Kim, Taehyun Lee, Jongsu Yu, Eui-Sang Lee, Seungha Woo, Hyeonbin Kwak, Jeonghun Chung, Seok Choi, Inhee Ryu, Yong-Sang 2024-01-19T09:05:22Z 2024-01-19T09:05:22Z 2023-04-20 2023-07 1613-6810 https://pubs.kist.re.kr/handle/201004/113567 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. English Wiley - V C H Verlag GmbbH & Co. Fabry-Perot Cavity Control for Tunable Raman Scattering Article 10.1002/smll.202207003 1 Small, v.19, no.29 Small 19 29 N scie scopus 000963276900001 2-s2.0-85152019848 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article SINGLE-MOLECULE SENSITIVE DETECTION SPECTROSCOPY PYRIDINE SPECTRA MODES encryption Fabry-Perot resonators nanocavity plasmonic nanoparticles surface-enhanced Raman scattering