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    Fluorescence Coupling to Internal Modes of 1D Photonic Crystals Characterized by Back Focal Plane Imaging

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    Author
    Choudhury, Sharmistha Dutta
    Xiang, Yifeng
    Zhang, Douguo
    Descrovi, Emilano
    Badugu, Ramachandram
    Lakowicz, Joseph R
    Date
    2021-02-18
    Journal
    Journal of Optics (2010)
    Publisher
    IOP Publishing Ltd
    Type
    Article
    
    Metadata
    Show full item record
    See at
    https://doi.org/10.1088/2040-8986/abd986
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8082491/
    Abstract
    The coupling of fluorescence with surface electromagnetic modes, such as surface plasmons on thin metal films or Bloch surface waves (BSW) on truncated one-dimensional photonic crystals (1DPC), are presently utilized for many fluorescence-based applications. In addition to the surface wave, 1DPCs also support other electromagnetic modes that are confined within the 1DPC structure. These internal modes (IMs) have not received much attention for fluorescence coupling due to lack of spatial overlap of their electric fields with the surface bound fluorophores. However, our recent studies have indicated that the fluorescence coupling with IMs occurs quite efficiently. This observed internal mode-coupled emission (IMCE) is (similar to BSW-coupled emission) indeed wavelength dependent, directional and S-polarized. In this paper, we have carried out back-focal plane (BFP) imaging to reveal that the IMs of 1DPCs can couple with surface bound excited dye molecules, with or without a BSW mode presence. Depending on the emission wavelength, the coupling is observed with BSW and IMs or only IMs of the 1DPC structure. The experimental results are well matching with numerical simulations. The occurrence of IMCE regardless of the availability of BSWs removes the dependence on just the surface mode for obtaining coupled emission from 1DPCs. The observation of IMCE is expected to widen the scope of 1DPCs for surface-based fluorescence sensing and assays.
    Keyword
    Back-focal plane imaging
    Bloch surface waves
    Fluorescence
    Internal modes
    One-dimensional photonic crystals
    Identifier to cite or link to this item
    http://hdl.handle.net/10713/15587
    ae974a485f413a2113503eed53cd6c53
    10.1088/2040-8986/abd986
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