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论文类型： 会议论文

发表时间： 2019-01-01

收录刊物： CPCI-S

卷号： 11209

关键字： Nanostructures; narrowband; perfect absorption; biosensing

摘要： In this paper, we theoretically investigate a tunable ultra-narrow band absorber consisting of lamellar structure in the near-infrared wavelength range. The absorption efficiency is 99.9% under normal incidence and the full width at half maximum (FWHM) is only 4nm. The high absorption is attributed to the surface plasmon resonance (SPR), which increases the interaction volume of the optical field. The ultra-narrow band absorber has a high refractive index sensitivity of 1208nm/RIU in a wide refractive index range of 1.33 to 1.40 and a high figure of merit of 302. Besides, the influence of structure parameters on the sensing performance are also investigated. Due to its easiness to be fabricated, the proposed structure has potential in sensing application.