Abstract

Thermal emissivity ∊ of cholesteric liquid crystal films is measured as a function of the film thickness d. ∊ increases from 0.2 to 0.4 in parallel with the increase of d from 13 μm to 33 μm and arrives at a constant value as high as 0.87 in the case of d ~ 1 mm. Reflectance at the air-to-liquid crystal interface and the absorption coefficient of the liquid crystal layer are found to be 0.130 and 7.24 × 10⁻³μm⁻¹, respectively. The dependency of ∊ on d is interpretable on the basis of McMahon’s theory of radiant characteristics of semitransparent radiators.

© 1978 Optical Society of America

Optical Reflection from Cholesteric Liquid Crystal Films

S. V. Subramanyam
Appl. Opt. 10(2) 317-320 (1971)

Amorphous silicon as a selective absorber of solar energy: a spectral emissivity study

J. O. White, T. R. Kirst, and J. Tauc
Appl. Opt. 17(15) 2427-2430 (1978)

Patterned cholesteric liquid crystal polymer film

Wei-Liang Hsu, Ji Ma, Graham Myhre, Kaushik Balakrishnan, and Stanley Pau
J. Opt. Soc. Am. A 30(2) 252-258 (2013)

Index determination of opaque and semitransparent metallic films: application to light absorbers

Michel Cathelinaud, Frédéric Lemarquis, and Claude Amra
Appl. Opt. 41(13) 2546-2554 (2002)

Tuning the emission color of organic semiconductor films with cholesteric liquid crystals

Hui-Chen Yeh and Meng-Che Hsieh
Opt. Express 25(10) 11211-11216 (2017)