Monolithic AlGaAs second-harmonic nanoantennas

Gili, Valerio F.; Carletti, Luca; Locatelli, Andrea; Rocco, Davide; Finazzi, Marco; Ghirardini, Lavinia; Favero, Iván; Gómez, Carmen; Lemaı̂tre, A.; Celebrano, Michele; Angelis, C. De; Leo, Giuseppe

doi:10.1364/oe.24.015965

Cited by 233 publications

(258 citation statements)

References 25 publications

(31 reference statements)

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“…This corresponds to 1.5 × 10 5 enhancement of the THG signal relative to that from an unstructured Si film with the same thickness. Recent demonstrations also include enhancement of SHG in resonant nanopillars made of the high-index noncentrosymmetric III-V semiconductors GaAs (60) and AlGaAs (61). An enhancement factor of 10 4 relative to unstructured GaAs films is shown with total conversion efficiency of 2 × 10 −5 at a pump intensity of 3.4 GW/cm 2 .…”

Section: Nonlinear Optics With Resonant Dielectric Nanostructuresmentioning

confidence: 99%

Optically resonant dielectric nanostructures

Кузнецов

Miroshnichenko

Brongersma

et al. 2016

Science

2,391

2,012

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A clear approach to nanophotonics The resonant modes of plasmonic nanoparticle structures made of gold or silver endow them with an ability to manipulate light at the nanoscale. However, owing to the high light losses caused by metals at optical wavelengths, only a small fraction of plasmonics applications have been realized. Kuznetsov et al. review how high-index dielectric nanoparticles can offer a substitute for these metals, providing a highly flexible and low-loss route to the manipulation of light at the nanoscale. Science , this issue p. 10.1126/science.aag2472

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Section: Nonlinear Optics With Resonant Dielectric Nanostructuresmentioning

confidence: 99%

Optically resonant dielectric nanostructures

Кузнецов

Miroshnichenko

Brongersma

et al. 2016

Science

2,391

2,012

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“…We find that the SHG yield at the anapole mode in these hybrid platforms is almost two orders of magnitude higher than in isolated nanopillars. We also find sizeable THG with an emission yield comparable to that of SHG, which is unexpected since third-order nonlinear processes are commonly negligible in these systems [28,38]. The polarization-dependent optical properties of this platform together with the SHG angular emission characteristics indicate an improvement in both pump coupling and emission efficiency.…”

Section: Introductionmentioning

confidence: 59%

“…In this experiment we fully characterized the nonlinear emission from individual nanostructures, by using the nonlinear confocal setup described in the Experimental section (see also [28,33,38]). In brief, each individual nanoantenna is addressed with ultrashort pump pulses (140 fs) centered at 1554 nm and focused down to the diffraction limit by a 0.85 NA objective.…”

Section: Resultsmentioning

confidence: 99%

“…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]. The conversion efficiencies reported were higher than 10 −5 , which is more than four orders of magnitude higher than in optimized plasmonic nanoantennas pumped at similar intensities [12].…”

Section: Introductionmentioning

confidence: 99%

“…This allowed them to achieve a THG efficiency enhancement up to three orders of magnitude with respect to the bare disk [37]. In this work, we apply the same approach to obtain SHG enhancement in AlGaAs nanostructures [27–28 33] and investigate the properties of the emitted nonlinear optical signal. We find that the SHG yield at the anapole mode in these hybrid platforms is almost two orders of magnitude higher than in isolated nanopillars.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Tailorable Dynamics in Nonlinear Optical Metasurfaces

Ren

Cai

2019

Advanced Materials

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Controlling light with light is essential for all‐optical switching, data processing in optical communications and computing. Until now, all‐optical control of light has relied almost exclusively on nonlinear optical interactions in materials. Achieving giant nonlinearities under low light intensity is essential for weak‐light nonlinear optics. In the past decades, such weak‐light nonlinear phenomena have been demonstrated in photorefractive and photochromic materials. However, their bulky size and slow speed have hindered practical applications. Metasurfaces, which enhance light–matter interactions at the nanoscale, provide a new framework with tailorable nonlinearities for weak‐light nonlinear dynamics. Current advances in nonlinear metasurfaces are introduced, with a special emphasis on all‐optical light controls. The tuning of the nonlinearity values using metasurfaces, including enhancement and sign reversal is presented. The tailoring of the transient behaviors of nonlinearities in metasurfaces to achieve femtosecond switching speed is also discussed. Furthermore, the impact of quantum effects from the metasurface on the nonlinearities is introduced. Finally, an outlook on the future development of this energetic field is offered.

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Monolithic AlGaAs second-harmonic nanoantennas

Cited by 233 publications

References 25 publications

Optically resonant dielectric nanostructures

Optically resonant dielectric nanostructures

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

Tailorable Dynamics in Nonlinear Optical Metasurfaces

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