Enhanced particle guiding using supercontinuum radiation

Pascal Fischer; Antonia E. Carruthers; Karen P. Volke-Sepulveda; Ewan M. Wright; Helen Little; Christian T. A. Brown; Wilson Sibbett; Kishan Dholakia

doi:10.1117/12.678080

11 September 2006 Enhanced particle guiding using supercontinuum radiation

Pascal Fischer, Antonia E. Carruthers, Karen P. Volke-Sepulveda, Ewan M. Wright, Helen Little, Christian T. A. Brown, Wilson Sibbett, Kishan Dholakia

Author Affiliations +

Proceedings Volume 6326, Optical Trapping and Optical Micromanipulation III; 63261G (2006) https://doi.org/10.1117/12.678080
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

We demonstrate the use of supercontinuum radiation to provide enhanced guiding distances of microscopic particles compared to the standard continuous wave or femtosecond lasers. Our technique relies on the chromatic aberration of the lens used to form an elongated focal region within which guiding takes place. The resulting beam profile has been modelled and shows that for a Gaussian input beam, the intensity profile after the lens can be considered as a sum of Gaussians, one for each wavelength but with varying focal position due to dispersion. Our experimental investigations compare radiation from continuous wave (bandwidth <1nm) and femtosecond pulsed (bandwidth > 100nm) lasers as well as supercontinuum radiation (bandwidth > 450nm) and show good agreement with theory.

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Pascal Fischer, Antonia E. Carruthers, Karen P. Volke-Sepulveda, Ewan M. Wright, Helen Little, Christian T. A. Brown, Wilson Sibbett, and Kishan Dholakia "Enhanced particle guiding using supercontinuum radiation", Proc. SPIE 6326, Optical Trapping and Optical Micromanipulation III, 63261G (11 September 2006); https://doi.org/10.1117/12.678080

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