Abstract

Localized surface plasmon has been widely used on surface-enhanced Raman scattering (SERS) spectroscopy. Coupling between two metal surfaces that are separated only few nanometers bring localized surface plasmon to resonant at the gap and induce large electromagnetic field (E) enhancement. This work is to present a SERS amplifying antenna for the near infrared region. Instead of the visible-light range amplifying antenna such as a bowtie, the simulation results indicate that ellipse antenna could provide large E enhancement at near infrared wavelength by combing the free-standing magnifying property with large aspect ratios of the ellipse geometry. The resonance wavelength shows red shift as the aspect ratio of ellipse disk increases which is in agreement with both the simulation result and analytical result based on Lorentz-Mie theory.

© 2013 Japan Society of Applied Physics, Optical Society of America