scholarly journals Неклассические источники света на основе селективно позиционированных микролинзовых структур и (111) In(Ga)As квантовых точек

2019 ◽  
Vol 53 (10) ◽  
pp. 1338
Author(s):  
И.А. Деребезов ◽  
В.А. Гайслер ◽  
А.В. Гайслер ◽  
Д.В. Дмитриев ◽  
А.И. Торопов ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Single Photon ◽  
Photon Emission ◽  
Bragg Reflector ◽  
Entangled Photons ◽  
Single Photon Emission ◽  
Distributed Bragg Reflector ◽  
Natural Width ◽  
Single Quantum Dot

Hybrid microcavity for single quantum dot based emitters has been developed and realized. The microcavity consists of semiconductor distributed Bragg reflector and microlens, which is selectively positioned over a single (111) In(Ga)As quantum dot. We have demonstrated pure single photon emission with g(2)(0) = 0.07. The fine structure of exciton states of (111) In(Ga)As quantum dots is studied. It is shown that the splitting of exciton states is comparable with the natural width of exciton lines, which is of great interest for the design of emitters of pairs of entangled photons on the basis of these quantum dots.

Electrically driven single photon emission from a CdSe/ZnSSe single quantum dot at 200 K

2014 ◽  
Vol 105 (9) ◽  
pp. 091102 ◽  
Author(s):  
Wolf Quitsch ◽  
Tilmar Kümmell ◽  
Arne Gust ◽  
Carsten Kruse ◽  
Detlef Hommel ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Single Photon ◽  
Photon Emission ◽  
Single Quantum ◽  
Single Photon Emission ◽  
Single Quantum Dot

scholarly journals Electrical control of single-photon emission in highly charged individual colloidal quantum dots

2020 ◽  
Vol 6 (38) ◽  
pp. eabb1821
Author(s):  
Sergii Morozov ◽  
Evangelina L. Pensa ◽  
Ali Hossain Khan ◽  
Anatolii Polovitsyn ◽  
Emiliano Cortés ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Decay Rate ◽  
Room Temperature ◽  
Single Photon ◽  
Photon Emission ◽  
Fold Increase ◽  
Single Photon Emission ◽  
Time Resolved ◽  
Efficient Lasing

Electron transfer to an individual quantum dot promotes the formation of charged excitons with enhanced recombination pathways and reduced lifetimes. Excitons with only one or two extra charges have been observed and exploited for very efficient lasing or single–quantum dot light-emitting diodes. Here, by room-temperature time-resolved experiments on individual giant-shell CdSe/CdS quantum dots, we show the electrochemical formation of highly charged excitons containing more than 12 electrons and 1 hole. We report the control over intensity blinking, along with a deterministic manipulation of quantum dot photodynamics, with an observed 210-fold increase in the decay rate, accompanied by 12-fold decrease in the emission intensity, while preserving single-photon emission characteristics. These results pave the way for deterministic control over the charge state, and room-temperature decay rate engineering for colloidal quantum dot–based classical and quantum communication technologies.

scholarly journals Wet-Etched Microlens Array for 200 nm Spatial Isolation of Epitaxial Single QDs and 80 nm Broadband Enhancement of Their Quantum Light Extraction

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1136
Author(s):  
Shulun Li ◽  
Xiangjun Shang ◽  
Yao Chen ◽  
Xiangbin Su ◽  
Huiming Hao ◽  
...  
Keyword(s):  
Single Photon ◽  
Photon Emission ◽  
Microlens Array ◽  
Bragg Reflector ◽  
Light Extraction ◽  
Single Photon Emission ◽  
Distributed Bragg Reflector ◽  
Purcell Factor ◽  
Time Correlations ◽  
Spatial Isolation

Uniform arrays of three shapes (gauss, hat, and peak) of GaAs microlenses (MLs) by wet-etching are demonstrated, ∼200 nm spatial isolation of epitaxial single QDs embedded (λ: 890–990 nm) and broadband (Δλ∼80 nm) enhancement of their quantum light extraction are obtained, which is also suitable for telecom-band epitaxial QDs. Combined with the bottom distributed Bragg reflector, the hat-shaped ML forms a cavity and achieves the best enhancement: extraction efficiency of 26%, Purcell factor of 2 and single-photon count rate of 7×106 counts per second at the first lens; while the gauss-shaped ML shows a broader band (e.g., longer λ) enhancement. In the MLs, single QDs with featured exciton emissions are observed, whose time correlations prove single-photon emission with multi-photon probability g(2)(0)=0.02; some QDs show both biexciton XX and exciton X emissions and exhibit a perfect cascade feature. This work could pave a step towards a scalable array of QD single-photon sources and the application of QD photon-pair emission for entanglement experiments.

scholarly journals Pure single-photon emission from an InGaN/GaN quantum dot

APL Materials ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 061106
Author(s):  
M. J. Holmes ◽  
T. Zhu ◽  
F. C.-P. Massabuau ◽  
J. Jarman ◽  
R. A. Oliver ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Single Photon ◽  
Photon Emission ◽  
Single Photon Emission

Single photon emission from top-down etched III-nitride quantum dots

2020 ◽  
Vol 31 (13) ◽  
pp. 13LT01 ◽  
Author(s):  
Yaonan Hou ◽  
Yong Wang ◽  
Qingkang Ai
Keyword(s):  
Quantum Dots ◽  
Single Photon ◽  
Photon Emission ◽  
Single Photon Emission ◽  
Top Down

scholarly journals Single-photon emission from InAsP quantum dots embedded in density-controlled InP nanowires

2017 ◽  
Vol 56 (4S) ◽  
pp. 04CP04 ◽  
Author(s):  
Shougo Yanase ◽  
Hirotaka Sasakura ◽  
Shinjiro Hara ◽  
Junichi Motohisa
Keyword(s):  
Quantum Dots ◽  
Single Photon ◽  
Photon Emission ◽  
Single Photon Emission
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