scholarly journals Radial and Angular Electron Ejection Patterns of Two-Electron Quantum Dots in THz Fields

Atoms ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 38
Author(s):  
Adam Prior ◽  
Henri Bachau ◽  
Lampros A. A. Nikolopoulos
Keyword(s):  
Quantum Dots ◽  
Distribution Patterns ◽  
Ab Initio Method ◽  
Two Photon ◽  
Ionization Mechanisms ◽  
Kinetic Energy Spectrum ◽  
Terahertz Pulses ◽  
Electron Distributions ◽  
Electron Quantum ◽  
Electron Ejection

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.

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

2018 ◽  
Vol 122 (6) ◽  
pp. 1574-1583 ◽  
Author(s):  
Henri Bachau ◽  
Lampros A. A. Nikolopoulos
Keyword(s):  
Quantum Dots ◽  
Double Ionization ◽  
Two Photon ◽  
Electron Quantum

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

Nanomaterials ◽  
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.

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

Nanophotonics ◽  
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.

Temporal behavior of biexciton luminescence under two-photon excitation in CuCl quantum dots

2006 ◽  
Vol 119-120 ◽  
pp. 33-37 ◽  
Author(s):  
Y. Kagotani ◽  
K. Miyajima ◽  
S. Saito ◽  
M. Ashida ◽  
T. Itoh
Keyword(s):  
Quantum Dots ◽  
Temporal Behavior ◽  
Two Photon ◽  
Photon Excitation ◽  
Two Photon Excitation

Brightening and Control of Quenched Quantum Dots with Strong Terahertz Pulses

2021 ◽  
Author(s):  
Frank Y. Gao ◽  
J. Shi ◽  
Z. Zhang ◽  
H. Utzat ◽  
U. Barotov ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Terahertz Pulses ◽  
And Control

Two-Photon Fluorescence and MR Bio-imaging of Endogenous H2O2 in Tumor Microenvironment by a Dual-Mode Nanoprobe

2021 ◽  
Author(s):  
Hongmei Zhong ◽  
Shengrong Yu ◽  
Bingqian Li ◽  
Kangdi He ◽  
Dian Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Tumor Microenvironment ◽  
Mr Imaging ◽  
High Selectivity ◽  
Carbon Quantum Dots ◽  
Dual Mode ◽  
Two Photon ◽  
Bio Imaging ◽  
Two Photon Fluorescence ◽  
Photon Fluorescence

Dual-mode bio-imaging nanoprobe TP-CQDs@MnO2, based two-photon carbon quantum dots and MnO2, has been developed for two-photon fluorescence and MR imaging of endogenous H2O2 in tumor microenvironment, which achieved high selectivity,...

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