Numerical Simulation and Experimental Measurement for EM Enhancement of SERS
Muyang Huang
Department of Physics & Astronomy
Faculty Supervisor: Huizhong Xu
SERS is a very important technique for measuring the specific spectrum fingerprint for molecules. Cause when a laser shines on the molecule, the molecule's vibrational modes will change by the incident wave and produce Raman scattering. different from absorption or emission spectrum, The energy level is not directly related to the energy difference between neighboring modes, but the frequency shift. Based on that feature, the Raman peak is very easy to find in a wide frequency spectrum. However, the Raman effect has a very low possibility. The fractured Raman signal is very difficult to find. To solve those difficulties, using small medal particle on the mirror surface to enhance signal which called SERS technique. This project will focus on how the small particle and mirror structure enhanced the output signal, especially based on the enhancement of local field amplitude, which can be derived from the basic Maxwell equation. Also, there will be some lab experiments to actually see whether these nano structure produce the signal we expected to see.