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Abstract
Surface-enhanced coherent anti-Stokes Raman scattering (SECARS) technique has triggered huge interests due to the significant signal enhancement for high-sensitivity detection. Previous SECARS work has tended to focus only on the enhancement effect at a certain combination of frequencies, more suitable for single-frequency CARS. In this work, based on the enhancement factor for broadband SECARS excitation process, a novel Fano resonance plasmonic nanostructure for SECARS is studied. In addition to the 12 orders of magnitude enhancement effect that can be realized under single-frequency CARS, this structure also shows huge enhancement under broadband CARS in a wide wavenumber region, covering most of the fingerprint region. This geometrically-tunable Fano plasmonic nanostructure provides a way to realize broadband-enhanced CARS, with potentials in single-molecular monitoring and high-selectivity biochemical detection.
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Details
1 Tsinghua University, State Key Laboratory of Precision Measurement Technology & Instruments, Department of Precision Instrument, Beijing, China (GRID:grid.12527.33) (ISNI:0000 0001 0662 3178)
2 National Institute of Metrology, Beijing, China (GRID:grid.419601.b) (ISNI:0000 0004 1764 3184)