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4 March 2019 Enhancement of sensitivity in hexagonal ring resonator using localized surface plasmon resonance for bio-chemical sensors
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Abstract
In this paper, we designed hexagonal ring resonator using localized surface plasmon resonance (LSPR) phenomenon to enhance the sensitivity which is a significant factor in bio-chemical sensors. We used a hexagonal ring resonator structure to eliminate the bending loss which is one of the prime factors affects sensitivity. The sensing area of the hexagonal ring resonator with LSPR is deposited metal nanoparticle on cladding which makes difference with general sensing region of the hexagonal ring resonator. In this sensing region, the wavelength of light should be longer than the size of the nanoparticle because the metal nanoparticle reacts the light in specific condition. The sensitivity of the resonator can be improved with using this phenomenon. We used finite difference time domain (FDTD) methods for theoretical analysis. Also, we optimized the structure to reduce LSPR loss and enhance the sensitivity by adjusting type, size, thickness of the metal nanoparticle. As a simulation result, we verified that sensitivity of hexagonal ring resonator with LSPR can be 2.5 times higher than without LSPR.
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Do-Hyun Kim, Sun-Ho Kim, Su-Jin Jeon, Eudum Kim, Jae-Sang Lee, and Young-Wan Choi "Enhancement of sensitivity in hexagonal ring resonator using localized surface plasmon resonance for bio-chemical sensors", Proc. SPIE 10921, Integrated Optics: Devices, Materials, and Technologies XXIII, 109211M (4 March 2019); https://doi.org/10.1117/12.2506595
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