Optical modeling and computational analysis of tapered dome shaped nanoantenna

Ayush Paliwal; Jorawar Singh Dham; Ajeet Kumar; Lakshay Gautam

doi:10.1117/12.2320890

19 September 2018 Optical modeling and computational analysis of tapered dome shaped nanoantenna

Ayush Paliwal, Jorawar Singh Dham, Ajeet Kumar, Lakshay Gautam

Proceedings Volume 10722, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVI; 107222L (2018) https://doi.org/10.1117/12.2320890
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

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).

Citation Download Citation

Ayush Paliwal, Jorawar Singh Dham, Ajeet Kumar, and Lakshay Gautam "Optical modeling and computational analysis of tapered dome shaped nanoantenna", Proc. SPIE 10722, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVI, 107222L (19 September 2018); https://doi.org/10.1117/12.2320890

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KEYWORDS

Nanoantennas

Gold

Nanostructures

Domes

Optical spheres

Plasmonics

Resonance enhancement

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