Fresnel equations ≈ Fresnel equations
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Fresnel coefficients of a two-dimensional atomic crystal Open
In general the experiments on the linear optical properties of a single-layer\ntwo-dimensional atomic crystal are interpreted by modeling it as a homogeneous\nslab with an effective thickness. Here I fit the most remarkable experiments in\…
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Sequential Infiltration Synthesis for the Design of Low Refractive Index Surface Coatings with Controllable Thickness Open
Control over refractive index and thickness of surface coatings is central to the design of low refraction films used in applications ranging from optical computing to antireflective coatings. Here, we introduce gas-phase sequential infilt…
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Numerical analysis of an ultra-wideband metamaterial absorber with high absorptivity from visible light to near-infrared Open
In this study, we designed a novel ultra-wideband (UWB) absorber and numerically analyzed it to demonstrate that its light absorptivity was greater than 90% in the wavelength range of visible light and near-infrared (405-1505 nm). The stru…
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Spatial Resolution in GNSS-R Under Coherent Scattering Open
Global Navigation Satellite Systems Reflectometry can be understood as a multistatic radar using satellite navigation signals as signals of opportunity. The scattered signals over sea ice, flooded areas, even under dense vegetation, and in…
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Graphene-Based Ultrathin Flat Lenses Open
Flat lenses when compared to curved surface lenses have the advantages of being aberration free, and they offer a compact design necessary for a myriad of electro-optical applications. In this paper we present flat and ultrathin lenses bas…
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Confinement loss in hollow-core negative curvature fiber: A multi-layered model Open
Simple structures are always a pursuit but sometimes not easily attainable. It took researchers nearly two decades for conceiving the structure of single-ring hollow-core negative curvature fiber (NCF). Recently NCF eventually approaches t…
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Nonlinear Metasurface Fresnel Zone Plates for Terahertz Generation and Manipulation Open
We introduce a nanoengineered nonlinear metasurface based optical element that acts as an emitting Fresnel zone plate of terahertz (THz) waves. We show that the nonlinear zone plate generates broadband THz radiation and focuses each genera…
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Soil Moisture Content from GNSS Reflectometry Using Dielectric Permittivity from Fresnel Reflection Coefficients Open
Global Navigation Satellite Systems-Reflectometry (GNSS-R) has shown unprecedented advantages to sense Soil Moisture Content (SMC) with high spatial and temporal coverage, low cost, and under all-weather conditions. However, implementing a…
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Multimode microfiber interferometer for dual-parameters sensing assisted by Fresnel reflection Open
A compact and low cost fiber sensor based on single multimode microfiber with Fresnel reflection is proposed and demonstrated for simultaneous measurement of refractive index and temperature. The sensor is fabricated with two simple steps …
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Bilayer Metasurfaces for Dual- and Broadband Optical Antireflection Open
Optical antireflection has long been pursued for a wide range of applications, but existing approaches encounter issues in the performance, bandwidth, and structure complexity, particularly in the long-wavelength infrared regime. Here we p…
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Angle-Multiplexed Metasurfaces: Encoding Independent Wavefronts in a Single Metasurface under Different Illumination Angles Open
The angular response of thin diffractive optical elements is highly correlated. For example, the angles of incidence and diffraction of a grating are locked through the grating momentum determined by the grating period. Other diffractive d…
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Design and Fabrication of a Custom-Dielectric Fresnel Multi-Zone Plate Lens Antenna Using Additive Manufacturing Techniques Open
Dielectric flat plate lens antennas fabricated using 3D printing offer several attractive designs features including volumetric efficient geometries, beam-steering capabilities, and relative ease of fabrication. This paper seeks to synthes…
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Circular core single-mode polymer optical waveguide fabricated using the Mosquito method with low loss at 1310/1550 nm Open
We fabricate low-loss single-mode (SM) polymer optical waveguides using a photomask-free simple technique named the Mosquito method. The insertion losses of a 5-cm long SM polymer waveguide fabricated are 2.52 dB and 4.03 dB at 1310- and 1…
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Ultrasensitive refractive index fiber sensor based on high-order harmonic Vernier effect and a cascaded FPI Open
This paper proposes and demonstrates an ultrasensitive refractive index (RI) sensor based on harmonic Vernier effect (HEV) and a cascaded Fabry–Perot interferometer (FPI). The sensor is fabricated by sandwiching a hollow-core fiber (HCF) s…
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Comparison of microfacet BRDF model to modified Beckmann-Kirchhoff BRDF model for rough and smooth surfaces Open
A popular class of BRDF models is the microfacet models, where geometric optics is assumed. In contrast, more complex physical optics models may more accurately predict the BRDF, but the calculation is more resource intensive. These seemin…
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In-Situ Cure Monitoring of Wind Turbine Blades by Using Fiber Bragg Grating Sensors and Fresnel Reflection Measurement Open
A fiber-optic cure monitoring system is proposed to measure curing status of composite structure such as a large scale wind turbine blade. The monitoring is based on the measurement of Fresnel reflectivity at the optical fiber/epoxy resin …
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Design of a 4-level active photonics phase change switch using VO2 and Ge2Sb2Te5 Open
The objective of this work is to design and demonstrate multilevel optical switches by combining different phase change materials. Ge2Sb2Te5 and VO2 nanolayer structures were designed to maximize the optical contrast between four different…
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Reflection of resonant light from a plane surface of an ensemble of motionless point scatters: Quantum microscopic approach Open
On the basis of general theoretical results developed previously in [JETP\n112, 246 (2011)], we analyze the reflection of quasiresonant light from a plane\nsurface of dense and disordered ensemble of motionless point scatters. Angle\ndistr…
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Broadband and wide-angle antireflective subwavelength microstructures on zinc sulfide fabricated by femtosecond laser parallel multi-beam Open
The subwavelength microstructures (SWMS) on the surface of ZnS for antireflection in an infrared band have been theoretically designed and experimentally fabricated. The finite difference time domain (FDTD) simulation has been utilized to …
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Novel localized vibration-assisted magnetic abrasive polishing method using loose abrasives for V-groove and Fresnel optics finishing Open
This paper presents a new localized vibration-assisted magnetic abrasive polishing (VAMAP) method using loose abrasives for V-groove and Fresnel optics finishing. The purpose is to improve the surface quality while maintaining the form of …
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Chirality induced asymmetric spin splitting of light beams reflected from an air-chiral interface Open
The spin Hall effect (SHE) of light beams reflected from an air-chiral interface are investigated systematically. Due to the intrinsic chiral asymmetry of the medium, a horizontally polarized incident Gaussian beam will undergo asymmetric …
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Refractive index of delignified wood for transparent biocomposites Open
Developed light transmission model for determining refractive index of wood, complex porous or layered solid materials and composites.
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Closed-form expression for the Goos-Hänchen lateral displacement Open
The Artmann formula provides an accurate determination of the Goos-Haenchen lateral displacement in terms of the light wavelength, refractive index and incidence angle. In the total reflection region, this formula is widely used in the lit…
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Role of nanoparticles in wavelength selectivity of multilayered structures in the far-field and near-field regimes Open
Microscopic thin films have shown wavelength selectivity in the context of radiative heat transfer. We propose a methodology to shift the wavelength selectivity in the desired location. This work deals with the far-field and near-field rad…
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Theoretical and Experimental Studies on the Signal Propagation in Soil for Wireless Underground Sensor Networks Open
Wireless Underground Sensor Networks (WUSNs), an important part of Internet of things (IoT), have many promising applications in various scenarios. Signal transmission in natural soil undergoes path loss due to absorption, radiation, refle…
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Ultra-sparse dielectric nanowire grids as wideband reflectors and polarizers Open
Engaging both theory and experiment, we investigate resonant photonic lattices in which the duty cycle tends to zero. Corresponding dielectric nanowire grids are mostly empty space if operated as membranes in vacuum or air. These grids are…
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High-power and highly efficient composite laser with an anti-reflection coated layer between a laser crystal and a diamond heat spreader fabricated by room-temperature bonding Open
We have succeeded in bonding a Nd:YAG crystal and an anti-reflection coated diamond crystal to realize a composite laser which minimizes the Fresnel-reflection loss at the bonded interface for the first time. This newly developed composite…
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Effective, angle-independent radiative cooler based on one-dimensional photonic crystal Open
A simple and low-cost radiative cooler based on one-dimensional photonic crystal is proposed in this work, which has an average emissivity of 96% within the atmospheric transparency window (8-13μm). The ultra-broadband emissivity property …
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Reflection beamshifts of visible light due to graphene Open
I present calculations of reflection beamshifts, Goos-H\"anchen and Imbert-Fedorov shifts, due to the presence of a monolayer graphene on a dielectric media when using a beam with wavelength in the visible range. Measuring the Goos-H\"anch…
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Optimized weak measurements of Goos–Hänchen and Imbert–Fedorov shifts in partial reflection Open
The spatial and the angular variants of the Imbert-Federov (IF) beam shifts and the angular Goos-Hänchen (GH) shift contribute in a complex interrelated way to the resultant beam shift in partial reflection at planar dielectric interfaces.…