Results 1 to 10 of about 247,892 (261)
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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EP Europace, 2007 A 72-year-old man presented with advanced symptoms of heart failure due to an idiopathic dilated cardiomyopathy was diagnosed. He presented with sinus rhythm and a left bundle branch block pattern on the electrocardiogram. The echocardiogram showed a severely depressed left ventricular …
Máximo, Rivero-Ayerza +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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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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Generalized Space-Time-Periodic Diffraction Gratings: Theory and Applications [PDF]
Physical Review Applied, 2019 This paper studies the theory and applications of the diffraction of electromagnetic waves by space-time periodic (STP) diffraction gratings. We show that, in contrast with conventional spatially periodic grating, a STP diffraction grating produces ...
S. Taravati, G. Eleftheriades
semanticscholar +1 more source
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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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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