The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Victor Ya Zyryanov - One of the best experts on this subject based on the ideXlab platform.
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Photo-manipulated photonic bandgap devices based on optically tristable chiral-tilted homeotropic nematic liquid crystal
2020Co-Authors: Huang Kuan-chung, Victor Ya Zyryanov, Hsiao Yu-cheng, Timofeev Ivan, Lee WeiAbstract:We report on the spectral properties of an optically switchable tristable chiral-tilted homeotropic nematic liquid crystal (LC) incorporated as a tunable Defect Layer in one- dimensional photonic crystal. By varying the polarization angle of the incident light and modulating the light intensity ratio between UV and green light, various transmission characteristics of the composite were obtained. The hybrid structure realizes photo-tunability in transmission of Defect-mode peaks within the photonic bandgap in addition to optical switchability among three distinct sets of Defect modes via photoinduced tristable state transitions. Because the fabrication process is easier and less critical in terms of cell parameters or sample preparation conditions and the LC Layer itself possesses an extra stable state compared with the previously reported bistable counterpart operating on the basis of biased-voltage dual-frequency switching, it has much superior potential for photonic applications such as a low-power-consumption multichannel filter and an optically controllable intensity modulator
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voltage induced Defect mode coupling in a one dimensional photonic crystal with a twisted nematic Defect Layer
Physical Review E, 2012Co-Authors: I V Timofeev, V. A. Gunyakov, Sergey A. Myslivets, V. G. Arkhipkin, Wei Lee, Yu Ting Lin, Stepan Ya Vetrov, Victor Ya ZyryanovAbstract:Defect modes are investigated in a band gap of an electrically tunable one-dimensional photonic crystal infiltrated with a twisted-nematic liquid crystal. Their frequency shift and interference under applied voltage are studied both experimentally and theoretically. We deal with the case where the Defect Layer thickness is much larger than the wavelength (i.e., the Mauguin condition). It is shown theoretically that the Defect modes could have a complex structure with elliptic polarization. Two series of polarized modes are coupled with each other and exhibit an avoided crossing phenomenon in the case of opposite parity.
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magnetic field tunable Defect modes in a photonic crystal liquid crystal cell
Optics Express, 2010Co-Authors: Victor Ya Zyryanov, V. A. Gunyakov, Sergey A. Myslivets, V. G. Arkhipkin, A M Parshin, Vasily F ShabanovAbstract:Light transmission spectrum of a multiLayer photonic crystal with a central liquid-crystal Defect Layer placed between crossed polarizers has been studied. Transmittance was varied due to the magnetically induced reorientation of the nematic director from homeotropic to planar alignment. Two notable effects were observed for this scheme: the spectral shift of Defect modes corresponding to the extraordinary light wave and its superposition with the ordinary one. As a result, the optical cell allows controlling the intensity of interfering Defect modes by applied magnetic field.
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Optical properties of one-dimensional photonic crystal with a twisted-nematic Defect Layer.
Optics express, 2010Co-Authors: Y Y Lin, Chong-Yin Wu, W. K. Chang, Victor Ya Zyryanov, Wei LeeAbstract:Spectral properties of an electrically tunable one-dimensional photonic crystal infiltrated with a twisted-nematic liquid crystal (PC/TN) are investigated. Two mesogenic materials with dissimilar optical anisotropies are examined for constituting the central Defect Layer. With the TN alignment of the Defect Layer embedded in the dielectric multiLayers, the Defect modes not only shift with the applied voltage but also switch between two major modes when the linear polarization angle of the incident light is altered. The superposition of the mixed-mode TN (MTN) and the photonic bandgap brings out a tremendous undulation in all range of the transmission spectrum. The Defect modes falling at the centers of the MTN spectral humps are allowed to intensely transmit while the others are suppressed. As a result, we propose a monochromatic selector constructed by such a PC/MTN device with electrical tunability.
Wei Lee - One of the best experts on this subject based on the ideXlab platform.
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voltage induced Defect mode coupling in a one dimensional photonic crystal with a twisted nematic Defect Layer
Physical Review E, 2012Co-Authors: I V Timofeev, V. A. Gunyakov, Sergey A. Myslivets, V. G. Arkhipkin, Wei Lee, Yu Ting Lin, Stepan Ya Vetrov, Victor Ya ZyryanovAbstract:Defect modes are investigated in a band gap of an electrically tunable one-dimensional photonic crystal infiltrated with a twisted-nematic liquid crystal. Their frequency shift and interference under applied voltage are studied both experimentally and theoretically. We deal with the case where the Defect Layer thickness is much larger than the wavelength (i.e., the Mauguin condition). It is shown theoretically that the Defect modes could have a complex structure with elliptic polarization. Two series of polarized modes are coupled with each other and exhibit an avoided crossing phenomenon in the case of opposite parity.
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Optical properties of one-dimensional photonic crystal with a twisted-nematic Defect Layer.
Optics express, 2010Co-Authors: Y Y Lin, Chong-Yin Wu, W. K. Chang, Victor Ya Zyryanov, Wei LeeAbstract:Spectral properties of an electrically tunable one-dimensional photonic crystal infiltrated with a twisted-nematic liquid crystal (PC/TN) are investigated. Two mesogenic materials with dissimilar optical anisotropies are examined for constituting the central Defect Layer. With the TN alignment of the Defect Layer embedded in the dielectric multiLayers, the Defect modes not only shift with the applied voltage but also switch between two major modes when the linear polarization angle of the incident light is altered. The superposition of the mixed-mode TN (MTN) and the photonic bandgap brings out a tremendous undulation in all range of the transmission spectrum. The Defect modes falling at the centers of the MTN spectral humps are allowed to intensely transmit while the others are suppressed. As a result, we propose a monochromatic selector constructed by such a PC/MTN device with electrical tunability.
Katsumi Yoshino - One of the best experts on this subject based on the ideXlab platform.
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electrically tunable lasing based on Defect mode in one dimensional photonic crystal with conducting polymer and liquid crystal Defect Layer
Applied Physics Letters, 2004Co-Authors: Ryotaro Ozaki, Masanori Ozaki, Yuko Matsuhisa, Katsumi YoshinoAbstract:Electrical tuning of the wavelength of the Defect mode lasing in a one-dimensional photonic crystal has been demonstrated using a conducting polymer as an active emission Layer and a nematic liquid crystal as an electrically tunable Defect Layer in the periodic structure. Lasing wavelength is widely tuned upon applying the electric field, which follows a Defect mode shift due to the refractive index change in the nematic liquid crystal Defect Layer caused by field-induced realignment of the liquid crystal molecules.
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electrically color tunable Defect mode lasing in one dimensional photonic band gap system containing liquid crystal
Applied Physics Letters, 2003Co-Authors: Ryotaro Ozaki, Tatsunosuke Matsui, Masanori Ozaki, Katsumi YoshinoAbstract:Electrical tuning of the wavelength of the Defect-mode lasing in a one-dimensional periodic structure has been demonstrated using a dye-doped nematic liquid crystal as a Defect Layer in the periodic structure. Lasing wavelength is widely tuned upon applying an electric field, which is due to the refractive index change in the Defect Layer caused by the field-induced realignment of the liquid crystal molecules.
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electro tunable Defect mode in one dimensional periodic structure containing nematic liquid crystal as a Defect Layer
Japanese Journal of Applied Physics, 2002Co-Authors: Ryotaro Ozaki, Tatsunosuke Matsui, Masanori Ozaki, Katsumi YoshinoAbstract:Electrical tuning of Defect modes in a one-dimensional periodic structure has been demonstrated using a nematic liquid crystal as a Defect Layer in the periodic structure. The wavelength of the Defect mode shifts upon applying the electric field, which is due to the refractive index change in the Defect Layer caused by the field-induced realignment of the liquid crystal molecules. The theoretical calculation based on a simple transfer matrix has been carried out, and the result has been found to agree with the experimental result.
Andre Anders - One of the best experts on this subject based on the ideXlab platform.
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All-solid-state tunable Bragg filters based on a phase transition material
Conference on Lasers and Electro-Optics, 2017Co-Authors: Xi Wang, Zilun Gong, Kaichen Dong, J Slack, Andre Anders, Shuai Lou, Jie YaoAbstract:We demonstrate an all-solid-state tunable Bragg filter with a phase transition material as the Defect Layer. Dynamic tunability and hysteresis properties of the Bragg filter promise more applications by combining phase transition materials and optical cavities.
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tunable bragg filters with a phase transition material Defect Layer
Optics Express, 2016Co-Authors: Xi Wang, Zilun Gong, Kaichen Dong, J Slack, Andre AndersAbstract:We propose an all-solid-state tunable Bragg filter with a phase transition material as the Defect Layer. Bragg filters based on a vanadium dioxide Defect Layer sandwiched between silicon dioxide/titanium dioxide Bragg gratings are experimentally demonstrated. Temperature dependent reflection spectroscopy shows the dynamic tunability and hysteresis properties of the Bragg filter. Temperature dependent Raman spectroscopy reveals the connection between the tunability and the phase transition of the vanadium dioxide Defect Layer. This work paves a new avenue in tunable Bragg filter designs and promises more applications by combining phase transition materials and optical cavities.
Masanori Ozaki - One of the best experts on this subject based on the ideXlab platform.
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tunable terahertz filter using an etalon with a nematic liquid crystal Layer and its response speed
Molecular Crystals and Liquid Crystals, 2012Co-Authors: Takayuki Kumagai, Ryouta Ito, Kei Takeya, Hiroyuki Yoshida, Hitoshi Kubo, Akihiko Fujii, Toshiaki Nose, Masayoshi Tonouchi, Masanori OzakiAbstract:We demonstrate a tunable terahertz (THz) filter using an etalon with a nematic liquid crystal (NLC) Layer. The etalon is composed of water-free fused silica glass plates and air Layers, and contains a 75 μm-thick Defect Layer filled with homeotropically-aligned NLCs. Frequency tuning of the transmission peak is achieved by applying an in-plane electric field across the NLC Layer: the transmission peak shifts from 1.025 THz to 1.013 THz. The obtained rise and decay times are 5.3 s and 12.2 s respectively and found to be 10 times faster than previous THz LC devices because of the thin NLC Layer.
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electrically tunable lasing based on Defect mode in one dimensional photonic crystal with conducting polymer and liquid crystal Defect Layer
Applied Physics Letters, 2004Co-Authors: Ryotaro Ozaki, Masanori Ozaki, Yuko Matsuhisa, Katsumi YoshinoAbstract:Electrical tuning of the wavelength of the Defect mode lasing in a one-dimensional photonic crystal has been demonstrated using a conducting polymer as an active emission Layer and a nematic liquid crystal as an electrically tunable Defect Layer in the periodic structure. Lasing wavelength is widely tuned upon applying the electric field, which follows a Defect mode shift due to the refractive index change in the nematic liquid crystal Defect Layer caused by field-induced realignment of the liquid crystal molecules.
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electrically color tunable Defect mode lasing in one dimensional photonic band gap system containing liquid crystal
Applied Physics Letters, 2003Co-Authors: Ryotaro Ozaki, Tatsunosuke Matsui, Masanori Ozaki, Katsumi YoshinoAbstract:Electrical tuning of the wavelength of the Defect-mode lasing in a one-dimensional periodic structure has been demonstrated using a dye-doped nematic liquid crystal as a Defect Layer in the periodic structure. Lasing wavelength is widely tuned upon applying an electric field, which is due to the refractive index change in the Defect Layer caused by the field-induced realignment of the liquid crystal molecules.
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electro tunable Defect mode in one dimensional periodic structure containing nematic liquid crystal as a Defect Layer
Japanese Journal of Applied Physics, 2002Co-Authors: Ryotaro Ozaki, Tatsunosuke Matsui, Masanori Ozaki, Katsumi YoshinoAbstract:Electrical tuning of Defect modes in a one-dimensional periodic structure has been demonstrated using a nematic liquid crystal as a Defect Layer in the periodic structure. The wavelength of the Defect mode shifts upon applying the electric field, which is due to the refractive index change in the Defect Layer caused by the field-induced realignment of the liquid crystal molecules. The theoretical calculation based on a simple transfer matrix has been carried out, and the result has been found to agree with the experimental result.
