Characterization of light scattering in nematic droplet-polymer films

Naoki Kinugasa; Yuichi Yano; Akio Takigawa; Hideo Kawahara

doi:10.1117/12.60377

15 June 1992 Characterization of light scattering in nematic droplet-polymer films

Naoki Kinugasa, Yuichi Yano, Akio Takigawa, Hideo Kawahara

Proceedings Volume 1665, Liquid Crystal Materials, Devices, and Applications; (1992) https://doi.org/10.1117/12.60377
Event: SPIE/IS&T 1992 Symposium on Electronic Imaging: Science and Technology, 1992, San Jose, CA, United States

Abstract

The optical properties of nematic droplet-polymer films were studied both in the on and off state using Lambert-Beer''s law to characterize their scattering phenomena. For the preparation of the devices, NCAP process was employed with the different diameter, distribution, shape, and density of nematic droplets. Their cell thickness and refractive indices concerning the birefringence of liquid crystals were also controlled. The results showed that the scattering phenomena of nematic droplet-polymer films were likely caused by two types of features. One, related to the surface area of nematic droplets, was the difference of the refractive indices in the interface between liquid crystals and polymer matrix. The other, related to the liquid crystal volume inside the nematic droplets, was the birefringence of liquid crystals. Considering such relations, the extinction coefficient of Lambert-Beer''s law could be described by the sum of the area in the interface multiplied by the difference of the refractive indices between two materials and the liquid crystal volume multiplied by their birefringence. Furthermore, it was found their parallel transmittance in the off state and haze ratio in the on state were well characterized by such extinction coefficient of Lambert-Beer''s law.

Citation Download Citation

Naoki Kinugasa, Yuichi Yano, Akio Takigawa, and Hideo Kawahara "Characterization of light scattering in nematic droplet-polymer films", Proc. SPIE 1665, Liquid Crystal Materials, Devices, and Applications, (15 June 1992); https://doi.org/10.1117/12.60377

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