Integration of bow-tie plasmonic nanoantennas on tapered fibers

In this article, a new and flexible approach to control the electric field enhancement of bow-tie nano-antennas by integrating them on the lateral of a tapered optical fiber is proposed. The device is driven by a Q-switched laser and the performance of a fabricated nano-antenna in a quartz slide is tested by a Surface Enhanced Raman Scattering (SERS) experiment. A refractive index sensing experiment is also performed and a sensitivity of (240 ± 30) nm/RIU is found in the 1.33-1.35 index rangeThe Asian Office of Aerospace Research and Development (AOARD US Air Force FA2386- 15-1-4084); Australian Research Council (ARC LP160100253); and São Paulo Research Foundation (FAPESP) (#2014/50632-6)