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Broadband Optical Response in Ternary Tree Fractal Plasmonic Nanoantenna

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Abstract

The ability to precisely tailor lineshapes, operational bandwidth, and localized electromagnetic field enhancements (“hot spots”) in nanostructures is currently of interest in advancing the performance of plasmonics-based chemical and biological sensing techniques. Fractal geometries are an intriguing alternative in the design of plasmonic nanostructures as they offer tunable multiband response spanning the visible and infrared spectral regions. A numerical study of the optical behavior of ternary tree fractal plasmonic nanoantenna is presented. Self-similar features are seen to emerge in the extinction spectra with the increase in fractal order N of the tree structure. Plasmon oscillations occurring at different length scales are shown to correspond to the multiple peaks and are compared with the spatial maps of electric field enhancement at the surface of the nanoantenna. The multiple peaks are shown to be independently tunable by structural variation. The robustness of the spectral response and polarization dependence arising due to various asymmetries is discussed.

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Authors and Affiliations

  1. Department of Electrical Engineering, Indian Institute of Technology, Gandhinagar, VGEC Campus, Chandkheda, Ahmedabad, 382424, Gujarat, India

    Ravi S. Hegde

  2. Department of Electronics and Photonics, A*STAR Institute of High Performance Computing, 1 Fusionopolis Way, #16-16, Connexis North, 138632, Singapore

    E. H. Khoo

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  1. Ravi S. Hegde
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  2. E. H. Khoo
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Correspondence to Ravi S. Hegde.

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Hegde, R.S., Khoo, E.H. Broadband Optical Response in Ternary Tree Fractal Plasmonic Nanoantenna. Plasmonics 11, 465–473 (2016). https://doi.org/10.1007/s11468-015-0059-3

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  • DOI: https://doi.org/10.1007/s11468-015-0059-3

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