Irradiated vertically aligned supported 2.5 dimensional nanowires (NWs) show strong optical absorption due to the leaky mode resonance (LMR), and optical standing waves (SWs) created by waveguiding effects. Silver nanoparticles (AgNPs) have their plasmonic electric (E) field strengths modulated under the effect of the LMR and SW as a function of the optical indices (n, k) of the NWs. At (n=3.88, k=0), a theoretical maxima of the E-field was obtained, which matches closely with the Si (3.84, 0.02) system. The optimized hybrid system, AgNPs on silicon NW, demonstrates pico-femto molar detection of marine toxins by surface plasmon-aided SERS.
- Yi-Fan Huang
- Chiung-Yi Chen
- Surojit Chattopadhyay
