Tapered Yagi-Uda Nanoantennas for Broadband Unidirectional Emission

TL;DR

This paper demonstrates tapered Yagi-Uda nanoantennas that achieve broadband unidirectional emission, supported by experimental measurements and numerical calculations showing wide-band spectral resonances and near-field profile insights.

Contribution

The study introduces tapered Yagi-Uda nanoantennas with broadband unidirectional emission, validated through experiments and simulations, advancing nanoantenna design for wide-band applications.

Findings

Tapered nanoantennas show distinct wide-band spectral resonances.

Experimental transmittance spectra confirm broadband unidirectional emission.

Numerical calculations align with measured spectra and reveal near-field profiles.

Abstract

We demonstrate experimentally the operation of tapered Yagi-Uda nanoantennas for broadband unidirectional emission enhancement. The measured transmittance spectra show that, in comparison to untapered reference structures, the tapered nanoantennas exhibit distinct wide-band spectral resonances. The performed full-vectorial numerical calculations are in good qualitative agreement with the measured spectra, further revealing how the near-field profiles of the tapered nanoantennas are directly reflecting their broadband characteristics.