High-contrast grating
Web30 de jan. de 2024 · A high-contrast grating (HCG) is a label-free optical biosensor with a spectral linewidth of approximately 500 pm and is sensitive to ligand-induced changes in surface properties . The small footprint and high efficiency of an HCG structure can be suitable for wavelength conversion in chip-scale integrated optics. In physics, a high contrast grating is a single layer near-wavelength grating physical structure where the grating material has a large contrast in index of refraction with its surroundings. The term near-wavelength refers to the grating period, which has a value between one optical wavelength in the … Ver mais The concept of high contrast grating took off with a report on a broadband high reflectivity reflector for surface-normal incident light (the ratio between the wavelength bandwidth with a reflectivity larger than 0.99 and … Ver mais Fully rigorous electromagnetic solutions exist for gratings, which tends to involve heavy mathematical formulism. A simple analytical formulism … Ver mais High contrast gratings have been employed in many optoelectronic devices. It has been incorporated as the mirrors for vertical-cavity … Ver mais
High-contrast grating
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WebThe improvements due to small incision lenticule extraction (SMILE) in vision, e.g., in spherical equivalent (SE) and visual acuity (VA), has been widely recognized. However, the contrast sensitivity (CS) change after SMILE was not certain. Here, we investigated the effect of SMILE on CS before, 1 day after and 7 days after surgery and then clarified the … Web2 de ago. de 2010 · A simple analytic analysis of the ultra-high reflectivity feature of subwavelength dielectric gratings is developed. The phenomenon of ultra high reflectivity …
WebHá 1 hora · Background The differentiation of minimal-fat—or low-fat—angiomyolipomas from other renal lesions is clinically challenging in conventional computed tomography. In this work, we have assessed the potential of grating-based x-ray phase-contrast computed tomography (GBPC-CT) for visualization and quantitative differentiation of minimal-fat …
Web1 de jul. de 2009 · High-contrast grating (HCG) has significant advantages in efficient light modulation due to the high refractive index contrast of the materials, it has been widely … http://nanophotonics.eecs.berkeley.edu/Publications/Conference/files/1086/Megens%20et%20al.%20-%202414%20-%20High-contrast%20grating%20MEMS%20optical%20phase-shifters%20.pdf
Web29 de set. de 2009 · High-Index-Contrast Grating (HCG) and Its Applications in Optoelectronic Devices Abstract: We review recent advances in subwavelength high …
Web16 de fev. de 2016 · Apart from the MGs, high-contrast gratings (HCGs) consisting of Bragg stack of high-index and low-index material blocks with subwavelength thicknesses have been widely studied in recent years 21 ... cool runnings alstonvilleWeb12 de jan. de 2024 · These high-contrast gratings (HCGs) with a period smaller than the optical wavelength harness a special reflection mechanism 30,31 based on the … family tartan for fulfordWeb29 de ago. de 2024 · The high index contrast subwavelength grating has a large reflection bandwidth up to 97 nm with good polarization selectivity, and exhibits large tolerance in preparation, which makes it easier to integrate with the VCSEL. What’s more, its sensitivity to angle of incidences facilitates the single-mode VCSELs’ implement. family tartan given during a weddingWeb15 de mai. de 2016 · The proposed metasurfaces are designed using GaN HCGs, which are subwavelength gratings comprised of high index GaN bars completely surrounded by low refractive index materials (e.g. air).Taking a GaN-HCG lens as an example, the schematic HCG metasurface geometry is shown in Fig. 1 (a). Grating period (P), grating thickness … family tartan by nameWeb16 de fev. de 2016 · Zhou, Y. et al. High-Index-Contrast Grating (HCG) and Its Applications in Optoelectronic Devices. IEEE J. Sel. Top. Quantum Electron. 15, 1485–1489 (2009). Article ADS CAS Google Scholar family tartan fabricWebcreation of coupled cavity systems.7 However, HCGs make use of high-index-contrast to achieve high re ectance; they are often surrounded by air and require relatively complex fabrication processes to remove the sacri cial layer under the HCG layer.1 Suspended, they are susceptible to vibrational instability,8 ine cient in heat dissipation, and ... cool runnings bad mother quoteWeb18 de abr. de 2024 · In this work, we present a theoretical study on using high contrast grating (HCG) designs to enhance light–gas interaction in the mid-infrared range. The optical behavior of a single layer HCG was studied under the presence of CO 2 gas. Through optimizing the structure parameters, we could confine an intense electric field … family tartan ireland