The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Marko Loncar - One of the best experts on this subject based on the ideXlab platform.
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High Quality Factor suspended 1d photonic crystal phc extended cavity for bio sensing
IEEE International Radar Conference, 2017Co-Authors: Ahmad Rifqi Md Zain, Burhanuddin Yeop Majlis, Marko LoncarAbstract:In this paper we report the consistency in controlling the Q-Factor value ranging from 1000 to 80,000 together with good free spectral range (FSR) control between the resonance frequencies of between 30 nm to 62 nm of a long cavity based on SOI. The cavities that were considered in this paper ranged from 2 pm to 6 pm in length. The Q-Factors for each resonance obtained for that particular extended cavity were measured in different occasion which has 5% variation in the Q- value over a period of times. We expect that the removal of Silica cladding underneath the silicon waveguide will enhance the Q- value due to better optical confinement within the waveguide.
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integrated High Quality Factor lithium niobate microdisk resonators
Optics Express, 2014Co-Authors: Cheng Wang, Michael J Burek, Haig A Atikian, Ichun Huang, Peter R H Stark, Vivek Venkataraman, Marko LoncarAbstract:Lithium Niobate (LN) is an important nonlinear optical material. Here we demonstrate LN microdisk resonators that feature optical Quality Factor ~105, realized using robust and scalable fabrication techniques, that operate over a wide wavelength range spanning visible and near infrared. Using our resonators, and leveraging LN’s large second order optical nonlinearity, we demonstrate on-chip second harmonic generation with a conversion efficiency of 0.109 W−1.
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Integrated High-Quality Factor silicon-on-sapphire resonators for mid-infrared applications
CLEO: 2013, 2013Co-Authors: Raji Shankar, Man Bulu, Marko LoncarAbstract:We demonstrate High-Quality (Q) Factor grating-coupled silicon-on-sapphire ring resonators, operating around 4.5 μm. Total Q-Factors of 151,000 and intrinsic Q-Factors of 278,000 are measured, enabling applications in nonlinear wavelength generation and other areas.
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integrated High Quality Factor optical resonators in diamond
Nano Letters, 2013Co-Authors: Birgit Hausmann, Vivek Venkataraman, Irfan Bulu, Parag B Deotare, Murray W Mccutcheon, Matthew Markham, D J Twitchen, Marko LoncarAbstract:The realization of an integrated diamond photonic platform, based on a thin single crystal diamond film on top of a silicon dioxide/silicon substrate, is reported. Using this approach, we demonstrate High-Quality Factor single crystal diamond race-track resonators, operating at near-infrared wavelengths (1550 nm). The devices are integrated with low-loss diamond waveguides terminated with polymer pads (spot size converters) to facilitate in- (out-) coupling of light from (to) an optical fiber. Optical characterization of these resonators reveal Quality Factors as High as ∼250 000 and overall insertion losses as low as 1 dB/facet. Scattering induced mode splitting as well as signatures of nonlinear effects such as optical bistability are observed at an input pump power of ∼100 mW in the waveguides.
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integrated High Quality Factor silicon on sapphire ring resonators for the mid infrared
Applied Physics Letters, 2013Co-Authors: Raji Shankar, Irfan Bulu, Marko LoncarAbstract:We demonstrate High-Quality (Q) Factor grating-coupled ring resonators in a silicon-on-sapphire platform, operating at wavelengths between 4.3 and 4.6 μm. Total Q-Factors of 151 000 and intrinsic Q-Factors of 278 000 are measured, representing the Highest Q-Factors measured at the mid-infrared in Si.
Parag B Deotare - One of the best experts on this subject based on the ideXlab platform.
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integrated High Quality Factor optical resonators in diamond
Nano Letters, 2013Co-Authors: Birgit Hausmann, Vivek Venkataraman, Irfan Bulu, Parag B Deotare, Murray W Mccutcheon, Matthew Markham, D J Twitchen, Marko LoncarAbstract:The realization of an integrated diamond photonic platform, based on a thin single crystal diamond film on top of a silicon dioxide/silicon substrate, is reported. Using this approach, we demonstrate High-Quality Factor single crystal diamond race-track resonators, operating at near-infrared wavelengths (1550 nm). The devices are integrated with low-loss diamond waveguides terminated with polymer pads (spot size converters) to facilitate in- (out-) coupling of light from (to) an optical fiber. Optical characterization of these resonators reveal Quality Factors as High as ∼250 000 and overall insertion losses as low as 1 dB/facet. Scattering induced mode splitting as well as signatures of nonlinear effects such as optical bistability are observed at an input pump power of ∼100 mW in the waveguides.
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fabrication and characterization of High Quality Factor silicon nitride nanobeam cavities
arXiv: Quantum Physics, 2010Co-Authors: Mughees Khan, Murray W Mccutcheon, Parag B Deotare, Thomas M Babinec, Marko LoncarAbstract:Si3N4 is an excellent material for applications of nanophotonics at visible wavelengths due to its wide bandgap and moderately large refractive index (n $\approx$ 2.0). We present the fabrication and characterization of Si3N4 photonic crystal nanobeam cavities for coupling to diamond nanocrystals and Nitrogen-Vacancy centers in a cavity QED system. Confocal micro-photoluminescence analysis of the nanobeam cavities demonstrates Quality Factors up to Q ~ 55,000, which is limited by the resolution of our spectrometer. We also demonstrate coarse tuning of cavity resonances across the 600-700nm range by lithographically scaling the size of fabricated devices. This is an order of magnitude improvement over previous SiNx cavities at this important wavelength range.
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High Quality Factor photonic crystal nanobeam cavities
Applied Physics Letters, 2009Co-Authors: Parag B Deotare, Murray W Mccutcheon, Ian W Frank, Mughees Khan, Marko LoncarAbstract:We investigate the design, fabrication, and experimental characterization of High Quality Factor photonic crystal nanobeam cavities in silicon. Using a five-hole tapered one-dimensional photonic crystal mirror and precise control of the cavity length, we designed cavities with theoretical Quality Factors as High as 1.4×107. By detecting the cross-polarized resonantly scattered light from a normally incident laser beam, we measure a Quality Factor of nearly 7.5×105. The effect of cavity size on mode frequency and Quality Factor was simulated and then verified experimentally.
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High Quality Factor photonic crystal nanobeam cavities
arXiv: Optics, 2009Co-Authors: Parag B Deotare, Murray W Mccutcheon, Ian W Frank, Mughees Khan, Marko LoncarAbstract:We investigate the design, fabrication and experimental characterization of High Quality Factor photonic crystal nanobeam cavities in silicon. Using a five-hole tapered 1D photonic crystal mirror and precise control of the cavity length, we designed cavities with theoretical Quality Factors as High as 14 million. By detecting the cross-polarized resonantly scattered light from a normally incident laser beam, we measure a Quality Factor of nearly 750,000. The effect of cavity size on mode frequency and Quality Factor was simulated and then verified experimentally.
Michal Lipson - One of the best experts on this subject based on the ideXlab platform.
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methods to achieve ultra High Quality Factor silicon nitride resonators
APL Photonics, 2021Co-Authors: Samantha P Roberts, Mateus Coratozanarella, Michal LipsonAbstract:On-chip resonators are promising candidates for applications in a wide range of integrated photonic fields, such as communications, spectroscopy, biosensing, and optical filters, due to their compact size, wavelength selectivity, tunability, and flexible structure. The High Quality (Q) Factor is a main positive attribute of on-chip resonators that makes it possible for them to provide High sensitivity, narrow bandpass, and low power consumption. In this Tutorial, we discuss methods to achieve ultra-High Q Factor on-chip resonators on a silicon nitride (Si3N4) platform. We outline the microfabrication processes, including detailed descriptions and recipes for steps such as deposition, lithography, etch, cladding, and etch facet, and then describe the measurement of the Q Factor and methods to improve it. We also discuss how to extract the basic loss limit and determine the contribution of each loss source in the waveguide and resonator. We present a modified model for calculating scattering losses, which successfully relates the measured roughness of the waveguide interface to the overall performance of the device. We conclude with a summary of work done to date with low pressure chemical vapor deposition Si3N4 resonator devices, confinement, cross-sectional dimensions, bend radius, Q Factor, and propagation loss.
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High Quality Factor pecvd si 3 n4 ring resonators compatible with cmos process
Conference on Lasers and Electro-Optics, 2019Co-Authors: Samantha P Roberts, Michal LipsonAbstract:We demonstrate High-confinement Si 3 N 4 resonators with intrinsic Quality Factor more than 1 million using standard PECVD process. We show that by addressing scattering, the loss at 1.6 µm can be as low as 0.4 dB/cm. © 2019 The Author(s)
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overcoming si_3n_4 film stress limitations for High Quality Factor ring resonators
Optics Express, 2013Co-Authors: Kevin Luke, Carl B Poitras, Avik Dutt, Michal LipsonAbstract:Silicon nitride (Si3N4) ring resonators are critical for a variety of photonic devices. However the intrinsically High film stress of silicon nitride has limited both the optical confinement and Quality Factor (Q) of ring resonators. We show that stress in Si3N4 films can be overcome by introducing mechanical trenches for isolating photonic devices from propagating cracks. We demonstrate a Si3N4 ring resonator with an intrinsic Quality Factor of 7 million, corresponding to a propagation loss of 4.2 dB/m. This is the Highest Quality Factor reported to date for High confinement Si3N4 ring resonators in the 1550 nm wavelength range.
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overcoming si3n4 film stress limitations for High Quality Factor ring resonators
arXiv: Optics, 2013Co-Authors: Kevin Luke, Carl B Poitras, Avik Dutt, Michal LipsonAbstract:Silicon nitride (Si3N4) ring resonators are critical for a variety of photonic devices. However the intrinsically High film stress of silicon nitride has limited both the optical confinement and Quality Factor (Q) of ring resonators. We show that stress in Si3N4 films can be overcome by introducing mechanical trenches for isolating photonic devices from propagating cracks. We demonstrate a Si3N4 ring resonator with an intrinsic Quality Factor of 7 million, corresponding to a propagation loss of 4.2 dB/m. This is the Highest Quality Factor reported to date for High confinement Si3N4 ring resonators in the 1550 nm wavelength range.
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High Quality Factor and High confinement silicon resonators using etchless process
Optics Express, 2012Co-Authors: Austin G Griffith, Jaime Cardenas, Carl B Poitras, Michal LipsonAbstract:We demonstrate High Quality Factor and High confinement in a silicon ring resonator fabricated by a thermal oxidation process. We fabricated a 50 μm bending radius racetrack resonator, with a 5 μm coupling region. We achieved an intrinsic Quality Factor of 760,000 for the fundamental TM mode, which corresponds to a propagation loss of 0.9 dB/cm. Both the fundamental TE and TM modes are Highly confined in the waveguide, with effective indices of 3.0 for the TE mode and 2.9 for the TM mode.
Murray W Mccutcheon - One of the best experts on this subject based on the ideXlab platform.
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integrated High Quality Factor optical resonators in diamond
Nano Letters, 2013Co-Authors: Birgit Hausmann, Vivek Venkataraman, Irfan Bulu, Parag B Deotare, Murray W Mccutcheon, Matthew Markham, D J Twitchen, Marko LoncarAbstract:The realization of an integrated diamond photonic platform, based on a thin single crystal diamond film on top of a silicon dioxide/silicon substrate, is reported. Using this approach, we demonstrate High-Quality Factor single crystal diamond race-track resonators, operating at near-infrared wavelengths (1550 nm). The devices are integrated with low-loss diamond waveguides terminated with polymer pads (spot size converters) to facilitate in- (out-) coupling of light from (to) an optical fiber. Optical characterization of these resonators reveal Quality Factors as High as ∼250 000 and overall insertion losses as low as 1 dB/facet. Scattering induced mode splitting as well as signatures of nonlinear effects such as optical bistability are observed at an input pump power of ∼100 mW in the waveguides.
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fabrication and characterization of High Quality Factor silicon nitride nanobeam cavities
arXiv: Quantum Physics, 2010Co-Authors: Mughees Khan, Murray W Mccutcheon, Parag B Deotare, Thomas M Babinec, Marko LoncarAbstract:Si3N4 is an excellent material for applications of nanophotonics at visible wavelengths due to its wide bandgap and moderately large refractive index (n $\approx$ 2.0). We present the fabrication and characterization of Si3N4 photonic crystal nanobeam cavities for coupling to diamond nanocrystals and Nitrogen-Vacancy centers in a cavity QED system. Confocal micro-photoluminescence analysis of the nanobeam cavities demonstrates Quality Factors up to Q ~ 55,000, which is limited by the resolution of our spectrometer. We also demonstrate coarse tuning of cavity resonances across the 600-700nm range by lithographically scaling the size of fabricated devices. This is an order of magnitude improvement over previous SiNx cavities at this important wavelength range.
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High Quality Factor photonic crystal nanobeam cavities
Applied Physics Letters, 2009Co-Authors: Parag B Deotare, Murray W Mccutcheon, Ian W Frank, Mughees Khan, Marko LoncarAbstract:We investigate the design, fabrication, and experimental characterization of High Quality Factor photonic crystal nanobeam cavities in silicon. Using a five-hole tapered one-dimensional photonic crystal mirror and precise control of the cavity length, we designed cavities with theoretical Quality Factors as High as 1.4×107. By detecting the cross-polarized resonantly scattered light from a normally incident laser beam, we measure a Quality Factor of nearly 7.5×105. The effect of cavity size on mode frequency and Quality Factor was simulated and then verified experimentally.
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High Quality Factor photonic crystal nanobeam cavities
arXiv: Optics, 2009Co-Authors: Parag B Deotare, Murray W Mccutcheon, Ian W Frank, Mughees Khan, Marko LoncarAbstract:We investigate the design, fabrication and experimental characterization of High Quality Factor photonic crystal nanobeam cavities in silicon. Using a five-hole tapered 1D photonic crystal mirror and precise control of the cavity length, we designed cavities with theoretical Quality Factors as High as 14 million. By detecting the cross-polarized resonantly scattered light from a normally incident laser beam, we measure a Quality Factor of nearly 750,000. The effect of cavity size on mode frequency and Quality Factor was simulated and then verified experimentally.
Masaya Notomi - One of the best experts on this subject based on the ideXlab platform.
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High Quality Factor whispering gallery mode in the photonic crystal hexagonal disk cavity
Optics Express, 2004Co-Authors: Masaya NotomiAbstract:We study whispering-gallery-like modes in photonic crystal air-bridge slab micro-cavities having H2 defects using finite-difference time-domain calculations. The defect geometry is optimized to increase the Quality Factor (Q) of the H2-cavity whispering-gallery mode (WGM). By symmetrically distributing 12 nearest neighbor holes around the defect and controlling size of holes, it is possible to drastically increase the Q of >105 while preserving effective mode volume of the order of the cubic wavelength in material. In addition, we investigate the effect of a dielectric circular post located around the center of the H2 cavity. This post can act as current and heat flow paths that promise electrically-pumped thermally-stable lasing operation. It is interesting to observe that the introduction of the post structure increases the Q of the WGM upto 4×105 and the High Q >105 is still maintained even with large post size. Although diffractive out-coupling through the post is increased, radiated power outside the post is suppressed, which leads to large enhancement of the Q of the H2-cavity WGM.
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High Quality Factor and small mode volume hexapole modes in photonic crystal slab nanocavities
Applied Physics Letters, 2003Co-Authors: Masaya NotomiAbstract:Using finite-difference time-domain calculations, we investigate the hexapole mode of photonic-crystal-slab modified triangular single-defect cavity structures as a good candidate for a High-Quality Factor (Q) and small-mode volume (V) resonant mode. Structural parameters are optimized to obtain very large Q of even Higher than 2×106 with small effective V of the order of cubic wavelength in material, the record value of theoretical Q/V. It is found, by the Fourier-space investigation of resonant modes, that such a High Q from the hexapole mode is achieved due both to the cancellation mechanism related to hexagonally symmetric whispering-gallery-mode distribution and to the mode delocalization mechanism.
