Results 31 to 40 of about 2,028 (199)
Journal of the European Optical Society-Rapid Publications, 2023 We report on subwavelength reflective gratings for hyperspectral applications operating in a very large spectral band (340–1040 nm). Our study concerns a blazed-binary grating having a period of 30 μm and composed of 2D subwavelength structures with size
Lee Mane-Si Laure +11 more
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Results in Physics, 2020 Blaze angle is definitely a crucial parameter of blazed transmission gratings, which significantly affects the diffraction efficiency of gratings. In this paper, we observed a phenomenon that total reflection causes the grating energy distribution to ...
Xiang Zhang +6 more
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Modelling adapted to manufacturing aspects of holographic grating structures [PDF]
Journal of the European Optical Society-Rapid Publications, 2011 The diffraction efficiencies of modified sinusoidal and blazed gratings are investigated in the high spatial frequency regime by rigorous numerical methods and are compared to experimentally manufactured gratings. The introduced modifications take actual
Sandfuchs O. +5 more
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Terahertz Beam Steering Concept Based on a MEMS-Reconfigurable Reflection Grating
Sensors, 2020 With an increasing number of applications of terahertz systems in industrial fields and communications, terahertz beamforming and beam steering techniques are required for high-speed, large-area scanning.
Xuan Liu +6 more
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Blazed Diffraction Gratings on Si—First Results
Technical Physics, 2022 Using direct laser lithography and wet etching of polished vicinal Si(111) wafers, a technology was developed and diffraction gratings 500 grooves/mm with a blaze angle of 4o were fabricated. The manufacturing process of a reflective Si-grating with the triangular profile (sawtooth) can be divided into four main steps: (1) obtaining a pattern of a
null Dashkov A. S. +6 more
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Perfect Chirped Echelle Grating Wavelength Multiplexor: Design and Optimization
IEEE Photonics Journal, 2013 A new method for designing an echelle-type diffraction grating for wavelength division multiplexing (WDM), which is tuned to a single stigmatic point, is introduced.
Richard J. Lycett +2 more
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Design of MIR Dispersive Spectrograph System with Uncooled Microbolometer
Sensors, 2023 To make the mid-infrared (MIR) dispersive spectrograph a practical tool in industrial food processing lines, we designed a dispersive spectrograph system with an uncooled microbolometer focal plane array (FPA) detector for MIR spectral acquisition.
Pattarapong Sunongbua +2 more
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IEEE Photonics Journal, 2016 We demonstrate a thulium-doped fiber ring laser (TDFRL) integrated with an amplifier, which has a watt-level single-frequency output at 2 $\mu\text{m}$ with a 120-nm wavelength tunability. The TDFRL is constructed based on a hybrid ring-linear resonator
Sun Do Lim, Jae-Keun Yoo, Seung Kwan Kim
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2-D Grating Couplers for Vertical Fiber Coupling in Two Polarizations
IEEE Photonics Journal, 2019 We demonstrate highly efficient couplers in a two-dimensional grating configuration for a vertical fiber-coupling fabricated in the silicon-on-insulator platform.
Tatsuhiko Watanabe +2 more
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Design of high-efficiency all-dielectric polymer meta-surfaces beam deflection blazed grating
Results in Physics, 2020 Optical meta-surface element is a kind of two-dimensional ultra-thin device based on the regular arrangement of single-layer or multi-layer sub-wavelength nanostructure array. It can realize the sudden operation of optical amplitude, phase, polarization,
Yiman Wu +8 more
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