Abstract
Optical antenna or nanoantenna, which can control the optical signal radiation and manipulate the light energy at the tiny region, has attracted more attentions for various applications during these years [1, 2]. For example, the nanoplasmonic structures were used to enhance the surface enhanced Raman scattering (SERS) signals for biological or chemical sensing application [3, 4]. A. Ahmed and R. Gordon put a circular reflector around the optical dipole antenna to boost the Raman signals and studied the emission pattern of the radiated signal from the directive optical antenna [5, 6]. Because the spot size of the exciting source is usually larger than the nanoantenna area, the surrounding light energy could not be all focused on the gap of the optical antenna. On the other hand, the bull’s eye structures can be used for collecting light energy into the center of the rings [7]. Thus, we propose to study a structure which combines the bull’s eye structure and optical antenna with a reflective layer beneath it.
© 2013 Japan Society of Applied Physics, Optical Society of America
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