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24 February 2016 Design of a double grating-coupled surface plasmon color filter
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Proceedings Volume 9744, Optical Components and Materials XIII; 97440C (2016)
Event: SPIE OPTO, 2016, San Francisco, California, United States
Surface plasmon-based nanophotonic devices are advanced in high-sensitivity of wavelength, which can be used to fabricate narrow band color filters. But when SP is excited by grating-coupled structure, the evanescent wave is limited on the interface of metal and dielectric. We design a tunable transmissive filter, consisting of two same sinusoids metal gratings with corresponding substrates and a modulation layer. Herein the dielectric medium is used as the modulation layer and is sandwiched between two metallic gratings. The two metallic gratings are symmetric. If the incident TM wave satisfies the momentum matching condition, the SP excitation at the first metal-dielectric interface will arouse the SP excitation with the same frequency on the second metal-dielectric interface. Then waves with a certain spectrum bandwidth transmit to the far field. The way to tune the selected wavelength is changing the grating period and the distance between two metal gratings in the range of SP penetrating depth. We analyze the influence of the structure profile on the wavelength selectivity. Results show that this novel color filter can realize a continuous shift of transmission peak in the visible range. The transmissivity is higher than 60%. It can be applied to the high resolution display devices to improve the quality of color images.
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Jingjing Guo, Yan Tu, Lanlan Yang, Lili Wang, and Baoping Wang "Design of a double grating-coupled surface plasmon color filter", Proc. SPIE 9744, Optical Components and Materials XIII, 97440C (24 February 2016);

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