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5 March 2019 Simulation and design of plasmonic gold bowtie nanoantennas
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Using surface-enhanced Raman spectroscopy (SERS), an electric field can be manipulated to map biochemical reactions in real time. The goal of this lab study will impact bio-photonics, material science, and electrical engineering fields by providing methods of Raman signal enhancement. This work involves use of nanoantennas, a nanoscale antenna like structures used for sending and transmitting electromagnetic waves. This project will present the optimization steps within the nanoantenna’s design. The team used computer simulation technology (CST) studio to perform electromagnetic simulations by modeling various bowtie nanoantenna geometries to obtain an optimized structure based on varying gap distances, side lengths, and layer thicknesses. These findings are then used to optimize bowtie nanoantenna designs. The presented CST simulations display trends producing a model of an optimized design. The design parameters that were varied are the side lengths of the nanoantennas ranging from 80-110 nanometers (nm), the gap distances between the nanoantenna pairs ranging from 20-40 nm, and the gold thickness layer ranging from 15-45 nm. We have chosen to use fixed wavelength input for our model that matches our own Raman instrument, a Jobin Yvon BX41 Confocal Raman microscope, which is equipped with a 532 nm excitation source. Results are displayed in a maximum volts/meter (V/m) calculation which is shown numerically and on a 3D phase plot. Using this data, the optimized design was found and is used to aid in biochemical reaction detection. In a brief description of our final design from CST simulation our lab found a 90nm side dimension followed by a 20nm gap distance with a 15nm gold thickness was the most optimized design.
Conference Presentation
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Matthew Hren, Caroline Campbell, Abigail Casey, and Gregory Triplett "Simulation and design of plasmonic gold bowtie nanoantennas", Proc. SPIE 10891, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVI, 108910M (5 March 2019); doi: 10.1117/12.2510678;

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