Direct and Sequential Two-Photon Double Ionization of Two-Electron Quantum Dots

In this work, we develop and apply an ab-initio method to calculate the joint radial- and- angular electron distributions following the interaction of two-electron spherical quantum dots (QD) with intense terahertz pulses of subpicosecond duration. By applying the method to two QDs of different size, we could investigate two particular ionization mechanisms: the direct and the sequential two-photon double ionization. According to our results, the two ionization mechanisms show some similarity in the angular distribution patterns, whereas the corresponding radial distributions are distinctly different, associated with their joint kinetic energy spectrum. We also discuss the time-evolution of the ionization process in the context of the different nature of the interaction of the QD with the external radiation and the electron–electron correlation interactions.

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Giant Two-photon Absorption in Circular Graphene Quantum Dots in Infrared Region

Scientific Reports ◽

10.1038/srep33260 ◽

2016 ◽

Vol 6 (1) ◽

Cited By ~ 8

Author(s):

Xiaobo Feng ◽

Zhisong Li ◽

Xin Li ◽

Yingkai Liu

Keyword(s):

Quantum Dots ◽

Graphene Quantum Dots ◽

Infrared Region ◽

Photon Absorption ◽

Two Photon Absorption ◽

Two Photon

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Wafer-Scale Epitaxial Low Density InAs/GaAs Quantum Dot for Single Photon Emitter in Three-Inch Substrate

Nanomaterials ◽

10.3390/nano11040930 ◽

2021 ◽

Vol 11 (4) ◽

pp. 930

Author(s):

Xiaoying Huang ◽

Rongbin Su ◽

Jiawei Yang ◽

Mujie Rao ◽

Jin Liu ◽

...

Keyword(s):

Quantum Dots ◽

Single Photon ◽

Growth Parameters ◽

Life Time ◽

Correlation Factor ◽

Low Density ◽

Wafer Scale ◽

Two Photon ◽

Gaas Quantum Dot ◽

Highly Uniform

In this work, we successfully achieved wafer-scale low density InAs/GaAs quantum dots (QDs) for single photon emitter on three-inch wafer by precisely controlling the growth parameters. The highly uniform InAs/GaAs QDs show low density of μ0.96/μm2 within the radius of 2 cm. When embedding into a circular Bragg grating cavity on highly efficient broadband reflector (CBR-HBR), the single QDs show excellent optoelectronic properties with the linewidth of 3± 0.08 GHz, the second-order correlation factor g2(τ)=0.0322 ±0.0023, and an exciton life time of 323 ps under two-photon resonant excitation.

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Enhanced two-photon photoluminescence assisted by multi-resonant characteristics of a gold nanocylinder

Nanophotonics ◽

10.1515/nanoph-2020-0213 ◽

2020 ◽

Vol 9 (12) ◽

pp. 4009-4019

Author(s):

Artur Movsesyan ◽

Gwénaëlle Lamri ◽

Sergei Kostcheev ◽

Anke Horneber ◽

Annika Bräuer ◽

...

Keyword(s):

Quantum Dots ◽

Enhancement Factor ◽

Second Harmonic ◽

Plasmon Mode ◽

Excitation Wavelength ◽

Resonant System ◽

Two Photon ◽

Plasmon Resonances ◽

Resonant Systems ◽

Photoluminescence Enhancement

AbstractMulti-resonant plasmonic simple geometries like nanocylinders and nanorods are highly interesting for two-photon photoluminescence and second harmonic generation applications, due to their easy fabrication and reproducibility in comparison with complex multi-resonant systems like dimers or nanoclusters. We demonstrate experimentally that by using a simple gold nanocylinder we can achieve a double resonantly enhanced two-photon photoluminescence of quantum dots, by matching the excitation wavelength of the quantum dots with a dipolar plasmon mode, while the emission is coupled with a radiative quadrupolar mode. We establish a method to separate experimentally the enhancement factor at the excitation and at the emission wavelengths for this double resonant system. The sensitivity of the spectral positions of the dipolar and quadrupolar plasmon resonances to the ellipticity of the nanocylinders and its impact on the two-photon photoluminescence enhancement are discussed.

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