Journal
APPLIED PHYSICS LETTERS
Volume 89, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2424674
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The authors discuss on a method to acquire the Raman spectrum of a single optically trapped particle. The method makes use of two laser beams: the first laser traps the particle and moves it back and forth in a plane perpendicular to the laser beam propagation; a second laser acts as Raman probe and it is fixed in space. The Raman spectrum is obtained by phase detecting the backscattered Raman photons using a lock-in amplifier. Within this approach, the background due to the scattering of the environment is completely removed. The authors apply this method to 4.25 mu m diameter polystyrene beads in aqueous solution. (c) 2006 American Institute of Physics. (c) 2006 American Institute of Physics.
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