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Designing Structures that Maximize Spatially Averaged Surface-Enhanced Raman Spectra

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posted on 2023-01-12, 15:58 authored by Wenjie Yao, Francesc Verdugo, Henry O. Everitt, Rasmus E. Christiansen, Steven G. Johnson
We present a general framework for inverse design of nanopatterned surfaces that maximize spatially averaged surface-enhanced Raman (SERS) spectra from molecules distributed randomly throughout a material or fluid, building upon a recently proposed trace formulation for optimizing incoherent emission. This leads to radically different designs than optimizing SERS emission at a single known location, as we illustrate using several 2D design problems addressing effects of hot-spot density, angular selectivity, and nonlinear damage. We obtain optimized structures that perform about 4 times better than coating with optimized spheres or bowtie structures and about 20 times better when the nonlinear damage effects are included.



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