Enhancing Light Absorption in a Nanovolume with a Nanoantenna: Theory and Figure of Merit

Sakat, Emilie; Wojszvzyk, Léo; Hugonin, Jean‐Paul; Sauvan, Christophe

doi:10.1021/acsphotonics.0c00329

Cited by 6 publications

(4 citation statements)

References 42 publications

(77 reference statements)

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“…The resonant interaction between an electromagnetic wave and a scatterer is limited by physical bounds [29,[51][52][53]. Physical bounds can be described by the maximum of the electromagnetic radiation that can be absorbed by a scatterer in a homogeneous or complex environment [28,44,[54][55][56][57][58][59]. Physical bounds can also be described by the maximum of electromagnetic scattering.…”

Section: Upper Bound: Unitary Limitmentioning

confidence: 99%

Poles, physical bounds, and optimal materials predicted with approximated Mie coefficients

et al. 2021

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Resonant electromagnetic scattering with particles is a fundamental problem in electromagnetism that has been thoroughly investigated through the excitation of localized surface plasmon resonances (LSPR) in metallic particles or Mie resonances in high refractive index dielectrics. The interaction strength between electromagnetic waves and scatterers is limited by maximum and minimum physical bounds. Predicting the material composition of a scatterer that will maximize or minimize this interaction is an important objective but its analytical treatment is challenged by the complexity of the functions appearing in the multipolar Mie theory. Here, we combine different kinds of expansions adapted to the different functions appearing in Mie scattering coefficients to derive simple and accurate expressions of the scattering electric and magnetic Mie coefficients in the form of rational functions. We demonstrate the accuracy of these expressions for metallic and dielectric homogeneous particles before deriving the analytical expressions of the complex eigen-frequencies (poles) for both cases. Approximate Mie coefficients can be used to derive in a simple but accurate expressions the complex dielectric permittivities that will yield a pole of the dipolar Mie coefficient and to ideal absorption conditions. The same expressions also predict the real dielectric permittivities that maximize (unitary limit) or minimize (anapole) electromagnetic scattering.

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Section: Upper Bound: Unitary Limitmentioning

confidence: 99%

Poles, physical bounds, and optimal materials predicted with approximated Mie coefficients

et al. 2021

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“…Optical nanoantennas act as effective transducers between the near-and far-field regions of these nanoemitters, and as such they have been widely applied for manipulating the interaction between light and matter [6]. To date, several schemes have been used to engineer the emitter properties, including tuning excitation [7], decay rate [8], polarization [9], frequency conversion [10,11], spectral modulation [12], nonlinear processes [13] and emission direction [14,15]. The most commonly used design for directional emission is based on the Yagi-Uda geometry [14][15][16][17] inspired by radiofrequency devices.…”

Section: Introductionmentioning

confidence: 99%

Optical Ultracompact Directional Antennas Based on a Dimer Nanorod Structure

et al. 2022

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Controlling directionality of optical emitters is of utmost importance for their application in communication and biosensing devices. Metallic nanoantennas have been proven to affect both excitation and emission properties of nearby emitters, including the directionality of their emission. In this regard, optical directional nanoantennas based on a Yagi–Uda design have been demonstrated in the visible range. Despite this impressive proof of concept, their overall size (~λ2/4) and considerable number of elements represent obstacles for the exploitation of these antennas in nanophotonic applications and for their incorporation onto photonic chips. In order to address these challenges, we investigate an alternative design. In particular, we numerically study the performance of a recently demonstrated “ultracompact” optical antenna based on two parallel gold nanorods arranged as a side-to-side dimer. Our results confirm that the excitation of the antiphase mode of the antenna by a nanoemitter placed in its near-field can lead to directional emission. Furthermore, in order to verify the feasibility of this design and maximize the functionality, we study the effect on the directionality of several parameters, such as the shape of the nanorods, possible defects in the dimer assembly, and different positions and orientations of the nanoemitter. We conclude that this design is robust to structural variations, making it suitable for experimental upscaling.

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“…Extensive research has been performed over the last decade on mmWave (e.g., [12,13]), terahertz (e.g., [14][15][16][17][18][19][20][21][22][23]), plasmonic (e.g., [24][25][26][27][28][29]) and optical (e.g., [30][31][32][33][34]) antennas, with the researchers being focused on the following: (a) applying established microwave frequencies techniques at these high frequencies (e.g., [35,36]); (b) identifying suitable materials that are appropriate for design at frequencies over 100 GHz (e.g., [18,23]); or (c) identifying appropriate and low-cost fabrication approaches (e.g., [32,[37][38][39]). In this work, we are focused on the first thrust.…”

Section: Introductionmentioning

confidence: 99%

An Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies

Paschaloudis¹,

Zekios²,

Trichopoulos³

et al. 2021

Electronics

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In this work, we present a rigorous full-wave eigenanalysis for the study of nanoantennas operating at both terahertz (THz) (0.1–10 THz), and infrared/optical (10–750 THz) frequency spectrums. The key idea behind this effort is to reveal the physical characteristics of nanoantennas such that we can transfer and apply the state-of-the-art antenna design methodologies from microwaves to terahertz and optics. Extensive attention is given to penetration depth in metals to reveal whether the surface currents are sufficient for the correct characterization of nanoantennas, or the involvement of volume currents is needed. As we show with our analysis, the penetration depth constantly reduces until the region of 200 THz; beyond this point, it shoots up, requiring volume currents for the exact characterization of the corresponding radiating structures. The cases of a terahertz rectangular patch antenna and a plasmonic nanoantenna are modeled, showing in each case the need of surface and volume currents, respectively, for the antenna’s efficient characterization.

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Enhancing Light Absorption in a Nanovolume with a Nanoantenna: Theory and Figure of Merit

Cited by 6 publications

References 42 publications

Poles, physical bounds, and optimal materials predicted with approximated Mie coefficients

Poles, physical bounds, and optimal materials predicted with approximated Mie coefficients

Optical Ultracompact Directional Antennas Based on a Dimer Nanorod Structure

An Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies

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