Enhanced second-harmonic generation from magnetic resonance in AlGaAs nanoantennas

Carletti, Luca; Locatelli, Andrea; Stepanenko, Oleksandr; Leo, Giuseppe; Angelis, C. De

doi:10.1364/oe.23.026544

Cited by 215 publications

(204 citation statements)

References 26 publications

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“…Conversely, in AlGaAs nanoantennas we can have a strong volume contribution since this III-V alloy possesses a non-centrosymmetric crystalline structure. This could potentially enhance the SH conversion efficiency 19 . For the analysis of the second order nonlinear optical response leading to SHG we use frequency domain simulations where the nonlinear polarization induced by the χ (2) of the material is used to estimate the nonlinear currents driving the nanoantenna optical response.…”

Section: Second Harmonic Generationmentioning

confidence: 99%

“…Such unique optical properties have paved the way for new potential applications such as directional scattering [12][13][14] , surface enhanced vibrational spectroscopy 15,16 , and flat metasurfaces for phase-front engineering 5,17 . Besides linear optics applications, all-dielectric nanoantennas offer unique opportunities for the enhancement of nonlinear optical phenomena [18][19][20][21][22][23] . In these last two years only a few experimental investigations of the nonlinear optical response generated from resonant optical modes in all-dielectric nanoantennas have been conducted 18,20,21 and all of them have used silicon as the nonlinear material.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore volume χ (2) interactions are absent because silicon has a centrosymmetric crystalline structure. In this perspective AlGaAs offers a strong potential to efficiently boost second order nonlinear optical effects such as Second-Harmonic Generation (SHG) 19 . Not only AlGaAs possesses a strong second and third order nonlinear optical response in the NIR, but also by engineering the Al molar fraction in the alloy composition one can avoid TPA at wavelengths close to 1.55 μm.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced second-harmonic generation driven from magnetic dipole resonance in AlGaAs nanoantennas

et al. 2016

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Section: Second Harmonic Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced second-harmonic generation driven from magnetic dipole resonance in AlGaAs nanoantennas

et al. 2016

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“…Only very recently, thanks to the dramatic improvement of nanofabrication techniques, the integration of semiconducting materials has been pushed even further with the realization of nanoscale platforms featuring efficient second-order nonlinear processes. Recently, a nanoscale system based on AlGaAs nanodisks pumped in the telecom range (λ ≈ 1554 nm), at coincidence with the magnetic dipolar resonance, was theoretically proposed as an efficient system to enhance second-order nonlinear effects in nanoscale optics [27]. Soon after, three independent experiments validated these theoretical predictions [28–30].…”

Section: Introductionmentioning

confidence: 98%

Metal–dielectric hybrid nanoantennas for efficient frequency conversion at the anapole mode

Gili¹,

Ghirardini²,

Rocco³

et al. 2018

Beilstein J. Nanotechnol.

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Background: Dielectric nanoantennas have recently emerged as an alternative solution to plasmonics for nonlinear light manipulation at the nanoscale, thanks to the magnetic and electric resonances, the strong nonlinearities, and the low ohmic losses characterizing high refractive-index materials in the visible/near-infrared (NIR) region of the spectrum. In this frame, AlGaAs nanoantennas demonstrated to be extremely efficient sources of second harmonic radiation. In particular, the nonlinear polarization of an optical system pumped at the anapole mode can be potentially boosted, due to both the strong dip in the scattering spectrum and the near-field enhancement, which are characteristic of this mode. Plasmonic nanostructures, on the other hand, remain the most promising solution to achieve strong local field confinement, especially in the NIR, where metals such as gold display relatively low losses. Results: We present a nonlinear hybrid antenna based on an AlGaAs nanopillar surrounded by a gold ring, which merges in a single platform the strong field confinement typically produced by plasmonic antennas with the high nonlinearity and low loss characteristics of dielectric nanoantennas. This platform allows enhancing the coupling of light to the nanopillar at coincidence with the anapole mode, hence boosting both second- and third-harmonic generation conversion efficiencies. More than one order of magnitude enhancement factors are measured for both processes with respect to the isolated structure. Conclusion: The present results reveal the possibility to achieve tuneable metamixers and higher resolution in nonlinear sensing and spectroscopy, by means of improved both pump coupling and emission efficiency due to the excitation of the anapole mode enhanced by the plasmonic nanoantenna.

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“…In the last several years high-index dielectric nanoparticles and nanostructures [1][2][3] proved to be a promising platform for various nanophotonic applications, in particular for the design of functional nanoantennas [4][5][6], enhanced spontaneous emission [7][8][9][10], photovoltaics [11], frequency conversion [12][13][14], Raman scattering [15], and sensing [16]. The great interest in such nanostructures is caused mainly by their ability to control the electric and magnetic components of light at the nanoscale [1], while exhibiting low dissipative losses inherent to the materials with a negligible concentration of free charges [16].…”

Section: Introductionmentioning

confidence: 99%

All-Optical Switching and Unidirectional Plasmon Launching with Nonlinear Dielectric Nanoantennas

Krasnok

Lepeshov

et al. 2018

Phys. Rev. Applied

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High-index dielectric nanoparticles have become a powerful platform for modern light science, enabling various fascinating applications, especially in nonlinear nanophotonics for which they enable special types of optical nonlinearity, such as electron-hole plasma photoexcitation, which are not inherent to plasmonic nanostructures. Here, we propose a novel geometry for highly tunable alldielectric nanoantennas, consisting of a chain of silicon nanoparticles excited by an electric dipole source, which allows tuning their radiation properties via electron-hole plasma photoexcitation. We show that the slowly guided modes determining the Van Hove singularity of the nanoantenna are very sensitive to the nanoparticle permittivity, opening up the ability to utilize this effect for efficient all-optical modulation. We show that by pumping several boundary nanoparticles with relatively low intensities may cause dramatic variations in the nanoantenna radiation power patterns and Purcell factor. We also demonstrate that ultrafast pumping of the designed nanoantenna allows unidirectional launching of surface plasmon-polaritons, with interesting implications for modern nonlinear nanophotonics.

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Enhanced second-harmonic generation from magnetic resonance in AlGaAs nanoantennas

Cited by 215 publications

References 26 publications

Enhanced second-harmonic generation driven from magnetic dipole resonance in AlGaAs nanoantennas

Enhanced second-harmonic generation driven from magnetic dipole resonance in AlGaAs nanoantennas

Metal–dielectric hybrid nanoantennas for efficient frequency conversion at the anapole mode

All-Optical Switching and Unidirectional Plasmon Launching with Nonlinear Dielectric Nanoantennas

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