21st Annual Student Research Conference
Optical Enhancement of Raman Spectrum
Nirab K. Manandhar
Dr. Mohammad Samiullah, Faculty Mentor
Raman scattering is very weak because only about ten out of a billion incident photons are inelastically scattered. In the present setup, the laser light is focused on the sample only once and the scattered light is collected in the spectrometer, but more than 99.9% of the original photons are transmitted through the sample solution unused. So, a collection and reuse of transmitted light presents an opportunity for further improvement in the design of the spectrometer. To take advantage of this situation, we have modified the external optics by placing two mirrors and an additional lens, so that the transmitted beam is redirected to the sample several times. This reflection process is repeated several times enhancing the intensity of the Raman scattered light. Preliminary results show that the use of modified external optics of the spectrometer increases the intensity of scattered light by at least two fold.
Keywords: Raman, Enhancement, Optical, spectrometer
Topic(s):Physics
Presentation Type: Oral Paper
Session: 42-3
Location: VH 1416
Time: 1:45