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   Articles with "graded index" as a keyword



Iontronically Tunable Broadband Graded Index Films

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recommendations! Published in 2024 at "Advanced Optical Materials"

DOI: 10.1002/adom.202402410

Abstract: Tunable optical devices are of paramount importance in modern optical engineering, offering the flexibility to dynamically adjust key optical parameters, thus enhancing functionality and adaptability. In this study, a fresh approach is presented to achieve… read more here.

Keywords: broadband graded; index; graded index; tunable broadband ... See more keywords

Implantable graded‐index fibers for neural‐dynamics‐resolving brain imaging in awake mice on an air‐lifted platform

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recommendations! Published in 2022 at "Journal of Biophotonics"

DOI: 10.1002/jbio.202200025

Abstract: We demonstrate a versatile framework for cellular brain imaging in awake mice based on suitably tailored segments of graded‐index (GRIN) fiber. Closed‐form solutions to ray‐path equations for graded‐index waveguides are shown to offer important insights… read more here.

Keywords: graded index; brain; fiber; brain imaging ... See more keywords

Optimization of anti-reflective coatings using a graded index based on silicon oxynitride

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recommendations! Published in 2019 at "Journal of Computational Electronics"

DOI: 10.1007/s10825-019-01334-2

Abstract: The present work deals with a comparative study of three anti-reflective coatings (ARCs) based on oxynitride using a gradient refractive index (graded index) following three proposed profiles such as the linear, sub-linear and super-linear profiles.… read more here.

Keywords: anti reflective; optimization anti; graded index; reflective coatings ... See more keywords

Thermal emission of a two-dimensional semitransparent medium with discrete distributions of graded index

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recommendations! Published in 2020 at "International Communications in Heat and Mass Transfer"

DOI: 10.1016/j.icheatmasstransfer.2020.104726

Abstract: Abstract The backward Monte Carlo method combined with the discrete Runge-Kutta ray-tracing technique (DRKRT) is developed to simulate the thermal emission of a two-dimensional medium with discrete distributions of graded index. Refractive index and its… read more here.

Keywords: index; thermal emission; graded index; discrete distributions ... See more keywords

Tuning light focusing with liquid crystal infiltrated graded index photonic crystals

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recommendations! Published in 2017 at "Optics Communications"

DOI: 10.1016/j.optcom.2016.07.062

Abstract: Abstract We perform numerical analyses of tunable graded index photonic crystals based on liquid crystals. Light manipulation with such a photonic medium is explored and a new approach for active tuning of the focal distance… read more here.

Keywords: index; index photonic; photonic crystal; photonic crystals ... See more keywords

Modulation transfer function of the imaging probe using an 8.8 mm-long and 125 µm-thick graded- index short multimode fiber

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recommendations! Published in 2017 at "Optics Communications"

DOI: 10.1016/j.optcom.2016.10.007

Abstract: Abstract We measured the modulation transfer function (MTF) of a short multimode fiber (SMMF) probe and proposed the optical model including the thin random phase screen (TRPS) to explain degradations of imaging characteristics. SMMF is… read more here.

Keywords: multimode fiber; modulation transfer; transfer function; short multimode ... See more keywords
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Exact graded-index profile to produce an annular beam

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recommendations! Published in 2020 at "Optics Communications"

DOI: 10.1016/j.optcom.2020.126037

Abstract: Abstract This work presents the exact radial refractive index profile of a graded-index lens required to produce an annular beam. The index profile variation obtained is compatible with MCVD fiber fabrication process. Moreover, we show… read more here.

Keywords: index; produce annular; graded index; annular beam ... See more keywords

New method for calculating the coupling coefficient in graded index optical fibers

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recommendations! Published in 2018 at "Optics and Laser Technology"

DOI: 10.1016/j.optlastec.2017.11.026

Abstract: Abstract A simple method is proposed for determining the mode coupling coefficient D in graded index multimode optical fibers. It only requires observation of the output modal power distribution P(m, z) for one fiber length… read more here.

Keywords: coupling coefficient; index; method; graded index ... See more keywords
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Spectroscopic and morphological studies of SiO2 graded index thin films fabricated at oblique incidence angles

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recommendations! Published in 2020 at "Optical Materials"

DOI: 10.1016/j.optmat.2019.109560

Abstract: Abstract The present paper reports the fabrication of single layer graded index SiO2 thin films at various oblique incidence angles by using Static glancing angle deposition (GLAD) setup. These SiO2 films have been fabricated by… read more here.

Keywords: incidence; thin films; incidence angles; deposition ... See more keywords

Role of the electron blocking layer in the graded-index separate confinement heterostructure nitride laser diodes

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recommendations! Published in 2018 at "Superlattices and Microstructures"

DOI: 10.1016/j.spmi.2018.02.016

Abstract: Abstract In this work, we investigate the role of the electron blocking layer (EBL) in laser diodes based on a graded index separate confinement heterostructure. We compare two sets of devices with very different EBL… read more here.

Keywords: electron blocking; role electron; blocking layer; laser diodes ... See more keywords

Solution processes for ultrabroadband and omnidirectional graded-index glass lenses with near-zero reflectivity in high concentration photovoltaics

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recommendations! Published in 2018 at "Scientific Reports"

DOI: 10.1038/s41598-018-33200-9

Abstract: Concentrator photovoltaic (CPV) systems, where incident direct solar radiation is tightly concentrated onto high-efficiency multi-junction solar cells by geometric optical elements, exhibit the highest efficiencies in converting the sun’s energy into electric power. Their energy… read more here.

Keywords: index; processes ultrabroadband; glass; solution processes ... See more keywords