Using a Fabry–Perot Cavity to Augment the Enhancement Factor for Surface-Enhanced Raman Spectroscopy and Tip-Enhanced Raman Spectroscopy

• DOI: 10.1021/acs.jpcc.8b05253
• Publication Date: 2018-06-12T20:23:51Z
• Authors: Yinsheng Guo; Song Jiang; Xu Chen; Michael Mattei; Jon. A. Dieringer; John P. Ciraldo; Richard P. Van Duyne
• Keywords: Surface-Enhanced Raman Spectroscopy

We propose the use of Fabry–Perot cavities as a means to augment enhancement factor in surface-enhanced Raman spectroscopy (SERS) and tip-enhanced (TERS) experiments by optical interference. Using both clean-room bench-top fabrication approaches, we demonstrate that such design can be readily realized provides an additional 12× SERS 5× TERS enhancement, good agreement with expectations from electromagnetic modeling. The mechanism interference is far-field nature independent mechanisms relying on plasmonic molecular resonances. Therefore, cavity substrate applied generally without material limitations. structure at large incidence angles away surface normal, particularly suitable for low-light measurements side illumination.