The Experts below are selected from a list of 85293 Experts worldwide ranked by ideXlab platform
Yong-zhen Huang - One of the best experts on this subject based on the ideXlab platform.
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mode characteristics and vertical Radiation Loss for algainas inp microcylinder lasers
Journal of The Optical Society of America B-optical Physics, 2015Co-Authors: Yuede Yang, Jinlong Xiao, Yong-zhen HuangAbstract:Mode characteristics are experimentally and numerically investigated for the AlGaInAs/InP microcylinder lasers with radii R ranging from 3.25 to 5.5 μm. The measured lasing spectra suggest wavelength crossing between different radial-order modes at R=3.5 μm, and the threshold current dramatically increases as R<3.5 μm, which can be well explained by three-dimensional finite-difference time-domain simulation. The simulated mode Q factors greatly degrade in the microcylinder resonators as R<3.5 μm and strongly depend on the mode wavelength because of vertical Radiation Loss, which results in a limitation for low threshold lasing. In addition, the near coincidence of mode wavelengths for different radial modes indicates the possible mode coupling at R=3.5 μm.
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Analysis of vertical Radiation Loss and far-field pattern for microcylinder lasers with an output waveguide.
Optics express, 2013Co-Authors: Yong-zhen Huang, Yuede Yang, Heng Long, Ling-xiu Zou, Qi-feng Yao, Xin Jin, Jinlong XiaoAbstract:Vertical Radiation Loss and far-field pattern are investigated for microcylinder lasers by 3D FDTD simulation and experimentally. The numerical results show that an output waveguide connected to the microcylinder resonator can result in additional vertical Radiation Loss for high Q coupled modes and affect the far field pattern. The vertical Radiation Loss can be controlled by adjusting the up cladding layer thickness. Furthermore, two lobes of vertical far-field patterns are observed for a 15-μm-radius microcylinder laser connected with an output waveguide, which confirms the vertical Radiation Loss.
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high q tm whispering gallery modes in three dimensional microcylinders
Physical Review A, 2007Co-Authors: Yuede Yang, Yong-zhen Huang, Qin ChenAbstract:We present a generation condition for realizing high-Q TM whispering-gallery modes (WGMs) in semiconductor microcylinders. For microcylinders with symmetry or weak asymmetry vertical waveguiding, we show that TM WGMs can have a high Q factor, with the magnitude of 10(4) at the radius of the microcylinder of 1 mu m, by three-dimensional numerical simulation. The Q factor of TE WGMs is much less than that of TM WGMs in the semiconductor microcylinders due to a vertical Radiation Loss caused by mode coupling with the vertical propagating mode. The results open up a possible application of TM WGMs in semiconductor microcylinders for efficient current injection microlasers and single photon sources.
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resonant frequencies and quality factors for optical equilateral triangle resonators calculated by fdtd technique and the pade approximation
IEEE Photonics Technology Letters, 2000Co-Authors: Yong-zhen Huang, Qiming WangAbstract:The mode wavelength and quality factor (Q-factor) for resonant modes in optical equilateral triangle resonators (ETR's) are calculated by the finite-difference time-domain (FDTD) technique and the Pade approximation. For an ETR with the side length of 3 /spl mu/m and the refractive index of 3.2, we get the mode wavelength interval of about 70 nm and the Q-factor of the fundamental mode over 10/sup 3/. The results show that the ETR is suitable to realize single-mode operation, and that the Radiation Loss in the corner regions of ETR is rather low. In addition, the numerical results of the mode wavelength agree very well with our analytical formula.
Jinlong Xiao - One of the best experts on this subject based on the ideXlab platform.
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mode characteristics and vertical Radiation Loss for algainas inp microcylinder lasers
Journal of The Optical Society of America B-optical Physics, 2015Co-Authors: Yuede Yang, Jinlong Xiao, Yong-zhen HuangAbstract:Mode characteristics are experimentally and numerically investigated for the AlGaInAs/InP microcylinder lasers with radii R ranging from 3.25 to 5.5 μm. The measured lasing spectra suggest wavelength crossing between different radial-order modes at R=3.5 μm, and the threshold current dramatically increases as R<3.5 μm, which can be well explained by three-dimensional finite-difference time-domain simulation. The simulated mode Q factors greatly degrade in the microcylinder resonators as R<3.5 μm and strongly depend on the mode wavelength because of vertical Radiation Loss, which results in a limitation for low threshold lasing. In addition, the near coincidence of mode wavelengths for different radial modes indicates the possible mode coupling at R=3.5 μm.
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Analysis of vertical Radiation Loss and far-field pattern for microcylinder lasers with an output waveguide.
Optics express, 2013Co-Authors: Yong-zhen Huang, Yuede Yang, Heng Long, Ling-xiu Zou, Qi-feng Yao, Xin Jin, Jinlong XiaoAbstract:Vertical Radiation Loss and far-field pattern are investigated for microcylinder lasers by 3D FDTD simulation and experimentally. The numerical results show that an output waveguide connected to the microcylinder resonator can result in additional vertical Radiation Loss for high Q coupled modes and affect the far field pattern. The vertical Radiation Loss can be controlled by adjusting the up cladding layer thickness. Furthermore, two lobes of vertical far-field patterns are observed for a 15-μm-radius microcylinder laser connected with an output waveguide, which confirms the vertical Radiation Loss.
Yuede Yang - One of the best experts on this subject based on the ideXlab platform.
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mode characteristics and vertical Radiation Loss for algainas inp microcylinder lasers
Journal of The Optical Society of America B-optical Physics, 2015Co-Authors: Yuede Yang, Jinlong Xiao, Yong-zhen HuangAbstract:Mode characteristics are experimentally and numerically investigated for the AlGaInAs/InP microcylinder lasers with radii R ranging from 3.25 to 5.5 μm. The measured lasing spectra suggest wavelength crossing between different radial-order modes at R=3.5 μm, and the threshold current dramatically increases as R<3.5 μm, which can be well explained by three-dimensional finite-difference time-domain simulation. The simulated mode Q factors greatly degrade in the microcylinder resonators as R<3.5 μm and strongly depend on the mode wavelength because of vertical Radiation Loss, which results in a limitation for low threshold lasing. In addition, the near coincidence of mode wavelengths for different radial modes indicates the possible mode coupling at R=3.5 μm.
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Analysis of vertical Radiation Loss and far-field pattern for microcylinder lasers with an output waveguide.
Optics express, 2013Co-Authors: Yong-zhen Huang, Yuede Yang, Heng Long, Ling-xiu Zou, Qi-feng Yao, Xin Jin, Jinlong XiaoAbstract:Vertical Radiation Loss and far-field pattern are investigated for microcylinder lasers by 3D FDTD simulation and experimentally. The numerical results show that an output waveguide connected to the microcylinder resonator can result in additional vertical Radiation Loss for high Q coupled modes and affect the far field pattern. The vertical Radiation Loss can be controlled by adjusting the up cladding layer thickness. Furthermore, two lobes of vertical far-field patterns are observed for a 15-μm-radius microcylinder laser connected with an output waveguide, which confirms the vertical Radiation Loss.
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high q tm whispering gallery modes in three dimensional microcylinders
Physical Review A, 2007Co-Authors: Yuede Yang, Yong-zhen Huang, Qin ChenAbstract:We present a generation condition for realizing high-Q TM whispering-gallery modes (WGMs) in semiconductor microcylinders. For microcylinders with symmetry or weak asymmetry vertical waveguiding, we show that TM WGMs can have a high Q factor, with the magnitude of 10(4) at the radius of the microcylinder of 1 mu m, by three-dimensional numerical simulation. The Q factor of TE WGMs is much less than that of TM WGMs in the semiconductor microcylinders due to a vertical Radiation Loss caused by mode coupling with the vertical propagating mode. The results open up a possible application of TM WGMs in semiconductor microcylinders for efficient current injection microlasers and single photon sources.
Jianju Che - One of the best experts on this subject based on the ideXlab platform.
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an on chip polarization splitter based on the Radiation Loss in the bending hybrid plasmonic waveguide structure
Applied Physics Letters, 2017Co-Authors: Kexiu Rong, Saisai Chu, Qihuang Gong, Jianju CheAbstract:Polarization beam splitters (PBSs) are one of the key components in the integrated photonic circuits. To increase the integration density, various complex hybrid plasmonic structures have been numerically designed to shrink the footprints of the PBSs. Here, to decrease the complexity of the small hybrid structures and the difficulty of the hybrid micro-nano fabrications, the Radiation Losses are utilized to experimentally demonstrate an ultra-small, broadband, and efficient PBS in a simple bending hybrid plasmonic waveguide structure. The hybrid plasmonic waveguide comprising a dielectric strip on the metal surface supports both the transverse-magnetic (TM) and transverse-electric (TE) waveguide modes. Because of the different field confinements, the TE waveguide mode has larger Radiation Loss than the TM waveguide mode in the bending hybrid strip waveguide. Based on the different Radiation Losses, the two incident waveguide modes of orthogonal polarization states are efficiently split in the proposed str...
Susumu Noda - One of the best experts on this subject based on the ideXlab platform.
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investigation of point defect cavity formed in two dimensional photonic crystal slab with one sided dielectric cladding
Applied Physics Letters, 2006Co-Authors: Yoshinori Tanaka, Takashi Asano, Ranko Hatsuta, Susumu NodaAbstract:Three-missing-hole point-defect cavities formed in a two-dimensional photonic crystal slab with a silicon-on-insulator structure are investigated. It is theoretically revealed that Radiation Loss to the SiO2-cladding side is four times higher than that to the air-cladding side due to the smaller refractive index contrast. In addition, in-plane Radiation due to transverse electric-transverse magnetic (TE-TM) coupling occurs due to the vertical structural asymmetry. The amount of TE-TM coupling Loss is comparable with that of Radiation Loss to the SiO2 cladding. Experimental results agreed well with theoretical predictions. This treatment can be applied to point-defect cavities in one-sided dielectric cladding structures and in three-dimensional configurations.
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investigation of point defect cavity formed in two dimensional photonic crystal slab with one sided dielectric cladding
Applied Physics Letters, 2006Co-Authors: Yoshinori Tanaka, Takashi Asano, Ranko Hatsuta, Susumu NodaAbstract:Three-missing-hole point-defect cavities formed in a two-dimensional photonic crystal slab with a silicon-on-insulator structure are investigated. It is theoretically revealed that Radiation Loss to the SiO2-cladding side is four times higher than that to the air-cladding side due to the smaller refractive index contrast. In addition, in-plane Radiation due to transverse electric-transverse magnetic (TE-TM) coupling occurs due to the vertical structural asymmetry. The amount of TE-TM coupling Loss is comparable with that of Radiation Loss to the SiO2 cladding. Experimental results agreed well with theoretical predictions. This treatment can be applied to point-defect cavities in one-sided dielectric cladding structures and in three-dimensional configurations.
