| Summary: | 碩士 === 國立清華大學 === 光電工程研究所 === 105 === In this work, a resonance-based sensing device for biomedical applications, is studied. The device is designed for operation at 10 um (~30 THz) is sensitive and with high Q. When the biological cells are attached to the surface of the resonator-based device, its resonance frequency will shift, making possible and calibration-free, speedy biological cell detection.
We focus on the design of devices with high-quality factor as a refractive index detector in order to improve the resolution of such biological sensing devices. In order to achieve this result, we propose an asymmetric optical resonance structure based on the Fano resonance. The principle of pattern on the device is composed of two groups of bars. Each group have two set of asymmetry bars. The gaps between bars are enhancing element to boost the sensitivities of the device. According to the simulation, our design can reach a quality factor as high as 1546, while previous designs only exhibited Q-factor of 80. The sensitivity is about 2500nm/RIU it is twice times bigger than that of Lahiri and Basudev. The figure of merit estimated to be as 383.
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