Nonplasmonic surface enhanced Raman spectroscopy using silica microspheres

摘要

Surface enhanced Raman spectroscopy is presented using a nonplasmonic mechanism based onnwhispering gallery modes in silica microspheres. Sensitive Raman analysis of molecular films isndemonstrated by using 5–10 u0002m sized silica spheres. The advantages of this nonplasmonicnapproach are the active substrate is chemically inert, thermally stable, and relatively simple tonfabricate. Applications include trace organic analysis particularly for in situ planetary instrumentsnthat require robust sensors with consistent response.