Abstract
A self-similar cascades of three nanocrescents with progressively decreasing sizes and separations were proposed in this paper. Giant electric field was obtained in this structure using 3D-FDTD simulation. The maximum E-field enhancement about 9.7 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">*</sup> 10(4) was obtained with the polarization parallel to the axis of the chain, which is not only larger than the single crescent (6 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">*</sup> 10(4)) but also than the self-similar chain of three spheres (about 1 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">*</sup> 10(3)). While the maximum E-field enhancement is only about 3.1 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">*</sup> 10(4) for the polarization perpendicular to the axis of the chain, which is larger than the single crescent and the self-similar chain of three spheres. It's obvious that the hottest spot's location and the maximum E-field value depend on the polarization of incident light. These results show that this structure as a novel plasmonic resonator holds a great promise in application of surface-enhanced Raman scattering (SERS) substrate, nanooptical detection, nanooptical antenna and other applications.
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