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Volume 153, 2011
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Coherent control of vibrational transitions: Discriminating molecules in mixtures

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Abstract

Identifying complex molecules often entails detection of multiple vibrational resonances, especially in the case of mixtures. Phase shaping of broadband pump and probe pulses allows for the coherent superposition of several resonances, such that specific molecules can be detected directly and with high selectivity. Our particular implementation of coherent anti-Stokes Raman scattering (CARS) spectroscopy and imaging employs broadband pump and probe fields in combination with a narrowband Stokes field. We describe our approach for combining spectral phase shaping and closed-loop optimization strategies to perform chemically-selective microscopy. To predict the optimal excitation profile we employ evolutionary algorithms that use the vibrational phase responses of five distinct molecules with overlapping resonances and investigate the effect of phase instability on the optimization. We have recently shown that modified polynomials and orthogonal rational functions can give rise to improved contours for CARS fitness landscapes. Now, by considering the landscapes associated with different basis sets, we introduce two figures of merit to quantitatively rank basis functions in terms of their “appropriateness” for modeling nonlinear phase-shaped processes.

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Publication details

The article was received on 13 Mar 2011, accepted on 11 May 2011 and first published on 20 Jul 2011


Article type: Paper
DOI: 10.1039/C1FD00040C
Citation: Faraday Discuss., 2011,153, 227-235
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    Coherent control of vibrational transitions: Discriminating molecules in mixtures

    A. C. W. van Rhijn, A. Jafarpour, M. Jurna, H. L. Offerhaus and J. L. Herek, Faraday Discuss., 2011, 153, 227
    DOI: 10.1039/C1FD00040C

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