Reduced-Threshold Emission of Capillary Filled by Doped-Dye Cholesteric Liquid Crystals With Photo-Alignment Polyimide Films

Lu, Yijun; Yin, Xin; Xiong, Zuoren; Yang, Yue; Sun, Weimin; Liu, Yongjun

doi:10.1109/jphot.2018.2795106

Cited by 5 publications

(1 citation statement)

References 24 publications

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“…Traditional diffractive lenses usually adopt glass substrates with the high surface density (300 kg/m 2 ). Due to the light surface density (1 kg/m 2 ) and low thermal expansion coefficient, the ultrathin membrane material can effectively reduce the weight of optical systems [9].…”

Section: Theories and Methodsmentioning

confidence: 99%

High Precision Fabrication Method of Fresnel Diffractive Lenses on Ultrathin Membrane for Imaging Application

et al. 2020

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The microstructures on flexible membrane substrate prepared by the traditional methods may introduce large morphology and position errors, making it hard to achieve clear imaging. In this paper, we present a high precision fabrication method composed of two steps: unstressed fixation of the polyimide membrane and high precision fabrication of diffractive microstructures on the flexible membrane substrate. By using precise spincoating technology, we get 25 μm thick polyimide membranes, whose coefficient of thermal expansion is almost zero. To prepare high precision microstructures, we propose an aerated membrane method, by which the flexible membrane substrate and the photoresist on it can attach tightly to the mask under the air pressure difference between the upper and lower surfaces of the membrane substrate during the contact lithography. The results show that the wave-front error obtained by this method is less than 1/30λ RMS (F# = 25@632.8 nm) at 400 mm aperture, indicating the microstructures have excellent morphologies and high position accuracy.

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Section: Theories and Methodsmentioning

confidence: 99%