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Scanning particle trapped optical microscopy based on two-photon-induced morphology-dependent resonance in a trapped microsphere

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3 Author(s)
Morrish, Dru ; Centre of Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, P. O. Box 218, Hawthorn, Victoria 3122, Australia ; Xiaosong Gan ; Gu, Min

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We report on scanning particle trapped optical microscopy based on two-photon-induced morphology-dependent resonance (MDR) in a trapped microsphere. In this imaging mode, a femtosecond pulsed laser is adopted for simultaneous laser trapping and two-photon excitation. Due to the localized excitation, MDR is significantly enhanced. As a result, an image contrast enhancement of 9.3% is achieved by the spectral detection of a single on-resonance MDR mode compared with that obtained by the off-resonance MDR mode without compromise in transverse resolution.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 14 )