Design and optimization of broadband and transparent SERS based on transformation optics

Mohammadrahim Kazemzadeh; Neil  Broderick; Weiliang Xu; Kamran Zargar Shoshtari

doi:10.1117/12.2541240

31 December 2019 Design and optimization of broadband and transparent SERS based on transformation optics

Mohammadrahim Kazemzadeh, Neil Broderick, Weiliang Xu, Kamran Zargar Shoshtari

Proceedings Volume 11201, SPIE Micro + Nano Materials, Devices, and Applications 2019; 112011L (2019) https://doi.org/10.1117/12.2541240
Event: ANZCOP, 2019, Melbourne, Australia

Abstract

In this work, a novel transparent surface-enhanced Raman scattering (SERS) for the application of probe sensing is presented. This SERS is made by a two-dimensional array of noble metal which contains nano bowls with scattered nanospheres on its surface. Using the theory of transformation optics, we show that the curvature of nano bowls amplify the electric field around the nanospheres. This amplification is broadband due to the inherent nature of space transformation which does not rely on frequency. Comparisons with conventional flat SERS are done to demonstrate the advantages of the present design. We show that the curvature of these nano bowls increases the volume of the hotspot by one order of magnitude. This significantly reduces the response time of the SERS. Also, it is shown that this curvature amplifies 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 candidate for single molecule detection. The optimization and simulations are done using the Finite Element numerical algorithm.

Citation Download Citation

Mohammadrahim Kazemzadeh, Neil Broderick, Weiliang Xu, and Kamran Zargar Shoshtari "Design and optimization of broadband and transparent SERS based on transformation optics", Proc. SPIE 11201, SPIE Micro + Nano Materials, Devices, and Applications 2019, 112011L (31 December 2019); https://doi.org/10.1117/12.2541240

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