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

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