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Direct method of extracting broadband complex refractive index from spectrophotometric measurements: an application to polydimethylsiloxane for passive radiative cooling

Published

Author(s)

Braden E. Czapla, Leonard Hanssen

Abstract

We describe an algorithm to extract the complex refractive index of a material from broadband reflectance and transmittance measurements taken by spectrophotometers. The algorithm combines Kramers-Kronig analysis with an inversion of Fresnel's equations to provide a direct method of solving for the refractive index which is accurate, even for weakly absorbing materials, and easily applicable to radiative heat transfer calculations. The algorithm is validated by extracting the complex refractive index of polydimethylsiloxane between 0.25 μm and 100 μm and comparing against existing literature. We also discuss the importance of broadband optical properties to passive radiative cooling and details of the uncertainty analysis of the algorithm.
Citation
Journal of Photonics for Energy
Volume
11
Issue
3

Keywords

refractive index, Kramers-Kronig, spectrophotometry, polydimethylsiloxane

Citation

Czapla, B. and Hanssen, L. (2021), Direct method of extracting broadband complex refractive index from spectrophotometric measurements: an application to polydimethylsiloxane for passive radiative cooling, Journal of Photonics for Energy, [online], https://doi.org/10.1117/1.JPE.11.032105, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=931488 (Accessed July 4, 2022)
Created September 23, 2021, Updated October 14, 2021