Results 1 to 10 of about 128,599 (282)
An ultrahigh-resolution spectrometer using parallel double gratings
Results in Physics, 2023 This paper describes a Parallel-Double-Grating Spectrometer (PDGS) with ultrahigh resolution. Two plane reflection gratings are placed in parallel and staggered to form a dispersive component, through which the light passes multiple times, which greatly ...
Jun Chen +6 more
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Light-Driven Pitch Tuning of Self-Assembled Hierarchical Gratings
Crystals, 2021 Gratings are of vital importance in modern optics. Self-assembled cholesteric liquid crystal (CLC) gratings have attracted intensive attention due to their easy fabrication and broad applications.
Yuan-Hang Wu +7 more
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Optics Express, 2023 We propose the concept of a Dirac grating, where periodic permittivity perturbations approach a train of Dirac functions. We show that Dirac gratings can yield identical spectral characteristics for higher-order gratings compared to first-order gratings of the same length. Using an inverse Fourier transform technique, we design different types of Dirac
Saeidi, Shayan +3 more
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Analysis of First-Order Gratings in Silicon Photonic Waveguides
IEEE Photonics Journal, 2022 A simple thin film effective index analysis for first-order gratings in Si photonic waveguides is shown to provide highly accurate results for reflected and transmitted power spectrums as long as the waveguide remains single mode and non-radiating.
Haosen Tan +8 more
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Polarization independent Bragg gratings using tilted subwavelength grating waveguide Bragg gratings
Optics Express, 2023 We propose and experimentally demonstrate a polarization independent subwavelength grating (SWG) waveguide Bragg grating (WBG) by using an SWG waveguide with tilted segments. By optimizing the tilting angle and other geometry parameters, such as the width and the length of the loading segments used to create the BG, we can obtain a zero birefringence ...
Hao Sun, Lawrence R. Chen
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International Journal of Smart and Nano Materials, 2023 For single-walled carbon nanotubes (SWCNTs) with a length of 1–50 µm, the surface plasmon-polariton (SPP) resonance is within the terahertz frequency range; therefore, SWCNT lattices can be used to design frequency-selective surface (FSS).
Pavel Evgenjevich Timoshenko +2 more
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Photonic Sensors, 2019 To obtain a good interference fringe contrast and high fidelity, an automated beam iterative alignment is achieved in scanning beam interference lithography (SBIL).
Ying Song +4 more
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Comparison and analysis of wavelength calibration methods for prism – Grating imaging spectrometer
Results in Physics, 2019 To identify spectral information obtained from the prism - grating imaging spectrometer, it is essential to know the center wavelength for each spectral channel.
Ci Sun +4 more
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Theory of strong coupling between molecules and surface plasmons on a grating
Nanophotonics, 2022 The strong coupling of molecules with surface plasmons results in hybrid states which are part molecule, part surface-bound light. Since molecular resonances may acquire the spatial coherence of plasmons, which have mm-scale propagation lengths, strong ...
Rider Marie S. +3 more
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Results in Physics, 2023 A conical-diffraction-based cross-dispersed spatial heterodyne spectrometer (CDCDSHS) is presented. Conical diffraction is introduced, and one grating in the SHS is rolled around the central normal of its surface to expand the spectral range.
Qihang Chu +5 more
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