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Título
Omnidirectional high-reflectivity mirror in the 4–20μm spectral range
Autor(es)
Materia
high-reflectivity mirrors
omnidirectional reflectors
aperiodic multilayers
Fecha de publicación
2017-05
Citación
del Barco, O., Jarque, E. C., Gasparian, V., & Bueno, J. M. (2017). Omnidirectional high-reflectivity mirror in the 4–20μm spectral range. Journal of Optics, 19(6), 065102. https://doi.org/10.1088/2040-8986/aa6c76
Resumen
Decreasing-width multilayers (DWMs) can behave as highly-efficient broadband reflectors with wider reflection spectrum than periodic, disordered or other aperiodic structures made of the same materials. In this article, we numerically analyze and optimize the reflectance R of a linear DWM formed by the bilayer $\mathrm{CsBr}\mbox{--}\mathrm{Te}$ from normal to grazing incidence and for a large wavelength spectrum (from mid to far infrared). As a result, when the rate of the thickness decrease of $\mathrm{CsBr}$ layers equals −59.5 nm/layer, an optimized average reflectance for ${\text{}}p$ polarization $\langle {R}_{p}\rangle =1\,-\,6\times {10}^{-6}$ can be obtained in the 4–20 μm spectral range for all angles of incidence. For ${\text{}}s$ incident states, the average reflectance is even greater $\langle {R}_{s}\rangle =1\,-\,3\times {10}^{-7}$. Moreover, a near-zero transmittance region $T\leqslant {10}^{-12}$ occurs in the 12–20 μm wavelength interval constituting (to our knowledge) the widest spectrum for a single omnidirectional mirror where such remarkable reflectance values can be achieved.
URI
ISSN
2040-8978
DOI
10.1088/2040-8986/aa6c76
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- ALF. Artículos [297]
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