Nonlinear Optical Response from Arrays of Au Bowtie Nanoantennas

Abstract

We demonstrate that the optical response of a single Au bowtie nanoantenna can be favorably modified to increase the local intensity by a factor of 10(3) in the feed gap region when a periodic array of antennas are used. We find that the array periodicity can be used to modulate and shape the spectral emission. An analysis of the emission confirms the presence of second-harmonic generation and two-photon photoluminescence, typical of gold nanostructures, but also reveals a portion of the emitted spectrum that cannot be attributed to a single multiphoton process. Our investigations have important implications for understanding the role of resonant nanostructures in designing optical antennas for next-generation photonic technologies.

Understanding and controlling plasmon-induced convection

“…The collaborative effect of nanoplasmonic arrays has been previously shown to shift the peak resonance and increase the field enhancement properties of individual antennas 5,29 ; however, few studies have explored the heating effects of such arrays. To this end, our work provides insight into the physics of plasmonic arrays by showing that diffractive effects enable elements outside of the excited region of the input field to participate in the heating process, thereby increasing maximum temperature and enhancing fluid velocities 26 .…”

“…P lasmonic systems are drawing much attention due to their broad applications in several fields such as biology 1 , sensing 2 , nanoscale heating 3 , nonlinear optics 4,5 , optofluidics [6][7][8] and optical trapping [9][10][11][12][13][14] . Indeed, light-absorbing nanotextured surfaces such as those utilizing metal pads, dipole antennas and bowtie nanoantennas have recently been shown to be very effective for optical manipulation 9,13,15 .…”

Regioselective Localization and Tracking of Biomolecules on Single Gold Nanoparticles

“…A consequence of the interaction is the ability to concentrate light fields with orders of magnitude enhancement at visible and near infrared (NIR) wavelengths to the subwavelength scale. Such enhancements find profound applications in improving the efficiencies of several phenomena such as fluorescence,1, 2, 3 surface‐enhanced Raman spectroscopy (SERS),4, 5, 6, 7, 8 surface‐enhanced infrared absorption,9, 10, 11 single‐molecule detection,12, 13 nonlinear optical effects,14, 15, 16 and multiphoton polymerization 17, 18. Exploiting this highly confined optical field is crucial, but simultaneously it is also challenging to position the desired molecules or particles accurately at these locations.…”

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].…”

“…In addition, the resonant frequency of a bowtie antenna can be designed and tuned by appropriately modifying and scaling the bowtie geometry, such as its arm length, flare angle, and feed gap width. This enables the bowtie antenna to have various applications over a wide frequency range, including extremeultraviolet light generation [2], optical antennas [3,16,5], Terahertz-wave optoelectronics [17], mid-infrared plasmonic antennas and sensors [8,18], microwave radar [7], wireless communications [4,19], flexible RF devices [20], complex electromagnetic structures [21], and photonic detection of freespace electromagnetic waves [22][23][24].…”