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Raman-Microsampling Technique Applying Optical Levitation by Radiation Pressure

Volume 38, Number 1 (Feb. 1984) Page 78-83

Thurn, R.; Kiefer, W.


We report on a new Raman microprobe technique where micron-sized solid particles are trapped in stable optical potential wells using only the force of radiation pressure from a continuous gas laser. We demonstrate this technique with Raman spectra from spherical and non-spherical particles of sizes ranging between 10-30 μm. The particles are stably supported by a vertical directed focused TEM00-mode cw argon ion laser of ~500 mW. The latter simultaneously serves as the exciting light source. Several suggestions for improvements of this technique are made.