A multichannel color filter with the functions of optical sensor and switch

Yuan-Fong Chou Chau; Chung-Ting Chou Chao; Hung Ji Huang; Sy-Hann Chen; Tsung Sheng Kao; Hai-Pang Chiang

doi:10.1038/s41598-021-02453-2

A multichannel color filter with the functions of optical sensor and switch

Sci Rep. 2021 Nov 25;11(1):22910. doi: 10.1038/s41598-021-02453-2.

Authors

Yuan-Fong Chou Chau¹, Chung-Ting Chou Chao², Hung Ji Huang³, Sy-Hann Chen⁴, Tsung Sheng Kao⁵, Hai-Pang Chiang⁶

Affiliations

¹ Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong, BE1410, Brunei Darussalam. chou.fong@ubd.edu.bn.
² Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung, 20224, Taiwan, ROC.
³ Taiwan Instrument Research Institute, National Applied Research Laboratories, Hsinchu, 300, Taiwan, ROC.
⁴ Department of Electrophysics, National Chiayi University, 600, Chiayi, Taiwan, ROC.
⁵ Department of Photonics & Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu, 300, Taiwan, ROC. tskao@nctu.edu.tw.
⁶ Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung, 20224, Taiwan, ROC. hpchiang@mail.ntou.edu.tw.

Abstract

This paper reports a multichannel color filter with the functions of optical sensor and switch. The proposed structure comprises a metal-insulator-metal (MIM) bus waveguide side-couples to six circular cavities with different sizes for filtering ultra-violet and visible lights into individual colors in the wavelength range of 350-700 nm. We used the finite element method to analyze the electromagnetic field distributions and transmittance properties by varying the structural parameters in detail. The designed plasmonic filter takes advantage of filtering out different colors since the light-matter resonance and interference between the surface plasmon polaritons (SPPs) modes within the six cavities. Results show that the designed structure can preferentially select the desired colors and confine the SPPS modes in one of the cavities. This designed structure can filter eleven color channels with a small full width at half maximum (FWHM) ~ 2 nm. Furthermore, the maximum values of sensitivity, figure of merit, quality factor, dipping strength, and extinction ratio can achieve of 700 nm/RIU, 350 1/RIU, 349.0, 65.04%, and 174.50 dB, respectively, revealing the excellent functions of sensor performance and optical switch, and offering a chance for designing a beneficial nanophotonic device.

Abstract

Grants and funding