Surface-Enhanced Raman
Scattering with Ag Nanoparticles Optically Trapped by a Photonic Crystal
Cavity
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Abstract
We demonstrate a reusable and reconfigurable surface
enhanced Raman scattering (SERS) platform by optically trapping Ag
nanoparticles with a photonic crystal cavity integrated with a microfluidic
chip. High-performance SERS is performed in a very reproducible manner,
owing to the fact that Ag aggregates are produced by optical trapping
in a controllable process that is monitored in real-time by the cavity
resonance shift that occurs with the trapping of each additional nanoparticle