High contrast grating

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August undefined, 2024

Web19 de mai. de 2024 · In this work, we propose and numerically investigate a two-dimensional microlaser based on the concept of bound states in the continuum (BIC). The device … Web26 de mar. de 2024 · Recent progress of vertical-cavity surface-emitting lasers (VCSELs) using high contrast grating (HCG) and their applications will be reviewed. Replacing distributed Bragg reflectors (DBR) with a ultra-thin high contrast grating enables wavelength swept and far field pattern engineering. We will discuss review the basic …

Low-loss optical waveguides made with a high-loss material

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. WebThis paper investigates the optical bound states in the continuum (BIC) supported by a slotted high-contrast grating (sHCG) structure. The sHCG structure consists of a periodic array of silicon ridges with a slot in each ridge. Given that the BICs are perfectly confined, their spectral locations are identified using a finite-element method formulated from a … chisholm free courses

Reflective Optical Phase Modulator Based on High-Contrast Grating …

Web12 de jan. de 2024 · Here, we create on-chip waveguides from pairs of high-index-contrast silicon gratings for lateral confinement by reflection at grazing incidence and a thin … WebHigh contrast gratings (HCGs) are an example of one-dimensional (1D) planar photonic crystals with large refractive index contrast, exhibiting large in-plane scattering even … 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... graphite vinyl

High-contrast grating resonators for label-free detection …

Quasi-BIC laser enabled by high-contrast grating resonator for gas ...

Web13 de jun. de 2024 · Our high-contrast gratings (HCGs) achieve color tunability by changing the wavelength-dependent birefringence via electrodeposited Cu inside the … Webto choose an appropriate waveguide thickness h of for example 220nm. This high efﬁciency grating coupler type is theoretically described in [10] and shows around 80% of coupling ef-ﬁciency according to simulations. Although it requires more process steps than the previous cases, it is compatible with any high index contrast photonic platform. graphite vertalingWeb1 de jul. de 2009 · Abstract and Figures. Recent advances in a single-layer 1-D high-index-contrast subwavelength grating structure are reviewed. Its incorporation into a vertical … graphite vs carbon fishing rods

"Web16 de dez. de 2010 · A new concept of dielectric subwavelength grating has emerged. This grating leverages a high contrast in refractive indices for the grating medium and its surroundings. We will discuss how high-index-contrast grating (HCG) can manipulate light to achieve various extraordinary properties. We will discuss various designs to yield … " - High contrast grating

High contrast grating

Web25 de jan. de 2024 · We propose a heat-reconfigurable metasurface composed of the silicon-based gold grating. The asymmetric Fano-like line shape is formed due to the mutual coupling of the local surface plasmon (LSP) in the gap between the two layers of Au gratings and the surface propagating plasmon (SPP) on the surface of the Au gratings. Then, we … 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 …

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Web2 de ago. de 2010 · The phenomenon of ultra high reflectivity is explained to be a destructive interference effect between the two grating modes. Based on this phenomenon, a design algorithm for broadban … Theoretical analysis of subwavelength high contrast grating reflectors Opt Express. 2010 Aug 2;18(16):16973-88. doi: … WebTo realize quasi-BIC lasing, we selected the grating parameters ( T = 230 nm, F = 0.50, and Λ = 530 nm) which can provide the highest possible reflectivity (as marked in Figure 3 ), …

Web1 de dez. de 2014 · High contrast gratings (HCGs) have emerged as an exciting new tool for achieving optical features such as broadband mirrors, planar lenses, and high quality factor resonators. Of particular use for VCSELs is a broadband mirror. Web1 de dez. de 2014 · High contrast grating (HCG) is an emerging element in integrated optoelectronics. Compared to the other elements, HCG has very rich properties and …

Web1 de out. de 2024 · In this work, we propose a high-contrast-gratings-like absorber to achieve ultra-high absorption based on a thin Germanium layer. High absorption approximately 95% at wavelength 1310 nm is... Web2 de jun. de 2024 · We present the first experimental demonstration of a planar focusing monolithic subwavelength grating mirror. The grating is formed on the surface of GaAs …

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 …

Web12 de fev. de 2013 · Recent advances in high-contrast grating (HCG) vertical-cavity surface-emitting lasers (VCSEL) emitting at 1550 nm is reported in this paper. The novel near-wavelength HCG has an ultrathin structure and broadband reflectivity. It enables a monolithic, simple fabrication process for realizing InP-based VCSELs emitting at ∼1550 … chisholm free pressWebWikipedia graphite vs ceramicWeb9 de ago. de 2024 · Very recently, high-contrast grating (HCG) based biosensor with extremely simple excitation system, high sensitivity, and rapid response time have been … graphite versus steel shaft irons graphite violin bowWeb15 de mai. de 2016 · While high transmissivity and 2 π phase difference could also be found for thicknesses around 800 nm, gratings of those thicknesses are difficult to fabricate due to the high aspect ratio. Therefore, the grating thickness is chosen to be 410 nm, which provides a broad area with high transmissivity and affords easy fabrication with high … chisholm free tafe coursesWebHá 1 hora · Background The differentiation of minimal-fat—or low-fat—angiomyolipomas from other renal lesions is clinically challenging in conventional computed tomography. In … graphite vs charcoal colorWebcreation 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 ... chisholm free will