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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 5 — Feb. 27, 2012
  • pp: 5325–5334

Photophoretic trapping of absorbing particles in air and measurement of their single-particle Raman spectra

Yong-Le Pan, Steven C. Hill, and Mark Coleman  »View Author Affiliations

Optics Express, Vol. 20, Issue 5, pp. 5325-5334 (2012)

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A new method is demonstrated for optically trapping micron-sized absorbing particles in air and obtaining their single-particle Raman spectra. A 488-nm Gaussian beam from an Argon ion laser is transformed by conical lenses (axicons) and other optics into two counter-propagating hollow beams, which are then focused tightly to form hollow conical beams near the trapping region. The combination of the two coaxial conical beams, with focal points shifted relative to each other along the axis of the beams, generates a low-light-intensity biconical region totally enclosed by the high-intensity light at the surface of the bicone, which is a type of bottle beam. Particles within this region are trapped by the photophoretic forces that push particles toward the low-intensity center of this region. Raman spectra from individual trapped particles made from carbon nanotubes are measured. This trapping technique could lead to the development of an on-line real-time single-particle Raman spectrometer for characterization of absorbing aerosol particles.

© 2012 OSA

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(300.6450) Spectroscopy : Spectroscopy, Raman
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Optical Trapping and Manipulation

Original Manuscript: January 5, 2012
Revised Manuscript: February 7, 2012
Manuscript Accepted: February 8, 2012
Published: February 17, 2012

Virtual Issues
Vol. 7, Iss. 4 Virtual Journal for Biomedical Optics

Yong-Le Pan, Steven C. Hill, and Mark Coleman, "Photophoretic trapping of absorbing particles in air and measurement of their single-particle Raman spectra," Opt. Express 20, 5325-5334 (2012)

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