Ground-state depletion for subdiffraction-limited spatial resolution in coherent anti-Stokes Raman

TitleGround-state depletion for subdiffraction-limited spatial resolution in coherent anti-Stokes Raman
Publication TypeJournal Article
Year of Publication2012
AuthorsC. Cleff, P. Groß, C. Fallnich, H.L Offerhaus, J. Herek, K. Kruse, W.P Beeker, C.J Lee, K.J Boller
JournalPHYSICAL REVIEW A
Volume86
Start Page023825
Pagination023825
Date PublishedAug-2012
Type of ArticleJournal article
Abstract

We theoretically investigate ground-state depletion for subdiffraction-limited spatial resolution in coherent anti-Stokes Raman scattering (CARS) microscopy. We propose a scheme based on ground-state depopulation, which is achieved via a control laser light field incident prior to the CARS excitation light fields. This ground-state depopulation results in a reduced CARS signal generation. With an appropriate choice of spatial beam profiles, the scheme can be used to increase the spatial resolution. Based on the density matrix formalism we calculate the CARS signal generation and find a CARS signal suppression by 75% due to ground-state depletion with a single control light field and by using two control light fields the CARS signal suppression can be enhanced to 94%. Additional control light fields will enhance the CARS suppression even further. In case of a single control light field we calculate resulting CARS images using a computer-generated test image including quantum and detector noise and show that the background from the limited CARS suppression can be removed by calculating difference images, yielding subdiffraction-limited resolution where the resolution achievable depends only on the intensity used.

URLhttp://link.aps.org/doi/10.1103/PhysRevA.86.023825
DOI10.1103/PhysRevA.86.023825
Division

nSI

Department

EUV-Lab

PID

10b5d9bb3f8544739d6ff88ef4f0ce53

Alternate TitlePhys. Rev. A

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