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자료유형
학술저널
저자정보
저널정보
한국광학회 Current Optics and Photonics Journal of the Optical Society of Korea Vol.19 No.6
발행연도
2015.12
수록면
566 - 574 (9page)

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We report for the first time highly efficient trans-reflective color filters capable of demonstratingcoloration in both transmission and reflection modes by taking advantage of a multilayer stack consistingof MgF<sub>2</sub> and TiO<sub>2</sub> used respectively as the low and high index materials. In order to enable suchtrans-reflective performance, securing an optimal stop band assuming an appropriate bandwidth within thevisible regime is pivotal, which was realized by tailoring the thicknesses and the numbers of TiO<sub>2</sub>-MgF<sub>2</sub>bi-layers. Three devices were designed through rigorous simulations and developed via e-beam evaporationto demonstrate vivid blue, green, and red colors in the reflection mode, and yellow, magenta, and cyancolors in the transmission mode, featuring an enhanced efficiency exceeding 90% under normal incidence. The color performance of the filters was examined by referring to the chromaticity coordinates of thetransmission and reflection spectra, alongside photographed color images. The dependence of theperformance on the angle of incidence was explored with respect to incident polarization, indicating thata transmission surpassing 60% could be stably maintained up to an angle of 75°. Polarization independenttransfer characteristics were especially achieved for the normal incidence. The proposed devices may bereadily extended to other spectral regimes by adjusting the thicknesses of the films

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