Bow-tie nano-antennas are the kind of plasmonic structures that are widely used in optical applications to obtain strong electric fields in a limited volume. Their capability to enhance the incident light can be greatly improved by constructing these structures from several alternating metal/dielectric layers. Following this approach, we introduce and then analyze the performance of a multilayered Au/SiO₂ bow-tie nano-antenna in the finite-difference time-domain software. We show that the gold/silica thickness ratio of 50% leads to the improvement of the electric field enhancement on almost 50%, when compared to a monolithic gold device, which makes the proposed design attractive for various sensing applications.

Date Published: 18 April 2017
PDF: 5 pages
Proc. SPIE 10252, Optical Manipulation Conference, 1025217 (18 April 2017); doi: 10.1117/12.2269381

Published in SPIE Proceedings Vol. 10252:
Optical Manipulation Conference
Takashige Omatsu, Editor(s)