Liquid-infiltrated photonic crystals: enhanced light-matter interactions for lab-on-a-chip applications

Niels Asger Mortensen, Sanshui Xiao, Jesper Goor Pedersen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Optical techniques are finding widespread use in analytical chemistry for chemical and bio-chemical analysis. During the past decade, there has been an increasing emphasis on miniaturization of chemical analysis systems and naturally this has stimulated a large effort in integrating microfluidics and optics in lab-on-a-chip microsystems. This development is partly defining the emerging field of optofluidics. Scaling analysis and experiments have demonstrated the advantage of micro-scale devices over their macroscopic counterparts for a number of chemical applications. However, from an optical point of view, miniaturized devices suffer dramatically from the reduced optical path compared to macroscale experiments, e.g. in a cuvette. Obviously, the reduced optical path complicates the application of optical techniques in lab-on-a-chip systems. In this paper we theoretically discuss how a strongly dispersive photonic crystal environment may be used to enhance the light-matter interactions, thus potentially compensating for the reduced optical path in lab-on-a-chip systems. Combining electromagnetic perturbation theory with full-wave electromagnetic simulations we address the prospects for achieving slow-light enhancement of Beer-Lambert-Bouguer absorption, photonic band-gap based refractometry, and high-Q cavity sensing.
    Original languageEnglish
    JournalMicrofluidics and Nanofluidics
    Volume4
    Issue number1-2
    Pages (from-to)117-127
    ISSN1613-4982
    DOIs
    Publication statusPublished - 2008

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