Mr. Jiayuan Zhang Profile

Jiayuan Zhang

at Soochow Univ

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Proceedings Article | 21 December 2013 Paper

Fabry-Perot color filter with antireflective nano-grating surface

Jiayuan Zhang, Jie Zhang, Xiaoxuan Dong

Proceedings Volume 9047, 90470G (2013) https://doi.org/10.1117/12.2037485

KEYWORDS: Optical filters, Dielectrics, Reflection, Resonators, Antireflective coatings, Metals, Refractive index, Fabry–Perot interferometers, Reflectivity, Silver

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In order to improve the color saturation of reflective Fabry-Perot(FP) color filter, we proposed a reflective color filter incorporating FP resonator with a dielectric grating. The FP resonator consists of high reflection metal film, dielectric film and semi-transparent metal film. The dielectric grating, above the semi-transparent metal film, can reduce the reflection from the semi-transparent film in which case high saturation will be achieved. By using Finite Difference Time Domain(FDTD) method, the reflection spectra characteristic is analyzed as a function of duty cycle, period, refractive index and thickness of the dielectric grating. Based on the simulation results, a high performance color filter is proposed by optimizing the structural parameters. The full width at half-maximum (FWHM) reflection spectrum of the filters are reduced from 100 nm to 70 nm and the peak reflection efficiency of the filters are about 90%. The overlap of the tricolor output spectra decreases effectively, which will increase the color saturation of the color filter.

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