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Optical coating

About: Optical coating is a research topic. Over the lifetime, 4831 publications have been published within this topic receiving 64824 citations.


Papers
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Journal ArticleDOI
TL;DR: It is shown that under appropriate conditions interference can instead persist in ultrathin, highly absorbing films of a few to tens of nanometres in thickness, and a new type of optical coating comprising such a film on a metallic substrate, which selectively absorbs various frequency ranges of the incident light is demonstrated.
Abstract: Optical coatings usually consist of many multilayers of thin films to achieve the desired properties A new approach using interference effects between an absorbing dielectric film and a metallic substrate now enables ultrathin optical coatings that could also find applications as thin solar cells or photodetectors

861 citations

Journal ArticleDOI
TL;DR: The investigation shows how sensitive the refractive index functions are to the O2 and N2 flow rates, and for which growth conditions the materials deposit homogeneously, and allows conclusions to be drawn on the degree of amorphousness and roughness.
Abstract: The complex refractive index components, n and k, have been studied for thin films of several common dielectric materials with a low to medium refractive index as functions of wavelength and stoichiometry for mid-infrared (MIR) wavelengths within the range 1.54–14.29 μm (700–6500 cm−1). The materials silicon oxide, silicon nitride, aluminum oxide, aluminum nitride, and titanium oxide are prepared using room temperature reactive sputter deposition and are characterized using MIR variable angle spectroscopic ellipsometry. The investigation shows how sensitive the refractive index functions are to the O2 and N2 flow rates, and for which growth conditions the materials deposit homogeneously. It also allows conclusions to be drawn on the degree of amorphousness and roughness. To facilitate comparison of the materials deposited in this work with others, the index of refraction was also determined and provided for the near-IR and visible ranges of the spectrum. The results presented here should serve as a useful information base for designing optical coatings for the MIR part of the electromagnetic spectrum. The results are parameterized to allow them to be easily used for coating design.

724 citations

Journal ArticleDOI
TL;DR: In this paper, a bio-inspired templating technique for fabricating broadband antireflection coatings that mimic antirelective moth eyes was reported, and two common simulation methods, coupled-wave analysis and thin-film multilayer models, were used to generate almost identical prediction for the templated nipple arrays.
Abstract: We report a bioinspired templating technique for fabricating broadband antireflection coatings that mimic antireflective moth eyes. Wafer-scale, subwavelength-structured nipple arrays are directly patterned on silicon using spin-coated silica colloidal monolayers as etching masks. The templated gratings exhibit excellent broadband antireflection properties and the normal-incidence specular reflection matches with the theoretical prediction using a rigorous coupled-wave analysis (RCWA) model. We further demonstrate that two common simulation methods, RCWA and thin-film multilayer models, generate almost identical prediction for the templated nipple arrays. This simple bottom-up technique is compatible with standard microfabrication, promising for reducing the manufacturing cost of crystalline silicon solar cells.

462 citations

Journal ArticleDOI
TL;DR: It is shown that the control of the index gradient as a design parameter can significantly enhance the performance of interference coatings.
Abstract: Thin-film gradient-index profiles have been analyzed and new profiles have been synthesized for broadband antireflection coatings on dielectric surfaces. It is shown that the control of the index gradient as a design parameter can significantly enhance the performance of interference coatings.

403 citations

Patent
James M. Lepper1, Mohamed K. Diab1
04 Jun 1996
TL;DR: An optical filter used in applications involving spectroscopic measurements is fabricated by depositing layers of optical coatings onto a substrate as discussed by the authors, and the layers are deposited so as to have a substantially constant thickness in a first direction along the surface of the substrate, and a gradually increasing thickness along a direction perpendicular to the first direction.
Abstract: An optical filter used in applications involving spectroscopic measurements is fabricated by depositing layers of optical coatings onto a substrate. The layers are deposited so as to have a substantially constant thickness in a first direction along the surface of the substrate, and a gradually increasing thickness along a direction perpendicular to the first direction. The structure of the optical filter allows for large scale production of the filter so that costs in producing the filter are greatly reduced. The filter may be used in a variety of applications including, but not limited to chemical analysis, blood glucose monitoring, and the like.

368 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202329
202253
202156
202087
2019129
2018110