29 April 2016 Method for enhanced infrared spectroscopy of molecules with nanorod arrays
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Abstract
Recent studies led in the field of infrared spectroscopy focused on the use of nanoantennas to enhance electromagnetic field on the bonds of molecules, in order to improve detection. We propose to take benefit from dipolar optical resonances in dielectric free-standing nanorod arrays as an innovative component to achieve spectroscopy in the mid-infrared wavelength range. The particularity of this component is not only to allow electromagnetic field enhancement, but also its ability to shift spectrally the resonance according to incidence angle. Spectroscopy is thus possible on a wide wavelength range for a given geometry of the nanorods. We present here numerical studies of the impact of the size of nanorods on the reflection spectra. We use the permittivity of a test molecule determined by transmission spectra. In addition, we introduce the fabrication process, transmission and reflection measurements of nanorods.
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Clément Tardieu, Grégory Vincent, Nathalie Bardou, Riad Haïdar, Stéphane Collin, "Method for enhanced infrared spectroscopy of molecules with nanorod arrays", Proc. SPIE 9899, Optical Sensing and Detection IV, 98990L (29 April 2016); doi: 10.1117/12.2227635; https://doi.org/10.1117/12.2227635
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