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2 December 2010 Faced folded rods as nano-antenna for optical devices
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Abstract
We propose faced folded rods (FFR) as nano-antenna for light emissions. This FFR structure, which is composed of two folded gold rods, shows two different field enhancement modes depending on the polarization direction of feeding light. Under the incidence of x-polarized light, double hot spots are observed at gaps due to capacitive coupling between rods. Meanwhile, when y-polarized light is applied to this geometry, a single hot spot is achieved at the center of the structure which is due to the superposition of half-wavelength dipole resonance occurring at each folded rod. Strong resonance of several vertices, which is predicted to be 100 of electric field enhancement factor in FFRs, can be achieved for sensitive bio-molecular detection. Thus, we can manipulate the number and position of desired hot spots by way of controlling the polarization state of light. Since we can obtain up to four different hot spot areas in nano-meter scale, multiplexed biosensing can be possible using FFRs as the nano-antenna. To understand the physical mechanism behind the pair type of folded rods, a single folded rod is first simulated as a basic elementary structure and compared with the pair structure. Then, this FFR structure is fabricated with an electron beam evaporator and the focused ion beam lithography. The scattered light intensity is captured by a CCD camera and compared with the simulation data.
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Taerin Chung, Jinyoung Choi, Yongjun Lim, Il-Min Lee, Kyoung-Youm Kim, and Byoungho Lee "Faced folded rods as nano-antenna for optical devices", Proc. SPIE 7851, Information Optics and Optical Data Storage, 78510S (2 December 2010); https://doi.org/10.1117/12.869812
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