scholarly journals Second-harmonic generation enhancement in high-contrast micropillar AlGaAs resonator in bound states in the continuum regime

2021 ◽  
Vol 2015 (1) ◽  
pp. 012067
Author(s):  
Stanislav Kolodny ◽  
Valerii Kozin ◽  
Ivan Iorsh
Keyword(s):  
Numerical Modelling ◽  
Bound States ◽  
Second Harmonic ◽  
Local Fields ◽  
High Contrast ◽  
Specific Design ◽  
Resonant Enhancement ◽  
Shg Efficiency ◽  
Mode Volume ◽  
The Continuum

Abstract It has been shown that the use of micropillar resonators, which comprise a cylindrical semiconductor cavity sandwiched between the Bragg mirrors can substantially increase the quality factor preserving the mode volume, and thus substantially enhance the local fields. Here, we show that these structures indeed can facilitate the significant enhancement of the SHG efficiency. We provide a specific design of the AlGaAs pillar microcavity and use the numerical modelling to directly show the resonant enhancement of the SHG efficiency. We believe that the presented results would be of high interest to the nanophotonic community, especially in nonlinear optics field.

scholarly journals Significantly enhanced second-harmonic generations with all-dielectric antenna array working in the quasi-bound states in the continuum and excited by linearly polarized plane waves

Nanophotonics ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Zhanghua Han ◽  
Fei Ding ◽  
Yangjian Cai ◽  
Uriel Levy
Keyword(s):  
Second Harmonic Generation ◽  
Magnetic Dipole ◽  
Harmonic Generation ◽  
Bound States ◽  
Second Harmonic ◽  
Generation Efficiency ◽  
Second Harmonic Generation Efficiency ◽  
Linearly Polarized ◽  
Magnetic Dipole Resonances ◽  
The Continuum

AbstractThe recently emerging all-dielectric optical nanoantennas based on high-index semiconductors have proven to be an effective and low-loss alternative to metal-based plasmonic structures for light control and manipulations of light–matter interactions. Nonlinear optical effects have been widely investigated to employ the enhanced interactions between incident light and the dielectrics at the Mie-type resonances, and in particular magnetic dipole resonances, which are supported by the semiconductor. In this paper, we explore the novel phenomenon of bound states in the continuum supported by high-index semiconductor nanostructures. By carefully designing an array of nanodisk structures with an inner air slot as the defect, we show that a novel high quality-factor resonance achieved based on the concept of bound state in the continuum can be easily excited by the simplest linearly polarized plane wave at normal incidence. This resonance further enhances the interactions between light and semiconductors and boosts the nonlinear effects. Using AlGaAs as the nonlinear material, we demonstrate a significant increase in the second-harmonic generation efficiency, up to six orders of magnitude higher than that achieved by magnetic dipole resonances. In particular, a second-harmonic generation efficiency around 10% can be numerically achieved at a moderate incident pump intensity of 5 MW/cm2.

scholarly journals Continuous Wave Second Harmonic Generation Enabled by Quasi-Bound-States in the Continuum on Gallium Phosphide Metasurfaces

Nano Letters ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 8745-8751
Author(s):  
Aravind P. Anthur ◽  
Haizhong Zhang ◽  
Ramon Paniagua-Dominguez ◽  
Dmitry A. Kalashnikov ◽  
Son Tung Ha ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Bound States ◽  
Gallium Phosphide ◽  
Continuous Wave ◽  
Second Harmonic ◽  
The Continuum

Observation of highly efficient second-harmonic generation at the nanoscale driven by bound states in the continuum

2020 ◽  
Author(s):  
Kirill L. Koshelev ◽  
Sergey Kruk ◽  
Elizaveta Melik-Gaykazyan ◽  
Jae-Hyuck Choi ◽  
Andrey Bogdanov ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Bound States ◽  
Second Harmonic ◽  
Highly Efficient ◽  
The Continuum

scholarly journals Quasi-BIC laser enabled by high-contrast grating resonator for gas detection

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Haoran Zhang ◽  
Tao Wang ◽  
Jingyi Tian ◽  
Jiacheng Sun ◽  
Shaoxian Li ◽  
...  
Keyword(s):  
Bound States ◽  
Signal To Noise Ratio ◽  
Bound State ◽  
Gain Medium ◽  
Gas Detection ◽  
Visible Range ◽  
High Signal ◽  
High Contrast ◽  
High Contrast Grating ◽  
The Continuum

Abstract In this work, we propose and numerically investigate a two-dimensional microlaser based on the concept of bound states in the continuum (BIC). The device consists of a thin gain layer (Rhodamine 6G dye-doped silica) sandwiched between two high-contrast-grating layers. The structure supports various BIC modes upon a proper choice of topological parameters; in particular it supports a high-Q quasi-BIC mode when partially breaking a bound state in the continuum at Γ point. The optically-pumped gain medium provides sufficient optical gain to compensate the quasi-BIC mode losses, enabling lasing with ultra-low pump threshold (fluence of 17 μJ/cm2) and very narrow optical linewidth in the visible range. This innovative device displays distinguished sensing performance for gas detection, and the emission wavelength sensitively shifts to the longer wavelength with the changing of environment refractive index (in order of 5 × 10−4). The achieved bulk sensitivity is 221 nm/RIU with a high signal to noise ratio, and a record-high figure of merit reaches to 4420 RIU−1. This ultracompact and low threshold quasi-BIC laser facilitated by the ultra-narrow resonance can serve as formidable candidate for on-chip gas sensor.

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