«diffraction grating»
۲۵۶۰ نتیجه3D printed terahertz diffraction gratings and lenses
3D printing opens up an inexpensive, rapid, and versatile path to the fabrication of optical elements suited to the terahertz regime. The transmission of the plastics used in 3D printers, while generally decreasing with frequency, is usable over the range 0.1-2 THz. We have desig
MEMS Tunable Diffraction Grating for Spaceborne Imaging Spectroscopic Applications
Diffraction gratings are among the most commonly used optical elements in applications ranging from spectroscopy and metrology to lasers. Numerous methods have been adopted for the fabrication of gratings, including microelectromechanical system (MEMS) fabrication which is by now
A compact lens-less optical image encoding system using diffraction grating
A method for a compact lens-less image encoding system using diffraction grating and random phase masks is presented. Lensless double phase encoding is implemented using diffraction grating. The Beam Propagation Method (BPM) is used to analyze optical waveguide grating. The phase
A conceptual model of the diffuse transmittance of lamellar diffraction gratings on solar cells
Diffraction gratings are effective ways of increasing the light absorption of solar cells and the light extraction of light-emitting diodes. In this paper, we show that simplified modal analysis can be used as a conceptual model for understanding the behavior of the diffuse trans
A Nyström Method for a Class of Integral Equations on the Real Line with Applica- Tions to Scattering by Diffraction Gratings and Rough Surfaces
We propose a Nyström/product integration method for a class of second kind integral equations on the real line which arise in problems of two-dimensional scalar and elastic wave scattering by unbounded surfaces. Stability and convergence of the method is established with converge
Design, fabrication, and characterization of diffraction gratings for neutron phase contrast imaging.
We have developed a neutron phase contrast imaging method based on a grating interferometer setup. The principal constituents are two absorption gratings made of gadolinium and a phase modulating grating made of silicon. The design parameters of the setup, such as periodicity, st
Label-free detection of real-time DNA amplification using a nanofluidic diffraction grating
Quantitative DNA amplification using fluorescence labeling has played an important role in the recent, rapid progress of basic medical and molecular biological research. Here we report a label-free detection of real-time DNA amplification using a nanofluidic diffraction grating.
High efficiency diffractive grating coupler based on transferred silicon nanomembrane overlay on photonic waveguide
We report here the design of a new type of high efficiency grating coupler, based on single crystalline Si nanomembrane overlay and stacking. Such high efficiency diffractive grating couplers are designed for the purpose of coupling light between single mode fibres and nanophoton
Rayleigh–Bloch waves along elastic diffraction gratings
Rayleigh-Bloch (RB) waves in elasticity, in contrast to those in scalar wave systems, appear to have had little attention. Despite the importance of RB waves in applications, their connections to trapped modes and the ubiquitous nature of diffraction gratings, there has been no i
The Influence of the Inter-pixel Region in Liquid Crystal Diffraction Gratings
An important problem associated with multiple pixel liquid crystal (LC) modulators is the incidental diffraction due to amplitude and phase gratings formed by the improperly modulated regions between electrodes. This problem becomes more of an issue as the resolution of the SLM i