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4 September 2018 Spectral signatures of solids and liquids on different substrates: the need for accurate optical constants
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Abstract
Other than water, pure bulk liquids and solids are rarely encountered in the environment, but more commonly exist as layers on various substrates, e.g. concrete, metals, glass, etc. Unlike gas-phase transmission spectra, condensed-phase reflectance spectra depend not only on absorption, but also on the material’s refraction and reflection at interfaces. Providing reference spectra to account for the plethora of morphological conditions (e.g. substrate, layer thickness, particle or droplet size) that may be encountered under different scenarios is a daunting challenge. An alternative approach is to derive the complex optical constants, n and k, which can be used to model the optical phenomena in media and at interfaces, minimizing the need for a vast number of laboratory measurements. The current status of obtaining such optical constants for both solids and liquids is briefly summarized.
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Tanya L. Myers, Russell G. Tonkyn, Brent DeVetter, Tyler O. Danby, Nicole K. Scharko, Ashley M. Oeck, John S. Loring, Yin-Fong Su, and Timothy J. Johnson "Spectral signatures of solids and liquids on different substrates: the need for accurate optical constants", Proc. SPIE 10750, Reflection, Scattering, and Diffraction from Surfaces VI, 1075005 (4 September 2018); https://doi.org/10.1117/12.2321318
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