Nanoantennas for visible and infrared radiation.
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TLDR
The role of plasmonic resonances on the performance of nanoantennas and the influence of geometrical parameters imposed by nanofabrication are discussed.Abstract:
Nanoantennas for visible and infrared radiation can strongly enhance the interaction of light with nanoscale matter by their ability to efficiently link propagating and spatially localized optical fields. This ability unlocks an enormous potential for applications ranging from nanoscale optical microscopy and spectroscopy over solar energy conversion, integrated optical nanocircuitry, opto-electronics and density-of-states engineering to ultra-sensing as well as enhancement of optical nonlinearities. Here we review the current understanding of metallic optical antennas based on the background of both well-developed radiowave antenna engineering and plasmonics. In particular, we discuss the role of plasmonic resonances on the performance of nanoantennas and address the influence of geometrical parameters imposed by nanofabrication. Finally, we give a brief account of the current status of the field and the major established and emerging lines of investigation in this vivid area of research.read more
Citations
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References
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Mapping the Plasmon Resonances of Metallic Nanoantennas
TL;DR: It is found that this scaling does not apply except in the extreme limit of very small, spherical nanoparticles, and a general, practical map of the resonances is provided for use in locating the desired response for gold nanoantennas.
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Optical rectification and field enhancement in a plasmonic nanogap
TL;DR: It is shown that nonlinear tunnelling conduction between gold electrodes separated by a subnanometre gap leads to optical rectification, producing a d.c. photocurrent when the gap is illuminated, and the measured field enhancements exceed 1,000, consistent with estimates from surface-enhanced Raman measurements.
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Input Impedance, Nanocircuit Loading, and Radiation Tuning of Optical Nanoantennas
Andrea Alù,Nader Engheta +1 more
TL;DR: The radiation features of optical nanoantennas are explored, analyzing the concepts of optical input impedance, optical radiation resistance, impedance matching, and loading of plasmonic nanodipoles to exploit the optimization of nanoantenna loading by optical nanocircuit elements.
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Toward Nanometer-Scale Optical Photolithography: Utilizing the Near-Field of Bowtie Optical Nanoantennas
TL;DR: Optically resonant metallic bowtie nanoantennas are utilized as fabrication tools for the first time, resulting in the production of polymer resist nanostructures <30 nm in diameter at record low incident multiphoton energy densities.
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Spectroscopic Mode Mapping of Resonant Plasmon Nanoantennas
TL;DR: Spatially resolved spectral mode mapping of resonant plasmon gap antennas using two-photon luminescence microspectroscopy is presented and shows a dynamical charge redistribution due to the near-field coupling between the two arms.