Nonlinear Generation of Vector Beams From AlGaAs Nanoantennas

Camacho‐Morales, Rocio; Rahmani, Mohsen; Kruk, Sergey; Wang, Lei; Xu, Lei; Smirnova, Daria; Solntsev, Alexander S.; Miroshnichenko, Andrey E.; Tan, Hark Hoe; Karouta, F.; Naureen, Shagufta; Vora, Kaushal; Carletti, Luca; Angelis, C. De; Jagadish, Chennupati; Kivshar, Yuri S.; Neshev, Dragomir N.

doi:10.1021/acs.nanolett.6b03525

Cited by 277 publications

(272 citation statements)

References 43 publications

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“…Furthermore, semiconductors provide the possibility of modulating the refractive index via the injection of free carriers (FCs); this effect is quite subtle in metals due to the very high initial electron density. Nonlinear-optical properties of semiconductor metasurfaces were recently found to be improved by orders of magnitude when compared with the respective constituent materials 21–26 , paving the way to efficient all-optical tuning.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast all-optical tuning of direct-gap semiconductor metasurfaces

et al. 2017

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Optical metasurfaces are regular quasi-planar nanopatterns that can apply diverse spatial and spectral transformations to light waves. However, metasurfaces are no longer adjustable after fabrication, and a critical challenge is to realise a technique of tuning their optical properties that is both fast and efficient. We experimentally realise an ultrafast tunable metasurface consisting of subwavelength gallium arsenide nanoparticles supporting Mie-type resonances in the near infrared. Using transient reflectance spectroscopy, we demonstrate a picosecond-scale absolute reflectance modulation of up to 0.35 at the magnetic dipole resonance of the metasurfaces and a spectral shift of the resonance by 30 nm, both achieved at unprecedentedly low pump fluences of less than 400 μJ cm–2. Our findings thereby enable a versatile tool for ultrafast and efficient control of light using light.

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Section: Introductionmentioning

confidence: 99%

Ultrafast all-optical tuning of direct-gap semiconductor metasurfaces

et al. 2017

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“…[47,48] In this work, we first analyzed a unit cell of VSRR and found that under x-polarized illumination it induces two SH surface current distributions that generate two categories of SH signals propagating in six different directions, as shown in Figure 4a. The determination of phase modulation by an individual unit cell involves substantial computation and analysis.…”

Section: Stereometamaterialsmentioning

confidence: 99%

Second Harmonic Light Manipulation with Vertical Split Ring Resonators

et al. 2018

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inducing electromagnetic fields. [9,10] In general, SHG conversion efficiency relies on several factors: inversion asymmetry of the hosting media, spatial overlap of the fundamental and second-harmonic (SH) modes, quality factor (Q-factor) of the involved modes, and the field intensity of the fundamental resonant mode. [11][12][13][14][15][16] Among these factors, plasmonic nanostructures [17][18][19][20][21][22][23] have a clear advantage of being particularly effective in inducing strong electromagnetic field that can increase the SHG conversion efficiency. For instance, the large field confinement associated with the magnetic resonances of split-ring resonators (SRRs) has led to a significant SHG enhancement. [23][24][25][26][27][28] While these prior results have been a major step forward in demonstrating SHG in plasmonic structures, further improvement is needed if they were to become a competitive alternative. Take SRR metasurface as an example, most of fabricated SRRs are of planar subwavelength structures, in which they lay flat on a high index dielectric substrate as illustrated in the inset of Figure 1a. While such planar SRRs (PSRRs) are relatively easy to fabricate, the strong fields present in PSRR gaps are inevitably exposed to the underlying substrate, resulting in leakage of the electromagnetic energy into the substrate, reducing the exposure of enhancedThe second harmonic generation (SHG) of vertical and planar split-ring resonators (SRRs) that are broken centro-symmetry configurations at the interface of metal surface and air is investigated. Strong interactions, better electromagnetic field confinements, and less leakage into the substrate for vertical SRRs are found. Experimental results show a 2.6-fold enhancement of SHG nonlinearity, which is in good agreement with simulations and calculations. Demonstrations of 3D metastructures and vertical SRRs with strong SHG nonlinearity majorly result from magnetic dipole and electric quadrupole clearly provides potential applications for photonics and sensing. StereometamaterialsSince its discovery soon after the invention of the laser, the second harmonic generation (SHG) as a prominent nonlinear optical effect has played an important role in various photonic applications ranging from light source, [1] high-resolution imaging, to spectroscopy. [2][3][4] Fundamentally, SHG is prohibited in bulk noble metals such as gold and silver occasionally used in metamaterials because of their centrosymmetric crystal lattices. Recently, the phenomenon of SHG has been widely studied in various metallic nanostructures, such as nanorods, nanoparticles, multiresonant, nanoantennas, etc. [5][6][7][8] In plasmonic systems, nonlinearity was mainly attributed to either the broken centro-symmetry at the metal surface or to the high degree of the asymmetric spatial variation of the

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“…Recently it has been proposed that all-dielectric high-index nanostructures, for example, composed of Si, Ge, [1] Te, [2] or AlGaAs, [3] can be used as alternatives to plasmonic structures for realization of low-loss nanophotonic platforms more suitable for real-life practical applications. One of the main limitations is related to intrinsic resistive dissipation, which limits the quality factor of their resonances, causes absorption losses, and may lead to unwanted photothermal heating.…”

Section: Chiral Nanoresonatorsmentioning

confidence: 99%

“…A nanostructure possessing a gradient at the nanoscale is fabricated onto a high-quality silicon film previously deposited on a glass wafer. Recently it has been proposed that all-dielectric high-index nanostructures, for example, composed of Si, Ge, [1] Te, [2] or AlGaAs, [3] can be used as alternatives to plasmonic structures for realization of low-loss nanophotonic platforms more suitable for real-life practical applications. The particles can subsequently be detached from the substrate to produce a colloidal suspension by placing the sample into a solution that selectively etches the substrate.…”

mentioning

confidence: 99%

Metasurfaces and Colloidal Suspensions Composed of 3D Chiral Si Nanoresonators

et al. 2017

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High-refractive-index silicon nanoresonators are promising low-loss alternatives to plasmonic particles in CMOS-compatible nanophotonics applications. However, complex 3D particle morphologies are challenging to realize in practice, thus limiting the range of achievable optical functionalities. Using 3D film structuring and a novel gradient mask transfer technique, the first intrinsically chiral dielectric metasurface is fabricated in the form of a monolayer of twisted silicon nanocrescents that can be easily detached and dissolved into colloidal suspension. The metasurfaces exhibit selective handedness and a circular dichroism as large as 160° µm due to pronounced differences in induced current loops for left-handed and right-handed polarization. The detailed morphology of the detached particles is analyzed using high-resolution transmission electron microscopy. Furthermore, it is shown that the particles can be manipulated in solution using optical tweezers. The fabrication and detachment method can be extended to different nanoparticle geometries and paves the way for a wide range of novel nanophotonic experiments and applications of high-index dielectrics.

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Nonlinear Generation of Vector Beams From AlGaAs Nanoantennas

Cited by 277 publications

References 43 publications

Ultrafast all-optical tuning of direct-gap semiconductor metasurfaces

Ultrafast all-optical tuning of direct-gap semiconductor metasurfaces

Second Harmonic Light Manipulation with Vertical Split Ring Resonators

Metasurfaces and Colloidal Suspensions Composed of 3D Chiral Si Nanoresonators

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