)
- Valentino Pistore
- NEST, CNR-Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa, 56127, Italy
| | - Leonardo Viti
- NEST, CNR-Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa, 56127, Italy
| | - Chiara Schiattarella
- NEST, CNR-Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa, 56127, Italy
| | - Zhengtianye Wang
- Department of Materials Science and Engineering, University of Delaware, Newark, DE, 19716, USA
| | - Stephanie Law
- Materials Science and Engineering, Pennsylvania State University, University Park, PA, 16802, USA
| | - Oleg Mitrofanov
- University College London, Electronic and Electrical Engineering, London, WC1E 7JE, UK
| | - Miriam S Vitiello
- NEST, CNR-Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa, 56127, Italy
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3
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Yang Z, Li D, Chen L, Qiu F, Yan S, Tang M, Wang C, Wang L, Luo Y, Sun F, Han J, Fan C, Li J, Wang H. Near-Field Terahertz Morphological Reconstruction Nanoscopy for Subsurface Imaging of Protein Layers. ACS NANO 2024; 18:10104-10112. [PMID: 38527229 DOI: 10.1021/acsnano.3c12776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
Protein layers formed on solid surfaces have important applications in various fields. High-resolution characterization of the morphological structures of protein forms in the process of developing protein layers has significant implications for the control of the layer's quality as well as for the evaluation of the layer's performance. However, it remains challenging to precisely characterize all possible morphological structures of protein in various forms, including individuals, networks, and layers involved in the formation of protein layers with currently available methods. Here, we report a terahertz (THz) morphological reconstruction nanoscopy (THz-MRN), which can reveal the nanoscale three-dimensional structural information on a protein sample from its THz near-field image by exploiting an extended finite dipole model for a thin sample. THz-MRN allows for both surface imaging and subsurface imaging with a vertical resolution of ∼0.5 nm, enabling the characterization of various forms of proteins at the single-molecule level. We demonstrate the imaging and morphological reconstruction of single immunoglobulin G (IgG) molecules, their networks, a monolayer, and a heterogeneous double layer comprising an IgG monolayer and a horseradish peroxidase-conjugated anti-IgG layer. The established THz-MRN presents a useful approach for the label-free and nondestructive study of the formation of protein layers.
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Affiliation(s)
- Zhongbo Yang
- Center of Super-Resolution Optics and Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
- Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
| | - Dandan Li
- Center of Super-Resolution Optics and Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
| | - Ligang Chen
- Center of Super-Resolution Optics and Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
- Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
| | - Fucheng Qiu
- Center of Super-Resolution Optics and Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
- Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
| | - Shihan Yan
- Center of Super-Resolution Optics and Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
- Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
| | - Mingjie Tang
- Center of Super-Resolution Optics and Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
- Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
| | - Chunlei Wang
- Institute of Materiobiology, Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, China
| | - Lihua Wang
- Institute of Materiobiology, Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, China
| | - Yang Luo
- Center of Smart Laboratory and Molecular Medicine, School of Medicine, Chongqing University, Chongqing 400044, China
| | - Fei Sun
- Center for Biological Imaging, Core Facilities for Protein Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Jiaguang Han
- Guangxi Key Laboratory of Optoelectronic Information Processing, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China
| | - Chunhai Fan
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and National Center for Translational Medicine, Shanghai Jiao Tong University, Shanghai 200024, China
| | - Jiang Li
- Institute of Materiobiology, Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, China
| | - Huabin Wang
- Center of Super-Resolution Optics and Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
- Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
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4
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Wehmeier L, Liu M, Park S, Jang H, Basov DN, Homes CC, Carr GL. Ultrabroadband Terahertz Near-Field Nanospectroscopy with a HgCdTe Detector. ACS PHOTONICS 2023; 10:4329-4339. [PMID: 38145170 PMCID: PMC10739990 DOI: 10.1021/acsphotonics.3c01148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 10/27/2023] [Accepted: 11/01/2023] [Indexed: 12/26/2023]
Abstract
While near-field infrared nanospectroscopy provides a powerful tool for nanoscale material characterization, broadband nanospectroscopy of elementary material excitations in the single-digit terahertz (THz) range remains relatively unexplored. Here, we study liquid-Helium-cooled photoconductive Hg1-XCdXTe (MCT) for use as a fast detector in near-field nanospectroscopy. Compared to the common T = 77 K operation, liquid-Helium cooling reduces the MCT detection threshold to ∼22 meV, improves the noise performance, and yields a response bandwidth exceeding 10 MHz. These improved detector properties have a profound impact on the near-field technique, enabling unprecedented broadband nanospectroscopy across a range of 5 to >50 THz (175 to >1750 cm-1, or <6 to 57 μm), i.e., covering what is commonly known as the "THz gap". Our approach has been implemented as a user program at the National Synchrotron Light Source II, Upton, USA, where we showcase ultrabroadband synchrotron nanospectroscopy of phonons in ZnSe (∼7.8 THz) and BaF2 (∼6.7 THz), as well as hyperbolic phonon polaritons in GeS (6-8 THz).
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Affiliation(s)
- Lukas Wehmeier
- National
Synchrotron Light Source II, Brookhaven
National Laboratory; Upton, New York 11973, United States
- Department
of Physics and Astronomy, Stony Brook University; Stony Brook, New York 11794, United States
| | - Mengkun Liu
- National
Synchrotron Light Source II, Brookhaven
National Laboratory; Upton, New York 11973, United States
- Department
of Physics and Astronomy, Stony Brook University; Stony Brook, New York 11794, United States
| | - Suji Park
- Center
for Functional Nanomaterials, Brookhaven
National Laboratory, Upton, New York 11973, United States
| | - Houk Jang
- Center
for Functional Nanomaterials, Brookhaven
National Laboratory, Upton, New York 11973, United States
| | - D. N. Basov
- Department
of Physics, Columbia University; New York, New York 10027, United States
| | - Christopher C. Homes
- National
Synchrotron Light Source II, Brookhaven
National Laboratory; Upton, New York 11973, United States
| | - G. Lawrence Carr
- National
Synchrotron Light Source II, Brookhaven
National Laboratory; Upton, New York 11973, United States
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5
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Tang M, Zhang M, Fu Y, Chen L, Li D, Zhang H, Yang Z, Wang C, Xiu P, Wilksch JJ, Luo Y, Han J, Yang H, Wang H. Terahertz label-free detection of nicotine-induced neural cell changes and the underlying mechanisms. Biosens Bioelectron 2023; 241:115697. [PMID: 37751650 DOI: 10.1016/j.bios.2023.115697] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 08/28/2023] [Accepted: 09/16/2023] [Indexed: 09/28/2023]
Abstract
Nicotine exposure can lead to neurological impairments and brain tumors, and a label-free and nondestructive detection technique is urgently required by the scientific community to assess the effects of nicotine on neural cells. Herein, a terahertz (THz) time-domain attenuated total reflection (TD-ATR) spectroscopy approach is reported, by which the effects of nicotine on normal and cancerous neural cells, i.e., HEB and U87 cells, are successfully investigated in a label/stain-free and nondestructive manner. The obtained THz absorption coefficients of HEB cells exposed to low-dose nicotine and high-dose nicotine are smaller and larger, respectively, than the untreated cells. In contrast, the THz absorption coefficients of U87 cells treated by nicotine are always smaller than the untreated cells. The THz absorption coefficients can be well related to the proliferation properties (cell number and compositional changes) and morphological changes of neural cells, by which different types of neural cells are differentiated and the viabilities of neural cells treated by nicotine are reliably assessed. Collectively, this work sheds new insights on the effects of nicotine on neural cells, and provides a useful tool (THz TD-ATR spectroscopy) for the study of chemical-cell interactions.
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Affiliation(s)
- Mingjie Tang
- Research Center of Super-Resolution Optics & Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing, 400714, China
| | - Mingkun Zhang
- Research Center of Super-Resolution Optics & Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing, 400714, China
| | - Ying Fu
- Research Center of Super-Resolution Optics & Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing, 400714, China
| | - Ligang Chen
- Research Center of Super-Resolution Optics & Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing, 400714, China
| | - Dandan Li
- Research Center of Super-Resolution Optics & Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing, 400714, China
| | - Hua Zhang
- Research Center of Super-Resolution Optics & Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing, 400714, China
| | - Zhongbo Yang
- Research Center of Super-Resolution Optics & Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing, 400714, China
| | - Chunlei Wang
- Department of Chemistry, Shanghai University, Shanghai, 200444, China
| | - Peng Xiu
- Department of Engineering Mechanics, Zhejiang University, Hangzhou, 310027, China
| | - Jonathan J Wilksch
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Yang Luo
- Center of Smart Laboratory and Molecular Medicine, School of Medicine, Chongqing University, Chongqing, 400044, China
| | - Jiaguang Han
- Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China
| | - Haijun Yang
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, China.
| | - Huabin Wang
- Research Center of Super-Resolution Optics & Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing, 400714, China.
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6
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Calandrini E, Voronin K, Balci O, Barra-Burillo M, Bylinkin A, Shinde SM, Sharma S, Casanova F, Hueso LE, Chuvilin A, McAleese C, Conran BR, Wang X, Teo K, Volkov VS, Ferrari AC, Nikitin AY, Hillenbrand R. Near- and Far-Field Observation of Phonon Polaritons in Wafer-Scale Multilayer Hexagonal Boron Nitride Prepared by Chemical Vapor Deposition. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2302045. [PMID: 37441751 DOI: 10.1002/adma.202302045] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 06/10/2023] [Accepted: 07/12/2023] [Indexed: 07/15/2023]
Abstract
Polaritons in layered materials (LMs) are a promising platform to manipulate and control light at the nanometer scale. Thus, the observation of polaritons in wafer-scale LMs is critically important for the development of industrially relevant nanophotonics and optoelectronics applications. In this work, phonon polaritons (PhPs) in wafer-scale multilayer hexagonal boron nitride (hBN) grown by chemical vapor deposition are reported. By infrared nanoimaging, the PhPs are visualized, and PhP lifetimes of ≈0.6 ps are measured, comparable to that of micromechanically exfoliated multilayer hBN. Further, PhP nanoresonators are demonstrated. Their quality factors of ≈50 are about 0.7 times that of state-of-the-art devices based on exfoliated hBN. These results can enable PhP-based surface-enhanced infrared spectroscopy (e.g., for gas sensing) and infrared photodetector applications.
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Affiliation(s)
- Eugenio Calandrini
- CIC nanoGUNE BRTA, Tolosa Hiribidea, 76, Donostia-San Sebastián, 20018, Spain
| | - Kirill Voronin
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal, 4, Donostia-San Sebastián, 20018, Spain
| | - Osman Balci
- Cambridge Graphene Centre, University of Cambridge, 9 JJ Thomson Ave, Cambridge, CB3 0FA, UK
| | - Maria Barra-Burillo
- CIC nanoGUNE BRTA, Tolosa Hiribidea, 76, Donostia-San Sebastián, 20018, Spain
| | - Andrei Bylinkin
- CIC nanoGUNE BRTA, Tolosa Hiribidea, 76, Donostia-San Sebastián, 20018, Spain
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal, 4, Donostia-San Sebastián, 20018, Spain
| | - Sachin M Shinde
- Cambridge Graphene Centre, University of Cambridge, 9 JJ Thomson Ave, Cambridge, CB3 0FA, UK
| | - Subash Sharma
- Cambridge Graphene Centre, University of Cambridge, 9 JJ Thomson Ave, Cambridge, CB3 0FA, UK
| | - Fèlix Casanova
- CIC nanoGUNE BRTA, Tolosa Hiribidea, 76, Donostia-San Sebastián, 20018, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, 48009, Spain
| | - Luis E Hueso
- CIC nanoGUNE BRTA, Tolosa Hiribidea, 76, Donostia-San Sebastián, 20018, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, 48009, Spain
| | - Andrei Chuvilin
- CIC nanoGUNE BRTA, Tolosa Hiribidea, 76, Donostia-San Sebastián, 20018, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, 48009, Spain
| | - Clifford McAleese
- AIXTRON Ltd, Buckingway Business Park, Anderson Rd, Swavesey, Cambridge, CB24 4FQ, UK
| | - Ben R Conran
- AIXTRON Ltd, Buckingway Business Park, Anderson Rd, Swavesey, Cambridge, CB24 4FQ, UK
| | - Xiaochen Wang
- AIXTRON Ltd, Buckingway Business Park, Anderson Rd, Swavesey, Cambridge, CB24 4FQ, UK
| | - Kenneth Teo
- AIXTRON Ltd, Buckingway Business Park, Anderson Rd, Swavesey, Cambridge, CB24 4FQ, UK
| | | | - Andrea C Ferrari
- Cambridge Graphene Centre, University of Cambridge, 9 JJ Thomson Ave, Cambridge, CB3 0FA, UK
| | - Alexey Y Nikitin
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal, 4, Donostia-San Sebastián, 20018, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, 48009, Spain
| | - Rainer Hillenbrand
- CIC nanoGUNE BRTA, Tolosa Hiribidea, 76, Donostia-San Sebastián, 20018, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, 48009, Spain
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7
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Ge S, Zhang D, Peng Z, Meng J. Rough surface effect in terahertz near-field microscopy: 3D simulation analysis. APPLIED OPTICS 2023; 62:6333-6342. [PMID: 37706823 DOI: 10.1364/ao.496849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 07/25/2023] [Indexed: 09/15/2023]
Abstract
Terahertz scattering-type scanning near-field optical microscopy (THz-s-SNOM) has emerged as a powerful technique for high-resolution imaging. However, most previous studies have focused on simplified smooth surface models, overlooking the realistic surface roughness induced by contamination during sample preparation. In this work, we present a novel 3D model, to the best of our knowledge, that combines the point dipole model with the finite element method to investigate the influence of sample morphology on scattered signals. We explore surfaces with a protrusion, a depression, and random roughness, characterizing the variations in scattered signals and highlighting the role of higher-order scattering in mitigating surface roughness effects. Our findings provide valuable insights into the impact of sample morphology on THz-s-SNOM imaging.
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8
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Lu Y, Hale LL, Zaman AM, Addamane SJ, Brener I, Mitrofanov O, Degl’Innocenti R. Near-Field Spectroscopy of Individual Asymmetric Split-Ring Terahertz Resonators. ACS PHOTONICS 2023; 10:2832-2838. [PMID: 37602291 PMCID: PMC10436345 DOI: 10.1021/acsphotonics.3c00527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Indexed: 08/22/2023]
Abstract
Metamaterial resonators have become an efficient and versatile platform in the terahertz frequency range, finding applications in integrated optical devices, such as active modulators and detectors, and in fundamental research, e.g., ultrastrong light-matter investigations. Despite their growing use, characterization of modes supported by these subwavelength elements has proven to be challenging and it still relies on indirect observation of the collective far-field transmission/reflection properties of resonator arrays. Here, we present a broadband time-domain spectroscopic investigation of individual metamaterial resonators via a THz aperture scanning near-field microscope (a-SNOM). The time-domain a-SNOM allows the mapping and quantitative analysis of strongly confined modes supported by the resonators. In particular, a cross-polarized configuration presented here allows an investigation of weakly radiative modes. These results hold great potential to advance future metamaterial-based optoelectronic platforms for fundamental research in THz photonics.
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Affiliation(s)
- Yuezhen Lu
- School
of Engineering, New Engineering Building, Lancaster University, Gillow Ave, Bailrigg, Lancaster LA1 4YW, U.K.
| | - Lucy L. Hale
- Electronic
and Electrical Engineering, University College
London, London WC1E 7JE, U.K.
| | - Abdullah M. Zaman
- School
of Engineering, New Engineering Building, Lancaster University, Gillow Ave, Bailrigg, Lancaster LA1 4YW, U.K.
| | - Sadhvikas J. Addamane
- Center
for Integrated Nanotechnologies, Sandia
National Laboratories, Albuquerque, New Mexico 87123, United States
| | - Igal Brener
- Center
for Integrated Nanotechnologies, Sandia
National Laboratories, Albuquerque, New Mexico 87123, United States
| | - Oleg Mitrofanov
- Electronic
and Electrical Engineering, University College
London, London WC1E 7JE, U.K.
- Center
for Integrated Nanotechnologies, Sandia
National Laboratories, Albuquerque, New Mexico 87123, United States
| | - Riccardo Degl’Innocenti
- School
of Engineering, New Engineering Building, Lancaster University, Gillow Ave, Bailrigg, Lancaster LA1 4YW, U.K.
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9
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Li X, Sun J, Jin L, Shangguan Y, Chen K, Qin H. Sub-terahertz scanning near-field optical microscope using a quartz tuning fork based probe. OPTICS EXPRESS 2023; 31:19754-19765. [PMID: 37381384 DOI: 10.1364/oe.487167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 05/19/2023] [Indexed: 06/30/2023]
Abstract
We report a sub-terahertz scattering-type scanning near-field microscope (sub-THz s-SNOM) which uses a 6 mm long metallic tip driven by a quartz tuning fork as the near-field probe. Under continuous-wave illumination by a 94 GHz Gunn diode oscillator, terahertz near-field images are obtained by demodulating the scattered wave at both the fundamental and the second harmonic of the tuning fork oscillation frequency together with the atomic-force-microscope (AFM) image. The terahertz near-field image of a gold grating with a period of 2.3 µm obtained at the fundamental modulation frequency agrees well with the AFM image. The experimental relationship between the signal demodulated at the fundamental frequency and the tip-sample distance is well fitted with the coupled dipole model indicating that the scattered signal from the long probe is mainly contributed by the near-field interaction between the tip and the sample. This near-filed probe scheme using quartz tuning fork can adjust the tip length flexibly to match the wavelength over the entire terahertz frequency range and allows for operation in cryogenic environment.
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10
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Feres FH, Barcelos ID, Cadore AR, Wehmeier L, Nörenberg T, Mayer RA, Freitas RO, Eng LM, Kehr SC, Maia FCB. Graphene Nano-Optics in the Terahertz Gap. NANO LETTERS 2023; 23:3913-3920. [PMID: 37126430 DOI: 10.1021/acs.nanolett.3c00578] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Graphene nano-optics at terahertz (THz) frequencies (ν) is theoretically anticipated to feature extraordinary effects. However, interrogating such phenomena is nontrivial, since the atomically thin graphene dimensionally mismatches the THz radiation wavelength reaching hundreds of micrometers. Greater challenges happen in the THz gap (0.1-10 THz) wherein light sources are scarce. To surpass these barriers, we use a nanoscope illuminated by a highly brilliant and tunable free-electron laser to image the graphene nano-optical response from 1.5 to 6.0 THz. For ν < 2 THz, we observe a metal-like behavior of graphene, which screens optical fields akin to noble metals, since this excitation range approaches its charge relaxation frequency. At 3.8 THz, plasmonic resonances cause a field-enhancement effect (FEE) that improves the graphene imaging power. Moreover, we show that the metallic behavior and the FEE are tunable upon electrical doping, thus providing further control of these graphene nano-optical properties in the THz gap.
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Affiliation(s)
- Flávio H Feres
- "Gleb Wataghin" Institute of Physics, State University of Campinas (UNICAMP), Campinas, Sao Paulo 13083-859, Brazil
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Sao Paulo 13083-970, Brazil
- Institute of Applied Physics, Technische Universität Dresden, 01062 Dresden, Germany
| | - Ingrid D Barcelos
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Sao Paulo 13083-970, Brazil
| | - Alisson R Cadore
- Brazilian Nanotechnology National Laboratory LNNano, Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Sao Paulo 13083-970, Brazil
| | - Lukas Wehmeier
- Institute of Applied Physics, Technische Universität Dresden, 01062 Dresden, Germany
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States of America
| | - Tobias Nörenberg
- Institute of Applied Physics, Technische Universität Dresden, 01062 Dresden, Germany
- Würzburg-Dresden Cluster of Excellence - EXC 2147 (ct.qmat), Technische Universität Dresden, 01062 Dresden, Germany
| | - Rafael A Mayer
- "Gleb Wataghin" Institute of Physics, State University of Campinas (UNICAMP), Campinas, Sao Paulo 13083-859, Brazil
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Sao Paulo 13083-970, Brazil
| | - Raul O Freitas
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Sao Paulo 13083-970, Brazil
| | - Lukas M Eng
- Institute of Applied Physics, Technische Universität Dresden, 01062 Dresden, Germany
- Würzburg-Dresden Cluster of Excellence - EXC 2147 (ct.qmat), Technische Universität Dresden, 01062 Dresden, Germany
| | - Susanne C Kehr
- Institute of Applied Physics, Technische Universität Dresden, 01062 Dresden, Germany
- Würzburg-Dresden Cluster of Excellence - EXC 2147 (ct.qmat), Technische Universität Dresden, 01062 Dresden, Germany
| | - Francisco C B Maia
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Sao Paulo 13083-970, Brazil
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11
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Chen S, Leng PL, Konečná A, Modin E, Gutierrez-Amigo M, Vicentini E, Martín-García B, Barra-Burillo M, Niehues I, Maciel Escudero C, Xie XY, Hueso LE, Artacho E, Aizpurua J, Errea I, Vergniory MG, Chuvilin A, Xiu FX, Hillenbrand R. Real-space observation of ultraconfined in-plane anisotropic acoustic terahertz plasmon polaritons. NATURE MATERIALS 2023:10.1038/s41563-023-01547-8. [PMID: 37142739 DOI: 10.1038/s41563-023-01547-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 03/31/2023] [Indexed: 05/06/2023]
Abstract
Thin layers of in-plane anisotropic materials can support ultraconfined polaritons, whose wavelengths depend on the propagation direction. Such polaritons hold potential for the exploration of fundamental material properties and the development of novel nanophotonic devices. However, the real-space observation of ultraconfined in-plane anisotropic plasmon polaritons (PPs)-which exist in much broader spectral ranges than phonon polaritons-has been elusive. Here we apply terahertz nanoscopy to image in-plane anisotropic low-energy PPs in monoclinic Ag2Te platelets. The hybridization of the PPs with their mirror image-by placing the platelets above a Au layer-increases the direction-dependent relative polariton propagation length and the directional polariton confinement. This allows for verifying a linear dispersion and elliptical isofrequency contour in momentum space, revealing in-plane anisotropic acoustic terahertz PPs. Our work shows high-symmetry (elliptical) polaritons on low-symmetry (monoclinic) crystals and demonstrates the use of terahertz PPs for local measurements of anisotropic charge carrier masses and damping.
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Affiliation(s)
- S Chen
- Terahertz Technology Innovation Research Institute, National Basic Science Center-Terahertz Science and Technology Frontier, Terahertz Precision Biomedical Discipline 111 Project, Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, Shanghai, China
- CIC nanoGUNE BRTA, Donostia-San Sebastián, Spain
| | - P L Leng
- State Key Laboratory of Surface Physics and Department of Physics, Institute for Nanoelectronic Devices and Quantum Computing, Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai, China
| | - A Konečná
- Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic
- Institute of Physical Engineering, Brno University of Technology, Brno, Czech Republic
| | - E Modin
- CIC nanoGUNE BRTA, Donostia-San Sebastián, Spain
| | - M Gutierrez-Amigo
- Materials Physics Center, CSIC-UPV/EHU, Donostia-San Sebastián, Spain
- Departamento de Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Bilbao, Spain
| | - E Vicentini
- CIC nanoGUNE BRTA, Donostia-San Sebastián, Spain
| | - B Martín-García
- CIC nanoGUNE BRTA, Donostia-San Sebastián, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
| | | | - I Niehues
- CIC nanoGUNE BRTA, Donostia-San Sebastián, Spain
| | - C Maciel Escudero
- CIC nanoGUNE BRTA, Donostia-San Sebastián, Spain
- Materials Physics Center, CSIC-UPV/EHU, Donostia-San Sebastián, Spain
| | - X Y Xie
- State Key Laboratory of Surface Physics and Department of Physics, Institute for Nanoelectronic Devices and Quantum Computing, Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai, China
| | - L E Hueso
- CIC nanoGUNE BRTA, Donostia-San Sebastián, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
| | - E Artacho
- CIC nanoGUNE BRTA, Donostia-San Sebastián, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
- Theory of Condensed Matter, Cavendish Laboratory, University of Cambridge, Cambridge, UK
- Donostia International Physics Centre (DIPC), Donostia-San Sebastián, Spain
| | - J Aizpurua
- Materials Physics Center, CSIC-UPV/EHU, Donostia-San Sebastián, Spain
- Donostia International Physics Centre (DIPC), Donostia-San Sebastián, Spain
| | - I Errea
- Materials Physics Center, CSIC-UPV/EHU, Donostia-San Sebastián, Spain
- Donostia International Physics Centre (DIPC), Donostia-San Sebastián, Spain
- Departamento de Física Aplicada, Escuela de Ingeniería de Gipuzkoa, Universidad del País Vasco (UPV/EHU), Donostia-San Sebastián, Spain
| | - M G Vergniory
- Donostia International Physics Centre (DIPC), Donostia-San Sebastián, Spain
- Max Planck for Chemical Physics of Solids, Dresden, Germany
| | - A Chuvilin
- CIC nanoGUNE BRTA, Donostia-San Sebastián, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
| | - F X Xiu
- State Key Laboratory of Surface Physics and Department of Physics, Institute for Nanoelectronic Devices and Quantum Computing, Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai, China.
| | - R Hillenbrand
- IKERBASQUE, Basque Foundation for Science, Bilbao, Spain.
- CIC nanoGUNE BRTA and Department of Electricity and Electronics, UPV/EHU, Donostia-San Sebastián, Spain.
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12
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Ermolaev GA, Vyslanko IS, Tselin AP, El-Sayed MA, Tatmyshevskiy MK, Slavich AS, Yakubovsky DI, Mironov MS, Mazitov AB, Eghbali A, Panova DA, Romanov RI, Markeev AM, Kruglov IA, Novikov SM, Vyshnevyy AA, Arsenin AV, Volkov VS. Broadband Optical Properties of Bi 2Se 3. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13091460. [PMID: 37177004 PMCID: PMC10180482 DOI: 10.3390/nano13091460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 04/18/2023] [Accepted: 04/21/2023] [Indexed: 05/15/2023]
Abstract
Materials with high optical constants are of paramount importance for efficient light manipulation in nanophotonics applications. Recent advances in materials science have revealed that van der Waals (vdW) materials have large optical responses owing to strong in-plane covalent bonding and weak out-of-plane vdW interactions. However, the optical constants of vdW materials depend on numerous factors, e.g., synthesis and transfer method. Here, we demonstrate that in a broad spectral range (290-3300 nm) the refractive index n and the extinction coefficient k of Bi2Se3 are almost independent of synthesis technology, with only a ~10% difference in n and k between synthesis approaches, unlike other vdW materials, such as MoS2, which has a ~60% difference between synthesis approaches. As a practical demonstration, we showed, using the examples of biosensors and therapeutic nanoparticles, that this slight difference in optical constants results in reproducible efficiency in Bi2Se3-based photonic devices.
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Affiliation(s)
- Georgy A Ermolaev
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
| | - Ivan S Vyslanko
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
| | - Andrey P Tselin
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
- Photonics and Quantum Materials Department, Skolkovo Institute of Science and Technology, 3 Nobel Str., Moscow 143026, Russia
| | - Marwa A El-Sayed
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
- Department of Physics, Faculty of Science, Menoufia University, Shebin El-Koom 32511, Egypt
| | - Mikhail K Tatmyshevskiy
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
| | - Aleksandr S Slavich
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
| | - Dmitry I Yakubovsky
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
| | - Mikhail S Mironov
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
| | - Arslan B Mazitov
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
| | - Amir Eghbali
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
| | - Daria A Panova
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
| | - Roman I Romanov
- Department of Solid State Physics and Nanosystems, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 31 Kashirskoe Sh., Moscow 115409, Russia
| | - Andrey M Markeev
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
| | - Ivan A Kruglov
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
- Center of Fundamental and Applied Research, Dukhov Research Institute of Automatics (VNIIA), 22 Suschevskaya Str., Moscow 127055, Russia
| | - Sergey M Novikov
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
| | - Andrey A Vyshnevyy
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
| | - Aleksey V Arsenin
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
- Laboratory of Advanced Functional Materials, Yerevan State University, 1 Alek Manukyan Str., Yerevan 0025, Armenia
| | - Valentyn S Volkov
- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
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13
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Schäffer S, Ogolla CO, Loth Y, Haeger T, Kreusel C, Runkel M, Riedl T, Butz B, Wigger AK, Bolívar PH. Imaging the Terahertz Nanoscale Conductivity of Polycrystalline CsPbBr 3 Perovskite Thin Films. NANO LETTERS 2023; 23:2074-2080. [PMID: 36862532 DOI: 10.1021/acs.nanolett.2c03214] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Terahertz (THz) radiation is a valuable tool to investigate the electronic properties of lead halide perovskites (LHPs). However, attaining high-resolution information remains elusive, as the diffraction-limited spatial resolution (∼300 μm) of conventional THz methods prevents a direct analysis of microscopic effects. Here, we employ THz scattering scanning near-field optical microscopy (THz-sSNOM) for nanoscale imaging of cesium lead bromide (CsPbBr3) thin films down to the single grain level at 600 GHz. Adopting a scattering model, we are able to derive the local THz nanoscale conductivity in a contact-free fashion. Increased THz near-field signals at CsPbBr3 grain boundaries complemented by correlative transmission electron microscopy-energy-dispersive X-ray spectroscopy elemental analysis point to the formation of halide vacancies (VBr) and Pb-Pb bonds, which induce charge carrier trapping and can lead to nonradiative recombination. Our study establishes THz-sSNOM as a powerful THz nanoscale analysis platform for thin-film semiconductors such as LHPs.
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Affiliation(s)
- Stephan Schäffer
- Institute for High Frequency and Quantum Electronics, University of Siegen, 57076 Siegen, Germany
| | | | - Yannik Loth
- Institute for High Frequency and Quantum Electronics, University of Siegen, 57076 Siegen, Germany
| | - Tobias Haeger
- Institute of Electronic Devices, University of Wuppertal, 42119 Wuppertal, Germany
| | - Cedric Kreusel
- Institute of Electronic Devices, University of Wuppertal, 42119 Wuppertal, Germany
| | - Manuel Runkel
- Institute of Electronic Devices, University of Wuppertal, 42119 Wuppertal, Germany
| | - Thomas Riedl
- Institute of Electronic Devices, University of Wuppertal, 42119 Wuppertal, Germany
| | - Benjamin Butz
- Micro-and Nanoanalytics Group, University of Siegen, 57076 Siegen, Germany
| | - Anna Katharina Wigger
- Institute for High Frequency and Quantum Electronics, University of Siegen, 57076 Siegen, Germany
| | - Peter Haring Bolívar
- Institute for High Frequency and Quantum Electronics, University of Siegen, 57076 Siegen, Germany
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14
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Krishnamoorthy HNS, Dubrovkin AM, Adamo G, Soci C. Topological Insulator Metamaterials. Chem Rev 2023; 123:4416-4442. [PMID: 36943013 DOI: 10.1021/acs.chemrev.2c00594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
Confinement of electromagnetic fields at the subwavelength scale via metamaterial paradigms is an established method to engineer light-matter interaction in most common material systems, from insulators to semiconductors and from metals to superconductors. In recent years, this approach has been extended to the realm of topological materials, providing a new avenue to access nontrivial features of their electronic band structure. In this review, we survey various topological material classes from a photonics standpoint, including crystal growth and lithographic structuring methods. We discuss how exotic electronic features such as spin-selective Dirac plasmon polaritons in topological insulators or hyperbolic plasmon polaritons in Weyl semimetals may give rise to unconventional magneto-optic, nonlinear, and circular photogalvanic effects in metamaterials across the visible to infrared spectrum. Finally, we dwell on how these effects may be dynamically controlled by applying external perturbations in the form of electric and magnetic fields or ultrafast optical pulses. Through these examples and future perspectives, we argue that topological insulator, semimetal and superconductor metamaterials are unique systems to bridge the missing links between nanophotonic, electronic, and spintronic technologies.
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Affiliation(s)
- Harish N S Krishnamoorthy
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonic Institute, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Alexander M Dubrovkin
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonic Institute, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Giorgio Adamo
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonic Institute, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Cesare Soci
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonic Institute, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
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15
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Zheng C, Zhang Y, Zhang W. Programmable Polariton Topological Insulators All-Optically Controlled by the Stark Effect. ACS APPLIED MATERIALS & INTERFACES 2023; 15:4764-4773. [PMID: 36630144 DOI: 10.1021/acsami.2c19115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Efficiently and flexibly manipulating unidirectional edge states is key to developing topological insulators as functional devices. In this work, we propose an all-optical method that utilizes the valley-selective optical Stark effect to realize programmable topological insulators. We pattern a two-dimensional honeycomb structure in an exciton-polariton platform resulting from a strong light-matter coupling in a monolayer transition metal dichalcogenide. The optical Stark effect is induced to generate a pseudo magnetic field, combined with spin-orbit coupling to form the topological one-way edge states of the polariton. On account of the ultrafast switching speed and precisely spatial controllability of the optical Stark effect, two applications, i.e., ports ratio tunable polariton splitter and programmable polariton router, were demonstrated, showing designable and rewritable functionality of all-optically controllable polariton topological insulators. This study paves the way to robustly and intelligently control/form polaritonic and spintronic devices for future classical and quantum information processing and application.
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Affiliation(s)
- Chuyuan Zheng
- School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu611731, China
| | - Yanli Zhang
- School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu611731, China
| | - Weili Zhang
- School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu611731, China
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16
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Nörenberg T, Álvarez-Pérez G, Obst M, Wehmeier L, Hempel F, Klopf JM, Nikitin AY, Kehr SC, Eng LM, Alonso-González P, de Oliveira TVAG. Germanium Monosulfide as a Natural Platform for Highly Anisotropic THz Polaritons. ACS NANO 2022; 16:20174-20185. [PMID: 36446407 PMCID: PMC9799068 DOI: 10.1021/acsnano.2c05376] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 11/08/2022] [Indexed: 05/17/2023]
Abstract
Terahertz (THz) electromagnetic radiation is key to access collective excitations such as magnons (spins), plasmons (electrons), or phonons (atomic vibrations), thus bridging topics between optics and solid-state physics. Confinement of THz light to the nanometer length scale is desirable for local probing of such excitations in low-dimensional systems, thereby circumventing the large footprint and inherently low spectral power density of far-field THz radiation. For that purpose, phonon polaritons (PhPs) in anisotropic van der Waals (vdW) materials have recently emerged as a promising platform for THz nanooptics. Hence, there is a demand for the exploration of materials that feature not only THz PhPs at different spectral regimes but also host anisotropic (directional) electrical, thermoelectric, and vibronic properties. To that end, we introduce here the semiconducting vdW-material alpha-germanium(II) sulfide (GeS) as an intriguing candidate. By employing THz nanospectroscopy supported by theoretical analysis, we provide a thorough characterization of the different in-plane hyperbolic and elliptical PhP modes in GeS. We find not only PhPs with long lifetimes (τ > 2 ps) and excellent THz light confinement (λ0/λ > 45) but also an intrinsic, phonon-induced anomalous dispersion as well as signatures of naturally occurring, substrate-mediated PhP canalization within a single GeS slab.
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Affiliation(s)
- Tobias Nörenberg
- Institut für
Angewandte Physik, Technische Universität
Dresden, Dresden 01187, Germany
- Würzburg-Dresden
Cluster of Excellence - EXC 2147 (ct.qmat), Dresden 01062, Germany
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - Gonzalo Álvarez-Pérez
- Department of Physics, University
of Oviedo, Oviedo 33006, Spain
- Center of Research
on Nanomaterials and Nanotechnology CINN (CSIC−Universidad
de Oviedo), El Entrego 33940, Spain
| | - Maximilian Obst
- Institut für
Angewandte Physik, Technische Universität
Dresden, Dresden 01187, Germany
| | - Lukas Wehmeier
- Institut für
Angewandte Physik, Technische Universität
Dresden, Dresden 01187, Germany
- Würzburg-Dresden
Cluster of Excellence - EXC 2147 (ct.qmat), Dresden 01062, Germany
| | - Franz Hempel
- Institut für
Angewandte Physik, Technische Universität
Dresden, Dresden 01187, Germany
- Collaborative Research
Center 1415, Technische Universität
Dresden, Dresden 01069, Germany
| | - J. Michael Klopf
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - Alexey Y. Nikitin
- Donostia International
Physics Center (DIPC), Donostia-San
Sebastián 20018, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao 48013, Spain
| | - Susanne C. Kehr
- Institut für
Angewandte Physik, Technische Universität
Dresden, Dresden 01187, Germany
| | - Lukas M. Eng
- Institut für
Angewandte Physik, Technische Universität
Dresden, Dresden 01187, Germany
- Würzburg-Dresden
Cluster of Excellence - EXC 2147 (ct.qmat), Dresden 01062, Germany
- Collaborative Research
Center 1415, Technische Universität
Dresden, Dresden 01069, Germany
| | - Pablo Alonso-González
- Department of Physics, University
of Oviedo, Oviedo 33006, Spain
- Center of Research
on Nanomaterials and Nanotechnology CINN (CSIC−Universidad
de Oviedo), El Entrego 33940, Spain
| | - Thales V. A. G. de Oliveira
- Institut für
Angewandte Physik, Technische Universität
Dresden, Dresden 01187, Germany
- Würzburg-Dresden
Cluster of Excellence - EXC 2147 (ct.qmat), Dresden 01062, Germany
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
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17
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In C, Kim UJ, Choi H. Two-dimensional Dirac plasmon-polaritons in graphene, 3D topological insulator and hybrid systems. LIGHT, SCIENCE & APPLICATIONS 2022; 11:313. [PMID: 36302746 PMCID: PMC9613982 DOI: 10.1038/s41377-022-01012-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 08/22/2022] [Accepted: 10/10/2022] [Indexed: 06/16/2023]
Abstract
Collective oscillations of massless particles in two-dimensional (2D) Dirac materials offer an innovative route toward implementing atomically thin devices based on low-energy quasiparticle interactions. Strong confinement of near-field distribution on the 2D surface is essential to demonstrate extraordinary optoelectronic functions, providing means to shape the spectral response at the mid-infrared (IR) wavelength. Although the dynamic polarization from the linear response theory has successfully accounted for a range of experimental observations, a unified perspective was still elusive, connecting the state-of-the-art developments based on the 2D Dirac plasmon-polaritons. Here, we review recent works on graphene and three-dimensional (3D) topological insulator (TI) plasmon-polariton, where the mid-IR and terahertz (THz) radiation experiences prominent confinement into a deep-subwavelength scale in a novel optoelectronic structure. After presenting general light-matter interactions between 2D Dirac plasmon and subwavelength quasiparticle excitations, we introduce various experimental techniques to couple the plasmon-polaritons with electromagnetic radiations. Electrical and optical controls over the plasmonic excitations reveal the hybridized plasmon modes in graphene and 3D TI, demonstrating an intense near-field interaction of 2D Dirac plasmon within the highly-compressed volume. These findings can further be applied to invent optoelectronic bio-molecular sensors, atomically thin photodetectors, and laser-driven light sources.
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Affiliation(s)
- Chihun In
- Department of Physics, Freie Universität Berlin, Berlin, 14195, Germany
- Department of Physical Chemistry, Fritz-Haber-Institute of the Max-Planck-Society, Berlin, 14195, Germany
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Republic of Korea
- Institute of Applied Physics, Seoul National University, Seoul, 08826, Republic of Korea
| | - Un Jeong Kim
- Advanced Sensor Laboratory, Samsung Advanced Institute of Technology, Suwon, Gyeonggi-do, 16419, Republic of Korea.
| | - Hyunyong Choi
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Republic of Korea.
- Institute of Applied Physics, Seoul National University, Seoul, 08826, Republic of Korea.
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18
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Pistore V, Pogna EAA, Viti L, Li L, Davies AG, Linfield EH, Vitiello MS. Self-Induced Phase Locking of Terahertz Frequency Combs in a Phase-Sensitive Hyperspectral Near-Field Nanoscope. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2200410. [PMID: 35711084 PMCID: PMC9534969 DOI: 10.1002/advs.202200410] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 05/04/2022] [Indexed: 06/15/2023]
Abstract
Chip-scale, electrically-pumped terahertz (THz) frequency-combs (FCs) rely on nonlinear four-wave-mixing processes, and have a nontrivial phase relationship between the evenly spaced set of emitted modes. Simultaneous monitoring and manipulation of the intermode phase coherence, without any external seeding or active modulation, is a very demanding task for which there has hitherto been no technological solution. Here, a self-mixing intermode-beatnote spectroscopy system is demonstrated, based on THz quantum cascade laser FCs, in which light is back-scattered from the tip of a scanning near-field optical-microscope (SNOM) and the intracavity reinjection monitored. This enables to exploit the sensitivity of FC phase-coherence to optical feedback and, for the first time, manipulate the amplitude, linewidth and frequency of the intermode THz FC beatnote using the feedback itself. Stable phase-locked regimes are used to construct a FC-based hyperspectral, THz s-SNOM nanoscope. This nanoscope provides 160 nm spatial resolution, coherent detection of multiple phase-locked modes, and mapping of the THz optical response of nanoscale materials up to 3.5 THz, with noise-equivalent-power (NEP) ≈400 pW √Hz-1 . This technique can be applied to the entire infrared range, opening up a new approach to hyper-spectral near-field imaging with wide-scale applications in the study of plasmonics and quantum science, inter alia.
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Affiliation(s)
- Valentino Pistore
- NESTCNR‐Istituto Nanoscienze and Scuola Normale SuperiorePisa5612Italy
| | | | - Leonardo Viti
- NESTCNR‐Istituto Nanoscienze and Scuola Normale SuperiorePisa5612Italy
| | - Lianhe Li
- School of Electronic and Electrical EngineeringUniversity of LeedsLeedsLS2 9JTUK
| | - A. Giles Davies
- School of Electronic and Electrical EngineeringUniversity of LeedsLeedsLS2 9JTUK
| | - Edmund H. Linfield
- School of Electronic and Electrical EngineeringUniversity of LeedsLeedsLS2 9JTUK
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19
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Abstract
High-performance THz photodetection is unprecedentedly accessed by integrating a topological Dirac (Weyl) semimetal in a carefully designed antenna at deep-subwavelength scales.
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Affiliation(s)
- Carlo Rizza
- University of L'Aquila, Department of Physical and Chemical Sciences, I-67100, L'Aquila, Italy.
| | - Alessandro Molle
- Consiglio Nazionale delle Ricerche (CNR), Istituto per la Microelettronica e Microsistemi (IMM), unit of Agrate Brianza, via C. Olivetti 2, 20864, Agrate Brianza, Italy
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