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Proceedings Paper

Optical modeling and computational analysis of tapered dome shaped nanoantenna
Author(s): Ayush Paliwal; Jorawar Singh Dham; Ajeet Kumar; Lakshay Gautam
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Paper Abstract

We present a novel design for an axisymmetric, three-dimensional tapered dome shaped nanoantenna structure similar to nanocones. The proposed design is modelled and analyzed using numerical simulation employing the finite element method (FEM) on COMSOL. Tapered structures have emerged as promising devices in efficiently guiding and localizing free-space radiation near the apex when excited by an external electric field, thus promoting a stronger light–matter interaction. Such metallic vertically tapered structures similar to nanocones provide strong filed enhancement at the tip when the resonance condition is fulfilled and hence most design applications of such structures rely on excitation produced at the tip. In this study the traditional nanocone structure is modified to form a tapered minaret structure comprised of multiple layers and an onion-shaped crown. Enhancement factors of the order of 104 are obtained at the tip at resonance with high directivity, thus providing an accessible hot spot. These features make the structure particularly suitable for use as nanoprobes for tip-enhanced Raman spectroscopy (TERS), scanning nearfield optical microscopy (SNOM), and surface plasmon polaritons enhanced Raman scattering (SPPERS).

Paper Details

Date Published: 19 September 2018
PDF: 6 pages
Proc. SPIE 10722, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVI, 107222L (19 September 2018); doi: 10.1117/12.2320890
Show Author Affiliations
Ayush Paliwal, Delhi Technological Univ. (India)
Jorawar Singh Dham, Delhi Technological Univ. (India)
Ajeet Kumar, Delhi Technological Univ. (India)
Lakshay Gautam, Univ. of Illinois (United States)

Published in SPIE Proceedings Vol. 10722:
Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVI
Din Ping Tsai; Takuo Tanaka, Editor(s)

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