Low-index dielectric metasurfaces supported by metallic substrates for efficient second-harmonic generation in the blue-ultraviolet range

2020 ◽  
Vol 22 (14) ◽  
pp. 7300-7305 ◽  
Author(s):  
Kwang-Hyon Kim
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
High Field ◽  
Second Harmonic ◽  
Field Enhancement ◽  
Metallic Surfaces ◽  
Metallic Substrates ◽  
Ultraviolet Range

High field enhancement in low-index dielectric metasurfaces on metallic surfaces enables efficient harmonic generation in the visible-ultraviolet range.

Enhancement of second harmonic generation using a novel asymmetric metal–graphene–insulator–metal plasmonic waveguide

2018 ◽  
Vol 27 (01) ◽  
pp. 1850003 ◽  
Author(s):  
Mohamadreza Soltani
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Field Enhancement ◽  
The Other ◽  
Nonlinear Susceptibility ◽  
Optical Process ◽  
Large Enhancement ◽  
Nonlinear Optical Process

Here, we propose a novel plasmonic structure, called asymmetric plasmonic nanocavity grating (APNCG), which is shown to dramatically enhance nonlinear optical process of second harmonic generation (SHG). The proposed structure consists of two different metals on both sides of lithium niobate and a thin layer of graphene. By using two different metals the nonlinear susceptibility of the waveguide would be increased noticeably causing to increase SHG. On the other hand, it consists of two identical gratings on one side. By two identical gratings, the pump beam is coupled to two opposing SPP waves, which interfere with each other and result in SPP standing wave in the region between the two gratings. The distance between two gratings will be optimized to reach the highest SHG. It will be shown that by optimizing the geometry of proposed structure and using different metals, field enhancement in APNCG waveguides can result in large enhancement of SHG.

scholarly journals Second Harmonic Generation from Phase-Engineered Metasurfaces of Nanoprisms

Micromachines ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 848 ◽  
Author(s):  
Kanta Mochizuki ◽  
Mako Sugiura ◽  
Hirofumi Yogo ◽  
Stefan Lundgaard ◽  
Jingwen Hu ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Field Enhancement ◽  
Normal Incidence ◽  
Electrical Field ◽  
Fundamental Wavelength ◽  
Reflectivity Spectra ◽  
Lift Off ◽  
Second Order Nonlinearity

Metasurfaces of gold (Au) nanoparticles on a SiO2-Si substrate were fabricated for the enhancement of second harmonic generation (SHG) using electron beam lithography and lift-off. Triangular Au nanoprisms which are non-centro-symmetric and support second-order nonlinearity were examined for SHG. The thickness of the SiO2 spacer is shown to be an effective parameter to tune for maximising SHG. Electrical field enhancement at the fundamental wavelength was shown to define the SHG intensity. Numerical modeling of light enhancement was verified by experimental measurements of SHG and reflectivity spectra at the normal incidence. At the plasmonic resonance, SHG is enhanced up to ∼3.5 × 103 times for the optimised conditions.

scholarly journals Enhancing second-harmonic generation with electron spill-out at metallic surfaces

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Muhammad Khalid ◽  
Cristian Ciracì
Keyword(s):  
Second Harmonic Generation ◽  
Metal Surface ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Thick Layer ◽  
Metallic Surfaces ◽  
Hydrodynamic Description ◽  
Second Harmonic Generation Efficiency ◽  
Quantum Hydrodynamic ◽  
Quantum Mechanical Effects

AbstractSecond-order nonlinear optical processes do not manifest in the bulk of centrosymmetric materials, but may occur in the angstroms-thick layer at surfaces. At such length scales, quantum mechanical effects come into play which could be crucial for an accurate description of plasmonic systems. In this article, we develop a theoretical model based on the quantum hydrodynamic description to study free-electron nonlinear dynamics in plasmonic systems. Our model predicts strong resonances induced by the spill-out of electron density at the metal surface. We show that these resonances can boost second-harmonic generation efficiency up to four orders of magnitude and can be arbitrarily tuned by controlling the electron spill-out at the metal surface with the aid of thin dielectric layers. These results offer a possibility to artificially increase nonlinear susceptibilities by engineering optical properties at the quantum level.

scholarly journals Strong modulation of second-harmonic generation with very large contrast in semiconducting CdS via high-field domain

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Ming-Liang Ren ◽  
Jacob S. Berger ◽  
Wenjing Liu ◽  
Gerui Liu ◽  
Ritesh Agarwal
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
High Field ◽  
Second Harmonic

scholarly journals Role of antenna modes and field enhancement in second harmonic generation from dipole nanoantennas

2015 ◽  
Vol 23 (2) ◽  
pp. 1715 ◽  
Author(s):  
Domenico de Ceglia ◽  
Maria Antonietta Vincenti ◽  
Costantino De Angelis ◽  
Andrea Locatelli ◽  
Joseph W. Haus ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Field Enhancement

scholarly journals Second Harmonic Generation From Phase-Engineered Metasurfaces of Nanoprisms

2020 ◽  
Author(s):  
Kannta Mochizuki ◽  
Mako Sugiura ◽  
Hirofumi Yogo ◽  
Stefan Lundgaard ◽  
Jingwen Hu ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Field Enhancement ◽  
Normal Incidence ◽  
Electrical Field ◽  
Fundamental Wavelength ◽  
Light Enhancement ◽  
Reflectivity Spectra ◽  
Lift Off

Metasurfaces of gold (Au) nanoparticles on a SiO2-Si substrate were fabricated for the enhancement of second harmonic generation (SHG) using electron beam lithography and lift-off. Triangular Au nanoprisms which are non-centro-symmetric and support the second- order non-linearity were examined for SHG. The thickness of the SiO2 spacer is shown to be an efficient parameter to spectrally tune to maximise SHG. Electrical field enhancement at the fundamental wavelength was shown to define the intensity of the second harmonics. Numerical modeling of light enhancement was verified by experimental measurements of SHG and reflectivity spectra at the normal incidence. At the plasmonic resonance, SHG is enhanced up to ∼3.5×103 times for the optimised conditions.

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