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Issue 41, 2014
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A chemical sensor based on a photonic-crystal L3 nanocavity defined in a silicon-nitride membrane

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Abstract

The application of a silicon-nitride based L3 optical nanocavity as a chemical sensor is explored. It is shown that by adjusting the thickness of an ultra-thin Lumogen Red film deposited onto the nanocavity surface, the fundamental optical mode undergoes a progressive red-shift as the layer-thickness increases, with the cavity being able to detect the presence of a single molecular monolayer. The optical properties of a nanocavity whose surface is coated with a thin layer of a porphyrin-based polymer are also explored. On exposure of the cavity to an acidic-vapour, it is shown that changes in the optical properties of the porphyrin-film (thickness and refractive index) can be detected through a reversible shift in the cavity mode wavelength. Such effects are described using a finite difference time-domain model.

Graphical abstract: A chemical sensor based on a photonic-crystal L3 nanocavity defined in a silicon-nitride membrane

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Publication details

The article was received on 20 Jun 2014, accepted on 25 Aug 2014 and first published on 27 Aug 2014


Article type: Paper
DOI: 10.1039/C4TC01320D
Citation: J. Mater. Chem. C, 2014,2, 8700-8706
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    A chemical sensor based on a photonic-crystal L3 nanocavity defined in a silicon-nitride membrane

    K. Deasy, K. N. Sediq, S. Brittle, T. Wang, F. Davis, T. H. Richardson and D. G. Lidzey, J. Mater. Chem. C, 2014, 2, 8700
    DOI: 10.1039/C4TC01320D

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