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Multiphoton microscopy based on four-wave mixing of colloidal quantum dots

Masia, Francesco, Langbein, Wolfgang Werner and Borri, Paola 2008. Multiphoton microscopy based on four-wave mixing of colloidal quantum dots. Applied Physics Letters 93 (2) , 021114. 10.1063/1.2959737

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Abstract

We demonstrate a novel multiphoton imaging modality based on the detection of four-wave mixing (FWM) from colloidal nanoparticles. This third-order signal is excited and detected in resonance with the ground-state excitonic transition of CdSe/ZnS quantum dots. We measure transversal and axial resolutions of 140 and 590 nm, respectively, significantly improved compared to the one-photon diffraction limit. The coherent FWM signal is detected using a heterodyne technique which rejects incoherent background for improved image contrast compared to fluorescence methods. As sensitivity limit, we estimate a minimum number of 10 dots/√HZ detectable in the focal volume.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Physics and Astronomy
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Publisher: American Institute of Physics
ISSN: 0003-6951
Last Modified: 06 May 2019 20:59
URI: http://orca.cf.ac.uk/id/eprint/22326

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