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Surface enhanced Raman spectroscopy (SERS) at the single molecule level provides an ultrasensitive and selective method to chemically detect the traces of virtually any materials, and allows the exploration of more detailed information than is available in the spectra taken from a collection of molecules such as molecular dynamics and in situ molecular structural probing. We are developing top-down fabricated nanophotonic devices for well controlled single molecule (non-resonant) Raman spectroscopy.
Theoretical modeling indicates strong nanofocusing in a vertical optical antenna integrated with a spiral ring grating, and over 1011 electromagnetic SERS enhancement factors within a 2000cm-1 Stokes shift.
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