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Proceedings Paper

Single-particle optical scattering spectroscopy in white light supercontinuum optical tweezers
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Paper Abstract

White light supercontinuum, which is generated by coupling short laser pulses into a nonlinear photonic crystal fiber, not only covers an extremely broad wavelength range (e.g., from visible to near infrared) but also has high spatial coherence. As a result, tightly focused supercontinuum can be used to trap a single particle and simultaneously to perform broad-band ultra-sensitive optical spectroscopy at a single particle level. In this paper we investigate the optical scattering spectroscopy of a single particle in white light supercontinuum optical tweezers. Lorenz-Mie theory and Fourier angular spectrum analysis are used to model the scattering of tightly focused supercontinuum by a uniform spherical scatterer. In addition, Born approximation method is applied to analyze scattering by non-spherical weak scatterers. Unlike conventional ensemble averaged spectroscopy, single particle spectroscopy has the unique capability to probe the properties of individual particles, which can lead to many important applications such as ultrasensitive sensing and nanoparticle characterization.

Paper Details

Date Published: 11 September 2006
PDF: 9 pages
Proc. SPIE 6326, Optical Trapping and Optical Micromanipulation III, 63261H (11 September 2006); doi: 10.1117/12.681437
Show Author Affiliations
Peng Li, The Pennsylvania State Univ. (United States)
Kebin Shi, The Pennsylvania State Univ. (United States)
Zhiwen Liu, The Pennsylvania State Univ. (United States)

Published in SPIE Proceedings Vol. 6326:
Optical Trapping and Optical Micromanipulation III
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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