Numerical simulation of field distribution of SERS active substrates for rhodamine 6G detection

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Numerical simulation of field distribution of SERS active substrates for rhodamine 6G detection

Hui-Wen Cheng, Yiming Li

Department of Electrical Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.

DOI:

https://doi.org/10.7494/cmms.2011.2.0356

Abstract:

In this work, we computationally study surface enhanced Raman spectroscopy (SERS) active substrates for the detection of Rhodamine 6G (R6G). To examine the electromagnetic enhancement, we first apply the finite-difference time domain (FDTD) algorithm to analyze the SERS active substrates by solving a set of Maxwell’s equations (Ampere’s Law and Faraday’s Law) in differential form. The local field enhancements are simulated in the visible regime with the wavelength of 633 nm. Through the three-dimensional (3D) FDTD simulation, we find that the vertical variations have relatively larger field enhancement than that of horizontal variations. The roughened surface is then fabricated with a 12-hour hydrothermal treatment process and the measured strong Raman intensity, following the Beckmann-Kirchhoff theory, is significantly larger than that without hydrothermal treated sample.

Cite as:

Cheng, H., & Li, Y. (2011). Numerical simulation of field distribution of SERS active substrates for rhodamine 6G detection. Computer Methods in Materials Science, 11(2), 369-374. https://doi.org/10.7494/cmms.2011.2.0356

Article (PDF):

Keywords:

SERS active substrate, Local field enhancement, Maxwell’s equations, Nanoparticular, FDTD simulation

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