20 February 2017 Optical coupling effects on the performance of 3D SERS bio-sensors
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Abstract
While a wide range of substrate formats have been proposed for surface enhanced Raman scattering (SERS) applications, the challenge remains in designing a reproducible high efficiency SERS substrate [1]. In part, this is due to the disconnect between the local field enhancement spectra and the localized surface plasmon resonance (LSPR) spectra commonly used to characterize SERS substrates [2]. It remains a challenge to directly evaluate the sensor performance. In this work, we report a systematic study of optical coupling in SERS substrates by measuring the sensor performance across the visible and near-infrared spectral range. Using the experimental SERS scattering cross section measurements of two distinct peaks we compute the best-fit curve for the field enhancement. Using the field enhancement profile we calculate the full sensor performance maps for both Stokes and anti-Stokes shifts and evaluate the optimal pump laser wavelengths for SERS spectroscopy application.
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A. Polyakov, A. Polyakov, A. Rogacs, A. Rogacs, } "Optical coupling effects on the performance of 3D SERS bio-sensors", Proc. SPIE 10112, Photonic and Phononic Properties of Engineered Nanostructures VII, 101120T (20 February 2017); doi: 10.1117/12.2250436; https://doi.org/10.1117/12.2250436
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