Breaking the diffraction limit by saturation in stimulated-Raman-scattering microscopy: A theoretical study

Li Gong and Haifeng Wang
Phys. Rev. A 90, 013818 – Published 15 July 2014

Abstract

We present a theoretical investigation on the saturation of stimulated Raman scattering (SRS) and propose an application of it to break the diffraction limit in SRS microscopy. In our proposed scheme, a donut-shaped Stokes beam is used to saturate SRS at the rim of a focused Gaussian pump beam; thus the addition of another Gaussian Stokes beam can only induce additional stimulated Raman loss to the pump beam in a small area inside the donut-shaped beam. Resembling stimulated-emission-depletion microscopy, this method can significantly improve the lateral imaging resolution. Compared with the diffraction-limited resolution, theoretical simulations show that it may be possible to double the spatial resolution with a few TW/cm2 of laser intensity. Such super-resolution could greatly enhance the advantage of SRS microscopy for potential applications.

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  • Received 30 January 2014

DOI:https://doi.org/10.1103/PhysRevA.90.013818

©2014 American Physical Society

Authors & Affiliations

Li Gong and Haifeng Wang*

  • Department of Physics, National University of Singapore, Singapore, 117542

  • *phywh@nus.edu.sg

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Vol. 90, Iss. 1 — July 2014

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