Abstract
Surface enhanced Raman spectroscopy (SERS) is a rapid, sensitive, and efficient tool for detection/analysis of molecules based on enhancement of its Raman signals. Raman active molecules can be detected in trace quantities using SERS by coupling the electromagnetic energy at optical frequency. In this study, design of a robust SERS-active substrate has been proposed that is composed of gold hexagonal nano-patterns on SiO2. High enhancement of electric field strength (≈1010) was demonstrated using optimised substrate with standard laser sources (λ = 632 nm, and λ = 785 nm) for illumination. The proposed SERS substrate was found to respond to different analytes such as water, urea, and blood, with high sensitivity (Enhancement factor≈ 108-109). It is a versatile design that may find its application in bioanalysis/bio diagnostics, explosive detection, food adulteration etc. It was observed that variation of sharpness of corners of hexagonal patterns does not degrade the enhancement factor immensely. Fabrication of the proposed SERS substrate can be done by using existing nano-lithography tools such as e-beam lithography, focussed ion beam etc.
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