法布里-珀罗干涉仪
材料科学
拉曼散射
拉曼光谱
光学
光电子学
散射
物理
波长
作者
Taehyun Kim,Jongsu Lee,Eui‐Sang Yu,Seung-Ha Lee,Hyeonbin Woo,Jeonghun Kwak,Seok Chung,Inhee Choi,Yong‐Sang Ryu
出处
期刊:Small
[Wiley]
日期:2023-04-05
卷期号:19 (29)
被引量:3
标识
DOI:10.1002/smll.202207003
摘要
The Fabry-Perot (FP) resonator is an intuitive and versatile optical structure owing to its uniqueness in light-matter interactions, yielding resonance with a wide range of wavelengths as it couples with photonic materials encapsulated in a dielectric cavity. Leveraging the FP resonator for molecular detection, a simple geometry of the metal-dielectric-metal structure is demonstrated to allow tuning of the enhancement factors (EFs) of surface-enhanced Raman scattering (SERS). The optimum near-field EF from randomly dispersed gold nano-gaps and dynamic modulation of the far-field SERS EF by varying the optical resonance of the FP etalon are systematically investigated by performing computational and experimental analyses. The proposed strategy of combining plasmonic nanostructures with FP etalons clearly reveals wavelength matching of FP resonance to excitation and scattering wavelengths plays a key role in determining the magnitude of the SERS EF. Finally, the optimum near-field generating optical structure with controlled dielectric cavity is suggested for a tunable SERS platform, and its dynamic SERS switching performance is confirmed by demonstrating information encryption through liquid immersion.
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