Slow-light enhanced optical detection in liquid-infiltrated photonic crystals |
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Authors: | Martin E V Pedersen Lars S Rishøj Henrik Steffensen Sanshui Xiao Niels Asger Mortensen |
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Institution: | 1. MIC – Department of Micro and Nanotechnology, Nano DTU, Technical University of Denmark, ?rsteds Plads, DTU-building 345 East, 2800, Kongens Lyngby, Denmark
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Abstract: | Slow-light enhanced optical detection in liquid-infiltrated photonic crystals is theoretically studied. Using a scattering-matrix approach and the Wigner–Smith delay time concept, we show that optical absorbance benefits both from slow-light phenomena as well as a high filling factor of the energy residing in the liquid. Utilizing strongly dispersive photonic crystal structures, we numerically demonstrate how liquid-infiltrated photonic crystals facilitate enhanced light–matter interactions, by potentially up to an order of magnitude. The proposed concept provides strong opportunities for improving existing miniaturized absorbance cells for optical detection in lab-on-a-chip systems. |
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