Polarization Engineered Second Harmonic Generation Enhancement from Amorphous Silicon - Gallium Nitride Heterogeneous Resonant Metasurface

Menon, Sruti; Raghunathan, Varun

doi:10.1109/jstqe.2022.3187083

Cited by 2 publications

(2 citation statements)

References 33 publications

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“…III-V materials have strong nonlinear coefficients, but signals can be screened by the substrate required for epitaxial growth or the second-order nonlinear optical susceptibility tensor is oriented unfavorably for out-of-plane excitation. [5,6] Poled polymers show an impressive modulation efficiency with an order of magnitude larger electro-optic coefficient compared to lithium niobate, but the material stability is hindering its use in long-term applications. [7,8] Plasmonic structures permit the highest electric field confinement but they are subject to high optical losses and low damage threshold.…”

Section: Introductionmentioning

confidence: 99%

Sol–Gel Barium Titanate Nanohole Array as a Nonlinear Metasurface and a Photonic Crystal

Talts,

Weigand,

Saerens

et al. 2023

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The quest of a nonlinear optical material that can be easily nanostructured over a large surface area is still ongoing. Here, we demonstrate a nanoimprinted nonlinear barium titanate 2D nanohole array that shows the optical properties of a 2D photonic crystal and a metasurface, depending on the direction of the optical axis. The challenge of nanostructuring the inert metal‐oxide is resolved by direct soft nanoimprint lithography with sol–gel derived barium titanate enabling critical dimensions of 120 nm with aspect ratios of five. The nanohole array exhibits a photonic bandgap in the infrared range when probed along the slab axis, while lattice resonant states are observed in out‐of‐plane transmission configuration. The enhanced light‐matter interaction from the resonant structure enables to increase in the second‐harmonic generation in the near‐ultraviolet by a factor of 18 illustrating the potential in the flexible fabrication technique for barium titanate photonic devices.

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Section: Introductionmentioning

confidence: 99%

Sol–Gel Barium Titanate Nanohole Array as a Nonlinear Metasurface and a Photonic Crystal

Talts,

Weigand,

Saerens

et al. 2023

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“…In general, the scatterers are designed as high contrast pillars made of meta-atoms with a large refractive index and low extinction coefficient depending on the specific spectral range. Titanium oxide (TiO 2 ) [ 21 ], gallium nitride (GaN) [ 22 ], silicon nitride (SiN) [ 23 ], hydrogenated amorphous silicon (a-Si:H) [ 24 ], and SiO 2 [ 25 ], among others, are widely used material candidates for the visible spectral range, while a-Si, gallium arsenide (GaAs) [ 26 ], gallium nitride (GaN) [ 27 ] aluminium nitride (AlN) [ 5 ], and litium niobate (LiNbO 3 ) [ 28 ] are the most commonly used for near-infrared applications.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Tunable Metasurfaces and Their Application in Optics

Santonocito,

Patrizi,

Toci

2023

Nanomaterials

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Metasurfaces can be opportunely and specifically designed to manipulate electromagnetic wavefronts. In recent years, a large variety of metasurface-based optical devices such as planar lenses, beam deflectors, polarization converters, and so on have been designed and fabricated. Of particular interest are tunable metasurfaces, which allow the modulation of the optical response of a metasurface; for instance, the variation in the focal length of a converging metalens. Response tunability can be achieved through external sources that modify the permittivity of the materials constituting the nanoatoms, the substrate, or both. The modulation sources can be classified into electromagnetic fields, thermal sources, mechanical stressors, and electrical bias. Beside this, we will consider optical modulation and multiple approach tuning strategies. A great variety of tunable materials have been used in metasurface engineering, such as transparent conductive oxides, ferroelectrics, phase change materials, liquid crystals, and semiconductors. The possibility of tuning the optical properties of these metamaterials is very important for several applications spanning from basic optics to applied optics for communications, depth sensing, holographic displays, and biochemical sensors. In this review, we summarize the recent progress on electro-optical magnetic, mechanical, and thermal tuning of metasurfaces actually fabricated and experimentally tested in recent years. At the end of the review, a short section on possible future perspectives and applications is included.

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Polarization Engineered Second Harmonic Generation Enhancement from Amorphous Silicon - Gallium Nitride Heterogeneous Resonant Metasurface

Cited by 2 publications

References 33 publications

Sol–Gel Barium Titanate Nanohole Array as a Nonlinear Metasurface and a Photonic Crystal

Sol–Gel Barium Titanate Nanohole Array as a Nonlinear Metasurface and a Photonic Crystal

Recent Advances in Tunable Metasurfaces and Their Application in Optics

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