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.
Highlights
Several research groups exploited the plasmonic color filters based on SPPs through different MIMcavity-based configurations
We found that cavity plasmon resonance (CPR) plays a pivotal role in offering more plasmon resonance in the proposed color filter system
It is important to note that most of the power flows in each case formed a ring-like spot on the cavity’s periphery surface and propagated in a clockwise direction. These results show that the measurement of hemoglobin concentration (HC) with the proposed color filter can be conducted conveniently with high accuracy at the desired wavelength, and the proposed design can apply in diverse biomedical and refractive index (RI) sensing applications
Summary
Several research groups exploited the plasmonic color filters based on SPPs through different MIMcavity-based configurations. The designed plasmonic filter can separate eleven color channels with a small full width at half maximum (FWHM) ~ 2 nm in the ultraviolet and visible ranges, which cannot attain in other reported articles.
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