The Experts below are selected from a list of 27687 Experts worldwide ranked by ideXlab platform
Feng Chen - One of the best experts on this subject based on the ideXlab platform.
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Ridge Waveguides and Y-Branch Beam Splitters in KTiOAsO4 Crystal by 15 MeV Oxygen Ion Implantation and Femtosecond Laser Ablation
Journal of Lightwave Technology, 2017Co-Authors: Chen Chen, Carolina Romero, Javier Vazquez R De Aldana, Shavkat Akhmadaliev, Shengqiang Zhou, Feng ChenAbstract:We report on the fabrication of ridge waveguides and Y-branch Beam Splitters in KTiOAsO4 nonlinear optical crystal by the combination of 15 MeV oxygen (O5+) ion implantation and femtosecond laser ablation. Guiding properties were investigated at the wavelengths of 633 and 808 nm, respectively, showing high polarization sensitivity of light propagation. Splitting ratios of these Beam Splitters are dependent on in-coupling alignment. The simulated guiding modal distributions of splitted guided Beams, which was based on a reconstructed refractive index profile, shows reasonable consistence with the measured ones. After the stepwise annealing treatment at 473 and 573 K for 1 h each, the propagation losses for these guiding structures have been reduced considerably.
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three dimensional femtosecond laser fabrication of waveguide Beam Splitters in linbo 3 crystal
Optical Materials Express, 2015Co-Authors: Yazhou Cheng, Weihao Yuan, Xiaotao Hao, Feng ChenAbstract:We report on the fabrication of waveguide Beam Splitters in z-cut LiNbO3 crystal by direct femtosecond laser writing. The guidance is valid only for TM polarization due to the Type I modification of extraordinary refractive index (ne) induced by femtosecond laser pulses. With single scan of femtosecond laser Beams over the crystal bulk, the structures with channel geometry have been produced. In this work, such waveguide configurations were created as one-dimensional (1D) straight waveguide, two-dimensional (2D) 1 × 2 and three-dimensional (3D) 1 × 4 waveguide Beam Splitters. The waveguide Beam Splitters are characterized at the wavelength of 632.8 nm and 1064 nm both experimentally and numerically. This work opens the way for laser-written 3D LiNbO3 waveguide Beam Splitters as novel 3D nonlinear photonic devices.
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three dimensional dielectric crystalline waveguide Beam Splitters in mid infrared band by direct femtosecond laser writing
Optics Express, 2014Co-Authors: Irene Hernandezpalmero, Carolina Romero, Javier Vazquez R De Aldana, Feng ChenAbstract:We report on the fabrication of three-dimensional waveguide Beam Splitters in a dielectric Bi4Ge3O12 (BGO) crystal by direct femtosecond laser writing. In the laser written tracks of BGO crystal, positive refractive index is induced, resulting in so-called Type I configuration waveguiding cores. The “multiscan” technique is utilized to shape cores with designed cross-sectional geometry in order to achieve guidance at mid-infrared wavelength of 4 μm. The fundamental mode guidance along both TE and TM polarizations has been obtained in the waveguide structures. With this feature, we implement Beam Splitters from 2D to 3D geometries, and realize 1 × 2, 1 × 3, and 1 × 4 power splitting at 4μm.
Hitoshi Abe - One of the best experts on this subject based on the ideXlab platform.
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Idea of thin-film Beam Splitters for two-colour Beamlines.
Journal of Synchrotron Radiation, 2019Co-Authors: Hitoshi AbeAbstract:The idea to split soft X-ray and hard X-ray Beams on the same axis into different directions is presented. A thin-film Beam splitter can serve this purpose. Performances of thin-film Beam Splitters made of carbon and aluminium were examined. The idea of thin-film Beam Splitters expands possibilities in the design of two-colour Beamlines.
Martin Koch - One of the best experts on this subject based on the ideXlab platform.
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Broadband antireflection coating for optimized terahertz Beam Splitters
Optical Materials Express, 2015Co-Authors: Weien Lai, Norman Born, Lorenz Maximilian Schneider, Arash Rahimi-iman, Jan C. Balzer, Martin KochAbstract:We investigate the potential of anti-ferromagnetic nanofilms as broadband antireflection coatings in the terahertz frequency range. The anti-ferromagnetic layer is modeled by an analytic wave-impedance matching approach. The experimental results of the transmission and reflection measurements demonstrate the effectiveness of our antireflection coatings. Furthermore, we use anti-ferromagnetic nanofilms as antireflection coating for a terahertz Beam splitter. Compared with conventional terahertz Beam Splitters consisting of an uncoated thick silicon wafer, the coated silicon Beam splitter has two advantages: elimination of multiple reflections and improvement of the signal-to-noise ratio for terahertz time-domain spectroscopy in reflection geometry.
Sung Chang Kim - One of the best experts on this subject based on the ideXlab platform.
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Polarization-Insensitive Optical Receiver Module Based on Thin-Film Beam Splitters
IEEE Photonics Technology Letters, 2020Co-Authors: Kyeeun Kim, Hyun Seo Kang, Youngsoon Heo, Siwoong Park, Hyunwoong Yeom, Sung Chang KimAbstract:Optical receiver modules play an important role in receiving signals from the Fiber Bragg Grating (FBG) sensors used for monitoring in civil structures, power facilities, and other sensing applications. When multiple sensors are used, more photo diodes receive optical signals; thin-film Beam Splitters with polarization characteristics are therefore used to reduce the size of the optical receiver module. Using a reflective semiconductor optical amplifier (R-SOA) with polarization characteristics in a sensing system with an FBG sensor, a structure that is less sensitive to polarization was developed by packaging a quad optical receiver module. A stabilization of ±4.67% was achieved using the dual optical receiver module in polarization and of ±1.20% with the quad optical receiver module in polarization.
L G Herrmann - One of the best experts on this subject based on the ideXlab platform.
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carbon nanotubes as cooper pair Beam Splitters
Physical Review Letters, 2010Co-Authors: L G Herrmann, F Portier, P Roche, Levy A Yeyati, Takis Kontos, Christoph StrunkAbstract:We report on conductance measurements in carbon nanotube based double quantum dots connected to two normal electrodes and a central superconducting finger. By operating our devices as Beam Splitters, we provide evidence for crossed Andreev reflections tunable in situ. This opens an avenue to more sophisticated quantum opticslike experiments with spin entangled electrons.