Optical nanoantennas

Krasnok, Alex; Maksymov, Ivan S.; Denisyuk, A.I.; Belov, Pavel A.; Miroshnichenko, Andrey E.; Simovski, Constantin; Kivshar, Yu. S.

doi:10.3367/ufne.0183.201306a.0561

Cited by 232 publications

(199 citation statements)

References 217 publications

(118 reference statements)

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“…Due to this property, they offer unique opportunities for applications such as optical communications 4 , photovoltaics 5 , non-classical light emission 6 , subwavelength light confinement and enhancement 7 , sensing 8 , and single-photon sources 9 . A specific type of optical nanoantennas, the Yagi-Uda array, has recently received a widespread attention in the literature 10 . Such nanoantennas consist of several small scatterers that operate similarly to their radio frequency analogues.…”

Section: Introductionmentioning

confidence: 99%

Dynamically reconfigurable metal-semiconductor Yagi-Uda nanoantenna

et al. 2017

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We propose a novel type of tunable Yagi-Uda nanoantenna composed of metal-dielectric (AgGe) core-shell nanoparticles. We show that, due to the combination of two types of resonances in each nanoparticle, such hybrid Yagi-Uda nanoantenna can operate in two different regimes. Besides the conventional nonresonant operation regime at low frequencies, characterized by highly directive emission in the forward direction, there is another one at higher frequencies caused by hybrid magneto-electric response of the core-shell nanoparticles. This regime is based on the excitation of the van Hove singularity, and emission in this regime is accompanied by high values of directivity and Purcell factor within the same narrow frequency range. Our analysis reveals the possibility of flexible dynamical tuning of the hybrid nanoantenna emission pattern via electron-hole plasma excitation by 100 femtosecond pump pulse with relatively low peak intensities ∼200 MW/cm 2 .

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Section: Introductionmentioning

confidence: 99%

Dynamically reconfigurable metal-semiconductor Yagi-Uda nanoantenna

et al. 2017

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“…We propose here to transpose the concept of antenna to the scale of the optics of the visible. In this case, the reduction of the scales imposes the realization of submicron structures, baptized nanoantennes [1][2][3][4][5]. The latter aim here to act as a relay between the near -field spaces (nano -sources and nanocollectors) and far -field (propagating waves) for the localized emission or reception of light.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Optical Nanoantenna Based on Structures Chiral Photonic Crystal

Zinelabiddine¹

2017

AJN

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“…Nanoantennas have broad applications (see Fig. 13) in photodetection, solar energy, light emission, sensing, microscopy, and (surface-enhanced Raman) spectroscopy (Bharadwaj et al 2009;Giannini et al 2011;Biagioni et al 2012;Krasnok et al 2013). Currently, the tools of nanoscience and nanotechnology, such as focused ion beam milling (Muhlschlegel et al 2005), electron-beam lithography (Kinkhabwala et al 2009), and self-assembly schemes (Kalkbrenner et al 2005), enable fabrication of nanoantennas down to nanoscales.…”

Section: Optical Nanoantennasmentioning

confidence: 99%

“…This is also identical to classical antennas. However, considering internal losses of the emitter itself, an internal efficiency is defined as (Krasnok et al 2013)…”

Section: Absorption Scattering and Extinction Cross Sectionsmentioning

confidence: 99%

Numerical Modeling in Antenna Engineering

Chew

Jiang

Sun

et al. 2015

Handbook of Antenna Technologies

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The principal computational electromagnetics techniques for solving antenna problems are reviewed. An introduction is given on a historical review of how antenna problems were solved in the past. The call for precise solutions calls for the use of numerical methods as found in computational electromagnetics. A brief introduction on differential equation solutions and integral solutions is given. The Green's function concept is introduced to facilitate the formulation of integral equations. Numerical methods and fast algorithms to solve these equations are discussed.Then an overview of how electromagnetic theory relates to circuit theory is presented. Then the concept of partial element equivalence circuit is introduced to facilitate solutions to more complex problems. In antenna technology, one invariably has to have a good combined understanding of the wave theory and circuit theory.Next, the discussion on the computation of electromagnetic solutions in the "twilight zone" where circuit theory meets wave theory was presented. Solutions valid for the wave physics regime often become unstable facing low-frequency catastrophe when the frequency is low.Due to advances in nanofabrication technology, antennas can be made in the optical frequency regime. But their full understanding requires the full solutions of Maxwell's equations. Also, many models, such as perfect electric conductors, which are valid at microwave frequency, are not valid at optical frequency. Hence, many antenna concepts need rethinking in the optical regime.Next, an emerging area of the use of eigenanalysis methods for antenna design is discussed. This can be the characteristic mode analysis or the natural mode analysis. These analysis methods offer new physical insight not possible by conventional numerical methods.Then the discussion on the use of the domain decomposition method to solve highly complex and multi-scale antenna structures is given. Antennas, due to the need to interface with the circuit theory, often have structures ranging from a fraction of a wavelength to a tiny fraction of a wavelength. This poses a new computational challenge that can be overcome by the domain decomposition method.Many antenna designs in the high-frequency regime or the ray optics regime are guided by ray physics and the adjoining mathematics. These mathematical techniques are often highly complex due to the rich physics that come with ray optics. The discussion on the use of these new mathematical techniques to reduce computational workload and offering new physical insight is given.A conclusion section is given to summarize this chapter and allude to future directions.

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Optical nanoantennas

Cited by 232 publications

References 217 publications

Dynamically reconfigurable metal-semiconductor Yagi-Uda nanoantenna

Dynamically reconfigurable metal-semiconductor Yagi-Uda nanoantenna

Optimization of Optical Nanoantenna Based on Structures Chiral Photonic Crystal

Numerical Modeling in Antenna Engineering

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