Highly Subwavelength, Superdirective Cylindrical Nanoantenna.

@article{Arslanagi2018HighlySS,
  title={Highly Subwavelength, Superdirective Cylindrical Nanoantenna.},
  author={Samel Arslanagi{\'c} and Richard W. Ziolkowski},
  journal={Physical review letters},
  year={2018},
  volume={120 23},
  pages={
          237401
        }
}
A superdirective cylindrical nanoantenna is demonstrated with a multilayered cylindrical metamaterial-inspired structure. Targeting specific scattering coefficients for the dipole and higher-order modes, the ideal limit of needle radiation is demonstrated. A five-layer system is optimized to demonstrate its approach to the theoretical directivity bound. While the resulting structure is scalable to any frequency regime, its highly subwavelength overall size (λ_{0}/10) takes advantage of… 

Figures from this paper

Radiation-direction steerable nanoantennae
In this work, we design a novel reflection nanoantenna with a metasurface containing an array of silver nanoparticles. Moreover, an electro-optical (EO) layer is introduced to produce
Subwavelength Silicon Nanoblocks for Directional Emission Manipulation
TLDR
A single dielectric silicon nanoblock is theoretically proposed as an efficient, multifunctional and ultracompact all-dielectric nanoantenna to direct light into a preferential direction.
Multifrequency superscattering pattern shaping
Multifrequency superscattering is a phenomenon in which the scattering cross section from a subwavelength object simultaneously exceeds the single-channel limit at multiple frequency regimes. Here,
Graphene-coated resonators with frequency-selective super-scattering and super-cloaking
Comb-like behavior of the multilayered graphene wrapped nanotubes in multiple scattering channels is investigated and utilized to design a structure for simultaneous super-scattering and
Harnessing superdirectivity in dielectric spherical multilayer antennas
Small form-factor, narrowband, and highly directive antennas are of critical importance in a variety of applications spanning wireless communications, remote sensing, Raman spectroscopy, and single
Superdirective dielectric spherical multilayer antennae
TLDR
The stochastic optimization procedure is used to demonstrate superdirective designs of small all-dielectric antennas being spherical multilayer structure that possess the directivity that go beyond the conventional theoretical bounds for antennas smaller than the wavelength and outperform previously attained results.
Design principle of cylindrical superdirective antenna
We propose the design principle of a superdirective antenna with needle-like radiation based on multi-layered dielectric cylinder. The electromagnetic fields and far-field directivity of
Active coated nano rod antennas for enhanced and directive scattering phenomena
The scattering properties of a range of symmetric and asymmetric active coated nano rod antennas are investigated numerically. The active nano rods are composed of a silica dioxide nano-core coated
Enhancement of unidirectional forward scattering and suppression of backward scattering in hollow silicon nanoblocks.
TLDR
A novel nanoantenna composed of hollow silicon nanoblocks is designed to allow directional emission manipulation, and forward scattering is enhanced and backward scattering is restrained substantially in the visible region.
Directional control of narrow-band thermal emission from nanoantennas
Abstract. We investigate the directional control of narrow-band perfect thermal emission using a nanoscale Yagi–Uda antenna. Although Yagi–Uda antennas were demonstrated to achieve directional
...
...

References

SHOWING 1-10 OF 38 REFERENCES
Superdirective dielectric nanoantennas.
TLDR
The novel concept of superdirective nanoantennas based on the excitation of higher-order magnetic multipole moments in subwavelength dielectric nanoparticles are introduced, and it is revealed that the nanoantenna's high directivity is not associated with strong localization of near fields in the regime of reception.
Enhanced Directivity From Subwavelength Infrared/Optical Nano-Antennas Loaded With Plasmonic Materials or Metamaterials
Here, we explore theoretically the concept of enhanced directivity from electrically small subwavelength radiators containing negative-parameter materials, such as plasmonic materials with negative
Superbackscattering from single dielectric particles
We demonstrate that superbackscattering responses can be excited in subwavelength dielectric particles with simple geometries. The superbackscattering response arises from the simultaneous, coherent
Superscattering of light from subwavelength nanostructures.
TLDR
It is shown that, in principle, an arbitrarily large total cross section can be achieved, provided that one maximizes contributions from a sufficiently large number of channels.
Nanoradar based on nonlinear dimer nanoantenna.
TLDR
A nanoradar based on the operation of a nonlinear plasmonic nanoantenna demonstrates a wide scanning sector, low operation threshold, and ultrafast time response being potentially useful for many applications in nanophotonics circuitry.
Multipolar interference for directed light emission.
TLDR
This single-element antenna design robustly directs emission even when covered with nanometric emitters at random positions, outperforming previously demonstrated nanoantennas with a bandwidth of 200 nm and a directivity of 10.1 dB from a subwavelength structure.
Single molecule directivity enhanced Raman scattering using nanoantennas.
TLDR
Calculations show that Raman enhancement factors of 10(13) can be achieved by combined optimization of the local field enhancement (hotspot with 10(11) enhancement) and antenna directionality (with 10(2) enhancement).
Large-scale nanophotonic phased array
TLDR
This work demonstrates that a robust design, together with state-of-the-art complementary metal-oxide–semiconductor technology, allows large-scale NPAs to be implemented on compact and inexpensive nanophotonic chips and therefore extends the functionalities of phased arrays beyond conventional beam focusing and steering, opening up possibilities for large- scale deployment.
Wireless at the nanoscale: optical interconnects using matched nanoantennas.
TLDR
By properly loading and matching nanoantenna pairs with optical nanocircuits, this work theoretically demonstrate a complete optical wireless link that, in spite of some radiation loss and mismatch factors, may exhibit much less absorption loss, largely outperforming regular plasmonic waveguide links.
Ultra-directional forward scattering by individual core-shell nanoparticles.
TLDR
Ultra-directional forward scattering can be achieved by single nanoparticles without compromising the feature of backward scattering suppression, which may offer new opportunities for nanoantennas, photovoltaic devices, bio-sensing and many other interdisciplinary researches.
...
...