In this work, a novel transparent surface-enhanced Raman scattering (SERS) for the application of probe sensing ispresented. This SERS is made by a two-dimensional array of noble metal which contains nano bowls with scatterednanospheres on its surface. Using the theory of transformation optics, we show that the curvature of nano bowlsamplify the electric field around the nanospheres. This amplification is broadband due to the inherent nature of spacetransformation which does not rely on frequency. Comparisons with conventional flat SERS are done to demonstrate theadvantages of the present design. We show that the curvature of these nano bowls increases the volume of the hotspot byone order of magnitude. This significantly reduces the response time of the SERS. Also, it is shown that this curvatureamplifies the electric field in hotspot more than hundreds of times greater than SERS without using those nano bowls.The calculated amplification of the Raman signal is more than one billion times so this surface is a promising candidatefor single molecule detection. The optimization and simulations are done using the Finite Element numerical algorithm.
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