期刊
OPTICS EXPRESS
卷 23, 期 7, 页码 8995-9003出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.23.008995
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资金
- National NaturalScience foundation of China [11374376, 11174374]
- Key project of DEGP [2012CXZD0001]
- Innovative Talents Training Program for Doctoral Students of Sun Yat-sen University
The detection of minuscule changes in the local refractive index by localized surface plasmon resonances (LSPRs), carried by metal nanostructures, has been used successfully in applications such as real-time and label-free detection of molecular binding events. However, localized plasmons demonstrate 1-2 orders of magnitude lower figure of merit (FOM) compared with their propagating counterparts. Here, we propose and experimentally demonstrate a high-performance refractive index sensor based on a structure of double-layered metal grating (DMG) with an FOM and FOM* reaching 38 and 40 respectively under normal incidence. Such a high FOM and FOM* arise from a result of a sharp fano resonance, which is caused by the coherent interference between the LSPR from the individual top gold stripes and Wood's anomaly (WA). Moreover, a small conformal decay length of similar to 68 nm is determined in DMG, indicating that the DMG is a promising candidate for label-free biomedical sensing. (C) 2015 Optical Society of America
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