The Experts below are selected from a list of 27792 Experts worldwide ranked by ideXlab platform
Hironori Sasaki - One of the best experts on this subject based on the ideXlab platform.
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Silicon Waveguide Contradirectional Coupler Polarization Rotation Bragg Grating
2020 IEEE Photonics Conference (IPC), 2020Co-Authors: Hideaki Okayama, Yosuke Onawa, Hiroyuki Takahashi, Daisuke Shimura, Hiroki Yaegashi, Hironori SasakiAbstract:We report contra-directional coupler type Polarization Rotation Bragg gratings using silicon waveguides. Waveguides incorporating a Bragg grating for Polarization Rotation and having different widths are placed near to each other. A single grating can separate the backward diffraction light. The diffracted backward Polarization rotated light is separated from the input port without using any other element. A distinct Polarization rotated wavelength peak was observed at the backward drop port of fabricated device.
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OECC/PSC - Silicon waveguide Polarization Rotation Bragg grating using directional coupling
2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC), 2019Co-Authors: Hideaki Okayama, Yosuke Onawa, Hiroyuki Takahashi, Daisuke Shimura, Hiroki Yaegashi, Hironori SasakiAbstract:We report directional coupler type Polarization Rotation Bragg gratings using silicon waveguides. Waveguides with Bragg grating for Polarization Rotation and having different widths are placed near to each other. Two types of devices are reported in this presentation.
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Polarization Rotation Bragg diffraction using Si wire waveguide grating and Polarization rotator.
Optics express, 2015Co-Authors: Hideaki Okayama, Yosuke Onawa, Daisuke Shimura, Hiroki Yaegashi, Hironori SasakiAbstract:We report Polarization independent Bragg grating wavelength filter with high diffraction efficiency. A rib waveguide Polarization rotator and antisymmetric grating structure for fundamental to first order diffraction are used to generate the Polarization Rotation Bragg diffraction. The diffraction efficiencies and peak wavelengths become the same for two orthogonal input Polarizations. Strong diffraction is attained easily. The concept was verified by simulation and experiment. Polarization independent band-pass filter consisting of Polarization beam splitter and Polarization Rotation Bragg diffraction was experimentally demonstrated.
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Polarization Rotation Bragg grating using Si wire waveguide with non-vertical sidewall
Optics express, 2014Co-Authors: Hideaki Okayama, Yosuke Onawa, Daisuke Shimura, Hiroki Yaegashi, Hironori SasakiAbstract:We report Polarization independent Bragg grating wavelength filter using Polarization Rotation. A non-vertical waveguide sidewall and antisymmetric grating structure can be used to generate the Polarization Rotation of the fundamental modes. The diffraction efficiencies and peaks becomes the same for two orthogonal input Polarizations. The concept was verified by simulation and experiment.
Hideaki Okayama - One of the best experts on this subject based on the ideXlab platform.
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Silicon Waveguide Contradirectional Coupler Polarization Rotation Bragg Grating
2020 IEEE Photonics Conference (IPC), 2020Co-Authors: Hideaki Okayama, Yosuke Onawa, Hiroyuki Takahashi, Daisuke Shimura, Hiroki Yaegashi, Hironori SasakiAbstract:We report contra-directional coupler type Polarization Rotation Bragg gratings using silicon waveguides. Waveguides incorporating a Bragg grating for Polarization Rotation and having different widths are placed near to each other. A single grating can separate the backward diffraction light. The diffracted backward Polarization rotated light is separated from the input port without using any other element. A distinct Polarization rotated wavelength peak was observed at the backward drop port of fabricated device.
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OECC/PSC - Silicon waveguide Polarization Rotation Bragg grating using directional coupling
2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC), 2019Co-Authors: Hideaki Okayama, Yosuke Onawa, Hiroyuki Takahashi, Daisuke Shimura, Hiroki Yaegashi, Hironori SasakiAbstract:We report directional coupler type Polarization Rotation Bragg gratings using silicon waveguides. Waveguides with Bragg grating for Polarization Rotation and having different widths are placed near to each other. Two types of devices are reported in this presentation.
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Polarization Rotation Bragg diffraction using Si wire waveguide grating and Polarization rotator.
Optics express, 2015Co-Authors: Hideaki Okayama, Yosuke Onawa, Daisuke Shimura, Hiroki Yaegashi, Hironori SasakiAbstract:We report Polarization independent Bragg grating wavelength filter with high diffraction efficiency. A rib waveguide Polarization rotator and antisymmetric grating structure for fundamental to first order diffraction are used to generate the Polarization Rotation Bragg diffraction. The diffraction efficiencies and peak wavelengths become the same for two orthogonal input Polarizations. Strong diffraction is attained easily. The concept was verified by simulation and experiment. Polarization independent band-pass filter consisting of Polarization beam splitter and Polarization Rotation Bragg diffraction was experimentally demonstrated.
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Polarization Rotation Bragg grating using Si wire waveguide with non-vertical sidewall
Optics express, 2014Co-Authors: Hideaki Okayama, Yosuke Onawa, Daisuke Shimura, Hiroki Yaegashi, Hironori SasakiAbstract:We report Polarization independent Bragg grating wavelength filter using Polarization Rotation. A non-vertical waveguide sidewall and antisymmetric grating structure can be used to generate the Polarization Rotation of the fundamental modes. The diffraction efficiencies and peaks becomes the same for two orthogonal input Polarizations. The concept was verified by simulation and experiment.
Masaki Azuma - One of the best experts on this subject based on the ideXlab platform.
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enhanced piezoelectric response due to Polarization Rotation in cobalt substituted bifeo3 epitaxial thin films
Advanced Materials, 2016Co-Authors: Keisuke Shimizu, Hajime Hojo, Yuichi Ikuhara, Masaki AzumaAbstract:Polarization Rotation induced by an external electric field in piezoelectric materials such as PbZr1-x Tix O3 is generally regarded as the origin of their large piezoelectric responses. Here, the piezoelectric responses of high-quality cobalt-substituted BiFeO3 epitaxial thin films with monoclinic distortions are systematically examined. It is demonstrated that Polarization Rotation plays a crucial role in improving the piezoelectric responses in this material.
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Enhanced Piezoelectric Response due to Polarization Rotation in Cobalt‐Substituted BiFeO3 Epitaxial Thin Films
Advanced materials (Deerfield Beach Fla.), 2016Co-Authors: Keisuke Shimizu, Hajime Hojo, Yuichi Ikuhara, Masaki AzumaAbstract:Polarization Rotation induced by an external electric field in piezoelectric materials such as PbZr1-x Tix O3 is generally regarded as the origin of their large piezoelectric responses. Here, the piezoelectric responses of high-quality cobalt-substituted BiFeO3 epitaxial thin films with monoclinic distortions are systematically examined. It is demonstrated that Polarization Rotation plays a crucial role in improving the piezoelectric responses in this material.
Chunrong Luo - One of the best experts on this subject based on the ideXlab platform.
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Planar composite chiral metamaterial with broadband dispersionless Polarization Rotation and high transmission
Journal of Applied Physics, 2016Co-Authors: Kun Song, Xiaopeng Zhao, Yahong Liu, Chunrong Luo, Changlin Ding, Khagendra Bhattarai, Jiangfeng ZhouAbstract:We propose a planar composite chiral metamaterial (CCMM) by symmetrically inserting a metallic mesh between two layers of conjugated gammadion resonators. As the elaborate CCMM operates at off-resonance frequencies, it therefore presents low-loss and low-dispersion Polarization Rotation features. The results show that the proposed CCMM can achieve pure and dispersionless Polarization Rotation with efficient transmission for a linearly polarized wave within a broad bandwidth. This off-resonance CCMM overcomes the drawbacks of high transmission losses and highly dispersive Polarization Rotation that exist in the previous resonance-type chiral metamaterials and also exhibits more simplicity of fabrication than the three-dimensional CMMs. The intriguing properties greatly improve the performance of chiral metamaterials in controlling the Polarization state of electromagnetic waves.
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Broadband dispersionless Polarization Rotation with composite chiral metamaterials
arXiv: Optics, 2015Co-Authors: Kun Song, Yahong Liu, Chunrong Luo, Changlin Ding, Xiaopeng ZhaoAbstract:We propose a planar composite chiral metamaterial (CCMM) by symmetrically inserting a metallic mesh between two layers of conjugated gammadion resonators. As the elaborate CCMM operates in the frequency region of off-resonance, it therefore presents loss-less and dispersion-free features. It can achieve flat Polarization Rotation simultaneously accompanied with high transmission and extremely low ellipticity in a broad bandwidth. In the meanwhile, this intriguing CCMM shows more superiorities in Polarization Rotation power and operating bandwidth than the pure chiral metamaterial just composed of conjugated gammadions. Due to the fascinating properties, the proposed CCMM is greatly appealing for controlling the Polarization state of the electromagnetic waves.
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a frequency tunable 90 Polarization Rotation device using composite chiral metamaterials
Applied Physics Letters, 2013Co-Authors: Kun Song, Xiaopeng Zhao, Yahong Liu, Chunrong LuoAbstract:The electromagnetic behaviors of the metamaterial can be artificially controlled by changing the effective permittivity of the nearby background medium. Utilizing this fantastic feature, an ultrathin and frequency-tunable Polarization Rotation device, which can achieve 90° Polarization Rotation for a linearly polarized incident wave, is constructed via the combination of a composite chiral metamaterial and two auxiliary dielectric slabs. It shows that the operating frequency of the resulting 90°-Polarization Rotation device can be continuously and reversibly tuned in a wide frequency range by mechanical means. The experimentally measured results are in agreement with the numerical values.
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A frequency-tunable 90°-Polarization Rotation device using composite chiral metamaterials
Applied Physics Letters, 2013Co-Authors: Kun Song, Xiaopeng Zhao, Yahong Liu, Chunrong LuoAbstract:The electromagnetic behaviors of the metamaterial can be artificially controlled by changing the effective permittivity of the nearby background medium. Utilizing this fantastic feature, an ultrathin and frequency-tunable Polarization Rotation device, which can achieve 90° Polarization Rotation for a linearly polarized incident wave, is constructed via the combination of a composite chiral metamaterial and two auxiliary dielectric slabs. It shows that the operating frequency of the resulting 90°-Polarization Rotation device can be continuously and reversibly tuned in a wide frequency range by mechanical means. The experimentally measured results are in agreement with the numerical values.
Yosuke Onawa - One of the best experts on this subject based on the ideXlab platform.
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Silicon Waveguide Contradirectional Coupler Polarization Rotation Bragg Grating
2020 IEEE Photonics Conference (IPC), 2020Co-Authors: Hideaki Okayama, Yosuke Onawa, Hiroyuki Takahashi, Daisuke Shimura, Hiroki Yaegashi, Hironori SasakiAbstract:We report contra-directional coupler type Polarization Rotation Bragg gratings using silicon waveguides. Waveguides incorporating a Bragg grating for Polarization Rotation and having different widths are placed near to each other. A single grating can separate the backward diffraction light. The diffracted backward Polarization rotated light is separated from the input port without using any other element. A distinct Polarization rotated wavelength peak was observed at the backward drop port of fabricated device.
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OECC/PSC - Silicon waveguide Polarization Rotation Bragg grating using directional coupling
2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC), 2019Co-Authors: Hideaki Okayama, Yosuke Onawa, Hiroyuki Takahashi, Daisuke Shimura, Hiroki Yaegashi, Hironori SasakiAbstract:We report directional coupler type Polarization Rotation Bragg gratings using silicon waveguides. Waveguides with Bragg grating for Polarization Rotation and having different widths are placed near to each other. Two types of devices are reported in this presentation.
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Polarization Rotation Bragg diffraction using Si wire waveguide grating and Polarization rotator.
Optics express, 2015Co-Authors: Hideaki Okayama, Yosuke Onawa, Daisuke Shimura, Hiroki Yaegashi, Hironori SasakiAbstract:We report Polarization independent Bragg grating wavelength filter with high diffraction efficiency. A rib waveguide Polarization rotator and antisymmetric grating structure for fundamental to first order diffraction are used to generate the Polarization Rotation Bragg diffraction. The diffraction efficiencies and peak wavelengths become the same for two orthogonal input Polarizations. Strong diffraction is attained easily. The concept was verified by simulation and experiment. Polarization independent band-pass filter consisting of Polarization beam splitter and Polarization Rotation Bragg diffraction was experimentally demonstrated.
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Polarization Rotation Bragg grating using Si wire waveguide with non-vertical sidewall
Optics express, 2014Co-Authors: Hideaki Okayama, Yosuke Onawa, Daisuke Shimura, Hiroki Yaegashi, Hironori SasakiAbstract:We report Polarization independent Bragg grating wavelength filter using Polarization Rotation. A non-vertical waveguide sidewall and antisymmetric grating structure can be used to generate the Polarization Rotation of the fundamental modes. The diffraction efficiencies and peaks becomes the same for two orthogonal input Polarizations. The concept was verified by simulation and experiment.
