科研之友
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摘要
We present a method to theoretically achieve multispectral ultra-narrowband near-unity absorption in metal structure with deep-subwavelength plasmonic nanocavities (i.e., volumes < lambda(3)/20 000) for high-quality sensing. The concept is based on the combined excitation of multiple plasmon resonances and high optical field confinement by an array of hexagonal non-close-packed cross-shape nanocavities on an opaque metal film. A multispectral plasmonic nano-sensor with high refractive index sensitivity (538 nm/RIU) and figure of merit (58) in the optical region is obtained with the minimum bandwidth of 8 nm, which offers new perspectives for achieving ultra-compact efficient biosensors.
- 出版日期2014-2-24
- 单位江西师范大学
