Nanoscale plasmonic contour bowtie antenna operating in the mid-infrared

Abstract

A plasmonic antenna design is proposed and investigated numerically over a large parameter space. By considering the contour of a bowtie antenna and introducing an additional design parameter, the contour thickness, it is demonstrated that the resonant wavelength of the antenna may be tuned over a broad spectral range while maintaining a constant antenna footprint. These new antennas allow for a factor of 3.6 reduction in the antenna footprint and an increase in the gap enhancement by 28%.

Highly Directive Hybrid Plasmonic Leaky Wave Optical Nano-Antenna

“…Introduction of the antenna concept into the optical near infrared and terahertz frequency regime holds promise for a wide range of novel applications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] including photo-detection [2,3], sensing [4], heat transfer [5,6], and spectroscopy [16].…”

“…Due to the very different behavior of metals at optical frequencies, with respect to the behavior of their counterpart at radio-band and microwave frequencies, a nano-antenna operating at optical frequencies is not a simple downscaled version of a microwave antenna. Therefore, recently different research groups around the world have been working to develop new methods to analyze [7,8], synthesize [9,10], and feed optical antennas [12] employing surface plasmon theory and rich antenna theory.…”

Integrated Broadband Bowtie Antenna on Transparent Silica Substrate

“…INTRODUCTION n recent years, bowtie antenna has been a hot topic for intense theoretical and experimental investigation, impelled by its unique features and advantages, including simple planar structure, stable broadband performance, strong near-field enhancement [1][2][3][4][5][6][7][8]. One simple configuration used to achieve broadband characteristics is a biconical antenna formed by two cones, and the bowtie antenna is a simplified two-dimensional structure using two triangular shapes separated by a small gap that resembles the shape of a bowtie [9,10].…”

Plasmonic slot nano-resonators in gold-coated microfibers

“…Nanoscale apertures in thin noble-metal films, with dimensions comparable to the light wavelength, can form plasmonic nano-resonators (PNRs) and such structures can concentrate an incident light field into a small volume which overcomes the diffraction limit with orders-of-magnitude intensity enhancement. So far, the transmission properties of plasmonic slot nano-resonators (PSNRs) have been studied under plane-wave excitation directed perpendicularly to the plane of the resonator [1,2].In this paper, we theoretically study a strongly-coupled 3D PSNR by embedding a slot nano-cavity in a plasmonic cylindrical waveguide formed by a thin-gold-film coated microfiber using 3D Finite Element Method. Light is launched from one end of the microfiber with 1 µm diameter and 30 nm gold layer and the various resonances can be identified simply monitoring the transmitted and reflected light.…”

“…Nanoscale apertures in thin noble-metal films, with dimensions comparable to the light wavelength, can form plasmonic nano-resonators (PNRs) and such structures can concentrate an incident light field into a small volume which overcomes the diffraction limit with orders-of-magnitude intensity enhancement. So far, the transmission properties of plasmonic slot nano-resonators (PSNRs) have been studied under plane-wave excitation directed perpendicularly to the plane of the resonator [1,2].…”