Optical directivity
WebM2I.5 Optical Fiber Communication Conference (OFC) 2016. High Efficiency Fiber-to-Waveguide Grating Couplers in Silicon-on-Insulator Waveguide Structures. Günther … WebApr 10, 2024 · Directivity, return loss, surface current distribution, and radiation pattern parameters are assessed and compared to existing designs to show that the developed antenna has a high efficiency. ... Optical and wireless technologies (pp. 491–496). Springer. Chapter Google Scholar
Optical directivity
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WebJun 22, 2024 · A transformation-optical method is presented to enhance the directivity of a cylindrical wire antenna by using an all-dielectric graded index medium. The strictly conformal mapping between two... WebJan 27, 2024 · Optical Directivity Design Using Through-hole Array Silicon Chip Abstract: In this letter, we report a method of designing the optical sensor directivity without using an …
WebSep 29, 2024 · Using conformal transformation optics, a cylindrical shell made of an isotropic refractive index material is designed to improve the directivity of a wire antenna … WebDec 14, 2024 · The directivity refers to the fraction of input light that is lost in the internally terminated fiber end within the coupler housing when port 1 is used as the input. It can …
WebJul 15, 2012 · Optical antennas offer unique possibilities for light manipulation on a sub-wavelength scale. Here, we study log-periodic antennas that exhibit broadband directivity … WebDirectivity: The light reflected from the coupler must be minimal so as not to interfere with the measurement signal. The sources of interference are kept as small as possible. This …
WebAug 21, 2024 · A distributed fiber optic hydrophone (DFOH) is a new type of fiber optic hydrophone (FOH) with adjustable structure. The dependence of the directivity of a DFOH on array structure is theoretically ...
WebAug 10, 2024 · The optical-to-THz conversion process consists of two steps, including photocurrent generation excited by a femtosecond optical pulse, and terahertz generation from the PCA. We numerically studied the two steps with COMSOL Multiphysics and CST respectively, where Maxwell's equations and drift-diffusion model are solved … margery e yuill cancer centreWebSep 12, 2024 · Directivity is ratio of power density in a specified direction to the power density averaged over all directions at the same distance from the antenna. Despite … margery eagan and jim braudeWebDirectivity describes the ratio of light emission in one particular direction to the total over all other directions. It is often useful for emitters to have high directivity so that all of the... kurtos twisted treatsWebAug 27, 2012 · Boosting the directivity of optical antennas with magnetic and electric dipolar resonant particles. B. Rolly, B. Stout, N. Bonod Published 27 August 2012 Physics Optics express Dielectric particles supporting both magnetic and electric Mie resonances are shown to be able to either reflect or collect the light emitted by a single photon source. kurtosh hawthornDirectivity is an important measure because many antennas and optical systems are designed to radiate electromagnetic waves in a single direction or over a narrow-angle. By the principle of reciprocity, the directivity of an antenna when receiving is equal to its directivity when transmitting. See more In electromagnetics, directivity is a parameter of an antenna or optical system which measures the degree to which the radiation emitted is concentrated in a single direction. It is the ratio of the radiation intensity in … See more In an antenna array the directivity is a complicated calculation in the general case. For a linear array the directivity will always be less than … See more The directivity is rarely expressed as the unitless number $${\displaystyle D}$$ but rather as a decibel comparison to a reference antenna: $${\displaystyle D_{\text{dB}}=10\log _{10}\left[{\frac {D}{D_{\text{reference}}}}\right].}$$ The reference antenna is usually the theoretical perfect See more The term directivity is also used with other systems. With directional couplers, directivity is a measure of the … See more The directivity, $${\displaystyle D}$$, of an antenna is defined for all incident angles of an antenna. The term "directive gain" is deprecated by IEEE. If an angle relative to the antenna is not … See more The beam solid angle, represented as $${\displaystyle \Omega _{A}}$$, is defined as the solid angle which all power would flow through … See more When polarization is taken under consideration, three additional measures can be calculated: Partial directive gain Partial directive gain … See more margery eastmanmargery eagan daughter weddingWebJan 21, 2024 · This study considers optical fiber sensors to probe seismic waves. Laser light is emitted into the cable. Processing the signals encoded in the light returning back to the transmitter, we can resolve the effect of seismic waves on the cable. margery eagan wgbh