期刊
APPLIED OPTICS
卷 58, 期 18, 页码 4878-4883出版社
OPTICAL SOC AMER
DOI: 10.1364/AO.58.004878
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资金
- Guangzhou Municipal Science and Technology Project [201904010243]
- National Natural Science Foundation of China (NSFC) [61405039, 61475037]
- Science and Technology Planning Projects of Guangdong Province, China [2016A020223013]
- Foundation for Distinguished Young Talents in Higher Education of Guangdong, China [2014KQNCX066]
- Research Fund of Guangdong University of Technology [13ZK0387, 16ZK0041]
A chip-scale refractive index sensor based on multiple Fano resonances is proposed by using a metal-insulator-metal (MIM) structure, which is constructed by two side-coupled semi-ring cavities and a vertical cavity. The finite-difference time-domain method and multimode interference coupled-mode theory are employed to simulate and analyze the transmission spectra of this structure, respectively. First, dual Fano resonances are generated in the MIM structure with a baffle and a semi-ring cavity. By arranging two additional cavities, the mode interferences successfully induce up to six ultra-sharp and asymmetrical Fano peaks. The calculated sensing performances are available with ultra-high sensitivity of 1405 nm/RIU and figure of merit of 3.62 x 10(5). This chip-scale refractive index sensor may have great applications in highly integrated photonic circuits. (C) 2019 Optical Society of America
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