Fabry–Perot Cavity Control for Tunable Raman Scattering

Taehyun Kim, Jongsu Lee, Eui Sang Yu, Seungha Lee, Hyeonbin Woo, Jeonghun Kwak, Seok Chung, Inhee Choi, Yong Sang Ryu

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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.

Original languageEnglish
Article number2207003
JournalSmall
Volume19
Issue number29
DOIs
StatePublished - 19 Jul 2023

Keywords

  • Fabry–Perot resonators
  • encryption
  • nanocavity
  • plasmonic nanoparticles
  • surface-enhanced Raman scattering

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