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Proceedings Paper

Multi-photon microscopy based on resonant four-wave mixing of colloidal quantum dots
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Paper Abstract

We demonstrate a novel multi-photon imaging modality based on the detection of four-wave mixing (FWM) from colloidal nanoparticles. Four-wave mixing is a third-order signal which can be excited and detected in resonance with the ground-state excitonic transition of CdSe/ZnS quantum dots. The coherent FWM signal is detected interferometrically to reject incoherent backgrounds for improved image contrast compared to fluorescence methods. We measure transversal and axial resolutions of 140nm and 590nm respectively, significantly beating the one-photon diffraction limit. We also demonstrate optical imaging of quantum-dot-labeled Golgi structures of HepG2 cells.

Paper Details

Date Published: 3 March 2009
PDF: 9 pages
Proc. SPIE 7189, Colloidal Quantum Dots for Biomedical Applications IV, 71890Z (3 March 2009); doi: 10.1117/12.807968
Show Author Affiliations
F. Masia, Cardiff Univ. (United Kingdom)
W. Langbein, Cardiff Univ. (United Kingdom)
P. Borri, Cardiff Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 7189:
Colloidal Quantum Dots for Biomedical Applications IV
Marek Osinski; Thomas M. Jovin M.D.; Kenji Yamamoto M.D., Editor(s)

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