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Logan AD, Yama NS, Fu KMC. Selective active resonance tuning for multi-mode nonlinear photonic cavities. OPTICS EXPRESS 2024; 32:13396-13407. [PMID: 38859311 DOI: 10.1364/oe.512048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Accepted: 03/18/2024] [Indexed: 06/12/2024]
Abstract
Resonant enhancement of nonlinear photonic processes is critical for the scalability of applications such as long-distance entanglement generation. To implement nonlinear resonant enhancement, multiple resonator modes must be individually tuned onto a precise set of process wavelengths, which requires multiple linearly-independent tuning methods. Using coupled auxiliary resonators to indirectly tune modes in a multi-resonant nonlinear cavity is particularly attractive because it allows the extension of a single physical tuning mechanism, such as thermal tuning, to provide the required independent controls. Here we model and simulate the performance and tradeoffs of a coupled-resonator tuning scheme which uses auxiliary resonators to tune specific modes of a multi-resonant nonlinear process. Our analysis determines the tuning bandwidth for steady-state mode field intensity can significantly exceed the inter-cavity coupling rate g if the total quality factor of the auxiliary resonator is higher than the multi-mode main resonator. Consequently, over-coupling a nonlinear resonator mode to improve the maximum efficiency of a frequency conversion process will simultaneously expand the auxiliary resonator tuning bandwidth for that mode, indicating a natural compatibility with this tuning scheme. We apply the model to an existing small-diameter triply-resonant ring resonator design and find that a tuning bandwidth of 136 GHz ≈ 1.1 nm can be attained for a mode in the telecom band while limiting excess scattering losses to a quality factor of 106. Such range would span the distribution of inhomogeneously broadened quantum emitter ensembles as well as resonator fabrication variations, indicating the potential for the auxiliary resonators to enable not only low-loss telecom conversion but also the generation of indistinguishable photons in a quantum network.
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Nijem J, Naiman A, Zektzer R, Frydendahl C, Mazurski N, Levy U. High-Q and high finesse silicon microring resonator. OPTICS EXPRESS 2024; 32:7896-7906. [PMID: 38439459 DOI: 10.1364/oe.514080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Accepted: 01/09/2024] [Indexed: 03/06/2024]
Abstract
We demonstrate the design, fabrication, and experimental characterization of a single transverse mode adiabatic microring resonator (MRR) implemented using the silicon-on- insulator (SOI) platform using local oxidation of silicon (LOCOS) approach. Following its fabrication, the device was characterized experimentally and an ultrahigh intrinsic Q-factor of ∼2 million with a free spectral range (FSR) of 2 nm was achieved, giving rise to a finesse of ∼1100, the highest demonstrated so far in SOI platform at the telecom band. We have further studied our device to analyze the source of losses that occur in the MRR and to understand the limits of the achievable Q-factor. The surface roughness was quantified using AFM scans and the root mean square roughness was found to be ∼ 0.32±0.03 nm. The nonlinear losses were further examined by coupling different optical power levels into the MRR. Indeed, we could observe that the nonlinear losses become more pronounced at power levels in the range of hundreds of microwatts. The demonstrated approach for constructing high-Q and high finesse MRRs can play a major role in the implementation of devices such as modulators, sensors, filters, frequency combs and devices that are used for quantum applications, e.g., photon pair generation.
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Moille G, Lu X, Stone J, Westly D, Srinivasan K. Fourier Synthesis Dispersion Engineering of Photonic Crystal Microrings for Broadband Frequency Combs. COMMUNICATIONS PHYSICS 2023; 6:10.1038/s42005-023-01253-6. [PMID: 38450291 PMCID: PMC10916593 DOI: 10.1038/s42005-023-01253-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 05/24/2023] [Indexed: 03/08/2024]
Abstract
Dispersion engineering of microring resonators is crucial for optical frequency comb applications, to achieve targeted bandwidths and powers of individual comb teeth. However, conventional microrings only present two geometric degrees of freedom - width and thickness - which limits the degree to which dispersion can be controlled. We present a technique where we tune individual resonance frequencies for arbitrary dispersion tailoring. Using a photonic crystal microring resonator that induces coupling to both directions of propagation within the ring, we investigate an intuitive design based on Fourier synthesis. Here, the desired photonic crystal spatial profile is obtained through a Fourier relationship with the targeted modal frequency shifts, where each modal shift is determined based on the corresponding effective index modulation of the ring. Experimentally, we demonstrate several distinct dispersion profiles over dozens of modes in transverse magnetic polarization. In contrast, we find that the transverse electric polarization requires a more advanced model that accounts for the discontinuity of the field at the modulated interface. Finally, we present simulations showing arbitrary frequency comb spectral envelope tailoring using our Frequency synthesis approach.
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Affiliation(s)
- Grégory Moille
- Joint Quantum Institute, NIST/University of Maryland, College Park, USA
- Microsystems and Nanotechnology Division, National Institute of Standards and Technology, Gaithersburg, USA
| | - Xiyuan Lu
- Joint Quantum Institute, NIST/University of Maryland, College Park, USA
- Microsystems and Nanotechnology Division, National Institute of Standards and Technology, Gaithersburg, USA
| | - Jordan Stone
- Joint Quantum Institute, NIST/University of Maryland, College Park, USA
- Microsystems and Nanotechnology Division, National Institute of Standards and Technology, Gaithersburg, USA
| | - Daron Westly
- Microsystems and Nanotechnology Division, National Institute of Standards and Technology, Gaithersburg, USA
| | - Kartik Srinivasan
- Joint Quantum Institute, NIST/University of Maryland, College Park, USA
- Microsystems and Nanotechnology Division, National Institute of Standards and Technology, Gaithersburg, USA
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Bonneville DB, Albert M, Arbi R, Munir M, Segat Frare BL, Miarabbas Kiani K, Frankis HC, Knights AP, Turak A, Sask KN, Bradley JDB. Hybrid silicon-tellurium-dioxide DBR resonators coated in PMMA for biological sensing. BIOMEDICAL OPTICS EXPRESS 2023; 14:1545-1561. [PMID: 37078058 PMCID: PMC10110299 DOI: 10.1364/boe.485824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 02/23/2023] [Accepted: 02/23/2023] [Indexed: 05/03/2023]
Abstract
We report on silicon waveguide distributed Bragg reflector (DBR) cavities hybridized with a tellurium dioxide (TeO2) cladding and coated in plasma functionalized poly (methyl methacrylate) (PMMA) for label free biological sensors. We describe the device structure and fabrication steps, including reactive sputtering of TeO2 and spin coating and plasma functionalization of PMMA on foundry processed Si chips, as well as the characterization of two DBR designs via thermal, water, and bovine serum albumin (BSA) protein sensing. Plasma treatment on the PMMA films was shown to decrease the water droplet contact angle from ∼70 to ∼35°, increasing hydrophilicity for liquid sensing, while adding functional groups on the surface of the sensors intended to assist with immobilization of BSA molecules. Thermal, water and protein sensing were demonstrated on two DBR designs, including waveguide-connected sidewall (SW) and waveguide-adjacent multi-piece (MP) gratings. Limits of detection of 60 and 300 × 10-4 RIU were measured via water sensing, and thermal sensitivities of 0.11 and 0.13 nm/°C were measured from 25-50 °C for SW and MP DBR cavities, respectively. Plasma treatment was shown to enable protein immobilization and sensing of BSA molecules at a concentration of 2 µg/mL diluted in phosphate buffered saline, demonstrating a ∼1.6 nm resonance shift and subsequent full recovery to baseline after stripping the proteins with sodium dodecyl sulfate for a MP DBR device. These results are a promising step towards active and laser-based sensors using rare-earth-doped TeO2 in silicon photonic circuits, which can be subsequently coated in PMMA and functionalized via plasma treatment for label free biological sensing.
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Affiliation(s)
- Dawson B. Bonneville
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7,
Canada
| | - Mitchell Albert
- Department of Materials Science and
Engineering, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7, Canada
| | - Ramis Arbi
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7,
Canada
| | - Muhammad Munir
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7,
Canada
| | - Bruno L. Segat Frare
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7,
Canada
| | - Khadijeh Miarabbas Kiani
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7,
Canada
| | - Henry C. Frankis
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7,
Canada
| | - Andrew P. Knights
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7,
Canada
| | - Ayse Turak
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7,
Canada
- School of Biomedical Engineering, McMaster University, Hamilton, Canada
| | - Kyla N. Sask
- Department of Materials Science and
Engineering, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7, Canada
- School of Biomedical Engineering, McMaster University, Hamilton, Canada
| | - Jonathan D. B. Bradley
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7,
Canada
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Puumala LS, Grist SM, Wickremasinghe K, Al-Qadasi MA, Chowdhury SJ, Liu Y, Mitchell M, Chrostowski L, Shekhar S, Cheung KC. An Optimization Framework for Silicon Photonic Evanescent-Field Biosensors Using Sub-Wavelength Gratings. BIOSENSORS 2022; 12:bios12100840. [PMID: 36290977 PMCID: PMC9599562 DOI: 10.3390/bios12100840] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 09/30/2022] [Accepted: 09/30/2022] [Indexed: 05/31/2023]
Abstract
Silicon photonic (SiP) evanescent-field biosensors aim to combine the information-rich readouts offered by lab-scale diagnostics, at a significantly lower cost, and with the portability and rapid time to result offered by paper-based assays. While SiP biosensors fabricated with conventional strip waveguides can offer good sensitivity for label-free detection in some applications, there is still opportunity for improvement. Efforts have been made to design higher-sensitivity SiP sensors with alternative waveguide geometries, including sub-wavelength gratings (SWGs). However, SWG-based devices are fragile and prone to damage, limiting their suitability for scalable and portable sensing. Here, we investigate SiP microring resonator sensors designed with SWG waveguides that contain a "fishbone" and highlight the improved robustness offered by this design. We present a framework for optimizing fishbone-style SWG waveguide geometries based on numerical simulations, then experimentally measure the performance of ring resonator sensors fabricated with the optimized waveguides, targeting operation in the O-band and C-band. For the O-band and C-band devices, we report bulk sensitivities up to 349 nm/RIU and 438 nm/RIU, respectively, and intrinsic limits of detection as low as 5.1 × 10-4 RIU and 7.1 × 10-4 RIU, respectively. This performance is comparable to the state of the art in SWG-based sensors, positioning fishbone SWG resonators as an attractive, more robust, alternative to conventional SWG designs.
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Affiliation(s)
- Lauren S. Puumala
- School of Biomedical Engineering, University of British Columbia, 251-2222 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada
- Centre for Blood Research, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada
| | - Samantha M. Grist
- School of Biomedical Engineering, University of British Columbia, 251-2222 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada
- Centre for Blood Research, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada
- Dream Photonics Inc., Vancouver, BC V6T 0A7, Canada
| | - Kithmin Wickremasinghe
- Department of Electrical and Computer Engineering, University of British Columbia, 5500-2332 Main Mall, Vancouver, BC V6T 1Z4, Canada
| | - Mohammed A. Al-Qadasi
- Department of Electrical and Computer Engineering, University of British Columbia, 5500-2332 Main Mall, Vancouver, BC V6T 1Z4, Canada
| | - Sheri Jahan Chowdhury
- Department of Electrical and Computer Engineering, University of British Columbia, 5500-2332 Main Mall, Vancouver, BC V6T 1Z4, Canada
| | - Yifei Liu
- Department of Electrical and Computer Engineering, University of British Columbia, 5500-2332 Main Mall, Vancouver, BC V6T 1Z4, Canada
| | - Matthew Mitchell
- Dream Photonics Inc., Vancouver, BC V6T 0A7, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, 2355 East Mall, Vancouver, BC V6T 1Z4, Canada
| | - Lukas Chrostowski
- Dream Photonics Inc., Vancouver, BC V6T 0A7, Canada
- Department of Electrical and Computer Engineering, University of British Columbia, 5500-2332 Main Mall, Vancouver, BC V6T 1Z4, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, 2355 East Mall, Vancouver, BC V6T 1Z4, Canada
| | - Sudip Shekhar
- Dream Photonics Inc., Vancouver, BC V6T 0A7, Canada
- Department of Electrical and Computer Engineering, University of British Columbia, 5500-2332 Main Mall, Vancouver, BC V6T 1Z4, Canada
| | - Karen C. Cheung
- School of Biomedical Engineering, University of British Columbia, 251-2222 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada
- Centre for Blood Research, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada
- Department of Electrical and Computer Engineering, University of British Columbia, 5500-2332 Main Mall, Vancouver, BC V6T 1Z4, Canada
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Hassan MM, Baten MZ. Label-free detection of virus-like particles employing rotationally symmetric nanowire array based whispering gallery and quasi-whispering gallery resonant modes onto a silicon platform. OPTICS EXPRESS 2021; 29:25745-25761. [PMID: 34614897 DOI: 10.1364/oe.432064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 07/13/2021] [Indexed: 06/13/2023]
Abstract
In spite of tremendous advancements in modern diagnostics, there is a dire need for reliable, label-free detection of highly contagious pathogens like viruses. In view of the limitations of existing diagnostic techniques, the present theoretical study proposes a novel scheme of detecting virus-like particles employing whispering gallery and quasi-whispering gallery resonant modes of a composite optical system. Whereas whispering gallery mode (WGM) resonators are conventionally realized using micro-disk, -ring, -toroid or spherical structures, the present study utilizes a rotationally symmetric array of silicon nanowires which offers higher sensitivity compared to the conventional WGM resonator while detecting virus-like particles. Notwithstanding the relatively low quality factor of the system, the underlying multiple-scattering mediated photon entrapment, coupled with peripheral total-internal reflection, results in high fidelity of the system against low signal-to-noise ratio. Finite difference time domain based numerical analysis has been performed to correlate resonant modes of the array with spatial location of the virus. The correlation has been subsequently utilized for statistical analysis of simulated test cases. Assuming detection to be limited by resolution of the measurement system, results of the analysis suggest that for only about 5% of the simulate test cases the resonant wavelength shift lies within the minimum detection range of 0.001-0.01 nm. For a single virus of 160 nm diameter, more than 8 nm shift of the resonant mode and nearly 100% change of quality factor are attained with the proposed nanowire array based photonic structure.
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