Numerical investigation of Ag-bullseye structure in surface enhanced Raman spectroscopy

Richa Goel; Yogita Sharma; Sibashish Chakraborty; Vimarsh Awasthi; Satish K. Dubey

doi:10.1117/12.2670021

11 May 2023 Numerical investigation of Ag-bullseye structure in surface enhanced Raman spectroscopy

Richa Goel, Yogita Sharma, Sibashish Chakraborty, Vimarsh Awasthi, Satish K. Dubey

Proceedings Volume 12638, Women in Optics and Photonics in India 2022; 126380N (2023) https://doi.org/10.1117/12.2670021
Event: Women in Optics and Photonics in India, 2022, Bangalore, India

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Abstract

Surface enhanced Raman scattering (SERS), a variant of Raman spectroscopy, is one of the most powerful analytical techniques which can be used to obtain detailed chemical information of molecules or molecular assemblies, with the potential to reach single molecule detection. It is rapid, highly sensitive, accurate and non-destructive detection technique. It finds extensive application in various fields such as: environmental monitoring, biology, defense, forensics etc. It can be observed when target analytes are present in the vicinity of a metallic surface, especially noble metals like Au or Ag, since their plasmonic resonances lie in the visible and NIR regions. We have provided a numerical design of Ag-bullseye structure that function as reproducible SERS probe in the visible frequency band by using FDTD method. The proposed pattern is robust (with respect to different design parameters) with high sensitivity ~ 10⁸, high uniformity and specificity, which assures that such substrate can be used for quantitative analysis, making SERS an indispensable tool for bio-diagnostics and bio-analysis. Surface enhanced Raman scattering (SERS), FDTD, Raman spectroscopy, nano-patterns, Raman enhancement factor (EF).

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Richa Goel, Yogita Sharma, Sibashish Chakraborty, Vimarsh Awasthi, and Satish K. Dubey "Numerical investigation of Ag-bullseye structure in surface enhanced Raman spectroscopy", Proc. SPIE 12638, Women in Optics and Photonics in India 2022, 126380N (11 May 2023); https://doi.org/10.1117/12.2670021

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