scholarly journals Metamorphic Buffer Layer Platform for 1550 nm Single-Photon Sources Grown by MBE on (100) GaAs Substrate

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5221
Author(s):  
Piotr Andrzej Wroński ◽  
Paweł Wyborski ◽  
Anna Musiał ◽  
Paweł Podemski ◽  
Grzegorz Sęk ◽  
...  
Keyword(s):  
Buffer Layer ◽  
Single Photon ◽  
Photon Emission ◽  
Bragg Reflector ◽  
Light Sources ◽  
Distributed Bragg Reflector ◽  
Time Resolved ◽  
Metamorphic Buffer ◽  
Silica Fibers ◽  
Emission Lifetime

We demonstrate single-photon emission with a low probability of multiphoton events of 5% in the C-band of telecommunication spectral range of standard silica fibers from molecular beam epitaxy grown (100)-GaAs-based structure with InAs quantum dots (QDs) on a metamorphic buffer layer. For this purpose, we propose and implement graded In content digitally alloyed InGaAs metamorphic buffer layer with maximal In content of 42% and GaAs/AlAs distributed Bragg reflector underneath to enhance the extraction efficiency of QD emission. The fundamental limit of the emission rate for the investigated structures is 0.5 GHz based on an emission lifetime of 1.95 ns determined from time-resolved photoluminescence. We prove the relevance of a proposed technology platform for the realization of non-classical light sources in the context of fiber-based quantum communication applications.

scholarly journals InP-Substrate-Based Quantum Dashes on a DBR as Single-Photon Emitters at the Third Telecommunication Window

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 759
Author(s):  
Paweł Wyborski ◽  
Anna Musiał ◽  
Paweł Mrowiński ◽  
Paweł Podemski ◽  
Vasilij Baumann ◽  
...  
Keyword(s):  
Single Photon ◽  
Photon Emission ◽  
Bragg Reflector ◽  
Spectral Lines ◽  
Distributed Bragg Reflector ◽  
The Third ◽  
Photonic Structures ◽  
Single Photon Emitters ◽  
Quantum Dashes ◽  
Telecommunication Window

We investigated emission properties of photonic structures with InAs/InGaAlAs/InP quantum dashes grown by molecular beam epitaxy on a distributed Bragg reflector. In high-spatial-resolution photoluminescence experiment, well-resolved sharp spectral lines are observed and single-photon emission is detected in the third telecommunication window characterized by very low multiphoton events probabilities. The photoluminescence spectra measured on simple photonic structures in the form of cylindrical mesas reveal significant intensity enhancement by a factor of 4 when compared to a planar sample. These results are supported by simulations of the electromagnetic field distribution, which show emission extraction efficiencies even above 18% for optimized designs. When combined with relatively simple and undemanding fabrication approach, it makes this kind of structures competitive with the existing solutions in that spectral range and prospective in the context of efficient and practical single-photon sources for fiber-based quantum networks applications.

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.

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 Optical Losses in Hybrid Microcavity Based in Porous Semiconductors and its Application as Optic Chemical Sensor

2019 ◽  
Vol 56 ◽  
pp. 158-167
Author(s):  
Claudia Antonio Hernández ◽  
Edith Osorio ◽  
Raúl Urteaga ◽  
Roberto Koropecki ◽  
José Alberto Alvarado ◽  
...  
Keyword(s):  
Chemical Sensor ◽  
Visible Region ◽  
Bragg Reflector ◽  
Resonant Peak ◽  
Light Sources ◽  
Optical Losses ◽  
Distributed Bragg Reflector ◽  
Nanoporous Anodic Alumina ◽  
Porous Semiconductors ◽  
Point Light

In this study the experimental and theoretical optical analysis of a hybrid microcavity (HM) based in porous silicon (PS) and nanoporous anodic alumina (NAA) are presented. The microcavity was centered in the visible region at 760 nm. Distributed Bragg reflector (DBR) was obtained using galvanostatic anodizing method and while NAA by the two-step anodization technique. From SEM micrographs the HM different regions are observed. HM optical characterization in the visible region was done, considering two different light sources, point and non-point respectively. These results reveal a decrease in the quality factor (Q) from 350 to 190 when the source is exchanged; this behavior has been mainly attributed to the light scattering at NAA. Furthermore, it was possible to study Q change, through transmittance simulation using the transfer matrix and Landau-Lifshitz-Looyenga theoretical methods. When a point light source is used, there are no optical losses making possible to sense 1% of analyte resulting in a 0.29 nm redshift of the resonant peak. According with these results we propose to apply the HM as chemical optic sensor.

scholarly journals Integration of Single-Photon Emitters in 2D Materials with Plasmonic Waveguides at Room Temperature

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1663
Author(s):  
Kwang-Yong Jeong ◽  
Seong Won Lee ◽  
Jae-Hyuck Choi ◽  
Jae-Pil So ◽  
Hong-Gyu Park
Keyword(s):  
Integrated Circuits ◽  
Room Temperature ◽  
Single Photon ◽  
Hexagonal Boron Nitride ◽  
Photon Emission ◽  
Plasmonic Waveguide ◽  
Practical Implementation ◽  
Plasmonic Waveguides ◽  
Time Resolved ◽  
Ag Nanowire

Efficient integration of a single-photon emitter with an optical waveguide is essential for quantum integrated circuits. In this study, we integrated a single-photon emitter in a hexagonal boron nitride (h-BN) flake with a Ag plasmonic waveguide and measured its optical properties at room temperature. First, we performed numerical simulations to calculate the efficiency of light coupling from the emitter to the Ag plasmonic waveguide, depending on the position and polarization of the emitter. In the experiment, we placed a Ag nanowire, which acted as the plasmonic waveguide, near the defect of the h-BN, which acted as the single-photon emitter. The position and direction of the nanowire were precisely controlled using a stamping method. Our time-resolved photoluminescence measurement showed that the single-photon emission from the h-BN flake was enhanced to almost twice the intensity as a result of the coupling with the Ag nanowire. We expect these results to pave the way for the practical implementation of on-chip nanoscale quantum plasmonic integrated circuits.

scholarly journals Electron Beam Pumping in Nitride Vertical Cavities with GaN/ Al0.25 Ga0.75 N Bragg Reflectors

2000 ◽  
Vol 5 (S1) ◽  
pp. 654-660 ◽  
Author(s):  
H. Klausing ◽  
J. Aderhold ◽  
F. Fedler ◽  
D. Mistele ◽  
J. Stemmer ◽  
...  
Keyword(s):  
Electron Beam ◽  
Uv Light ◽  
Active Regions ◽  
Bragg Reflector ◽  
Light Sources ◽  
Distributed Bragg Reflector ◽  
Surface Emitting Lasers ◽  
Projection Display ◽  
Display Technology ◽  
Emitting Lasers

Electron beam pumped surface emitting lasers are of great interest for a variety of applications, such as Laser Cathode Ray Tubes (LCRT) in projection display technology or high power UV light sources for photolithography.Two distributed Bragg reflector (DBR) samples were grown by plasma assisted molecular beam epitaxy (PAMBE). The active regions of the samples are a GaN:Si bulk layer and a multihetero (MH) structure, respectively.Also, a separately grown single DBR stack was studied to find optical transmission and reflection properties which were compared to transfer matrix simulations.

scholarly journals Narrow Linewidth Distributed Bragg Reflectors Based on InGaN/GaN Laser

Micromachines ◽  
2019 ◽  
Vol 10 (8) ◽  
pp. 529 ◽  
Author(s):  
Xie ◽  
Li ◽  
Liao ◽  
Deng ◽  
Wang ◽  
...  
Keyword(s):  
Gallium Nitride ◽  
Visible Light ◽  
Communication Systems ◽  
Fdtd Method ◽  
Visible Light Communication ◽  
Bragg Reflector ◽  
Duty Ratio ◽  
Light Sources ◽  
Distributed Bragg Reflector ◽  
Dbr Lasers

A variety of emerging technologies, such as visible light communication systems, require narrow linewidths and easy-to-integrate light sources. Such a requirement could be potentially fulfilled with the distributed Bragg reflector (DBR) lasers, which are also promising for the monolithical integration with other optical components. The InGaN/GaN-based surface etched DBR is designed and optimized using the finite-difference-time-domain (FDTD) method to obtain very narrow-band reflectors that can serve as a wavelength filter. The results reveal that the ultimate reflectivity depends on the grating period and duty ratio of the DBR. Based on the design, the DBR lasers with various duty ratios are fabricated, specifically, the 19th, 13th and 3rd order DBR grating with duty ratio set as 50%/75%/95%. The minimum linewidth could be achieved at 0.45 nm from the 19th order grating with a 75% duty ratio. For comparison, the Fabry–Pérot (F–P) based on the same indium gallium nitride/gallium nitride (InGaN/GaN) epitaxial wafer are fabricated. The full width at half maximum (FWHM) of the DBR laser shrank by 65% compared to that of the conventional F–P laser, which might be helpful in the application of the visible light communication system.

scholarly journals Superior properties in room-temperature colloidal-dot quantum emitters revealed by ultralow-dark-count detections of temporally-purified single photons

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Toshiyuki Ihara ◽  
Shigehito Miki ◽  
Toshiki Yamada ◽  
Takahiro Kaji ◽  
Akira Otomo ◽  
...  
Keyword(s):  
Room Temperature ◽  
Quantum Information Processing ◽  
Single Photon ◽  
Photon Emission ◽  
Light Sources ◽  
Single Photons ◽  
Dark Count ◽  
Photon Detectors ◽  
High Quality ◽  
Quantum Emitters

Abstract The realization of high-quality quantum emitters that can operate at room temperature is important for accelerating the application of quantum technologies, such as quantum communication, quantum information processing, and quantum metrology. In this work, we study the photon-antibunching properties on room-temperature emission from individual colloidal quantum dots (CQDs) using superconducting-nanowire single-photon detectors and temporal filtering of the photoluminescence decay curve. We find that high single-photon purities and high photon-generation rates can be simultaneously achieved by removing the signals originating from the sequential two-photon emission of biexcitons created by multiple excitation pulses. We successfully demonstrate that the ultrahigh performance of the room-temperature single-photon sources showing g(2)(0) ≪ 10−2 can be confirmed by the ultralow-dark-count detection of the temporally purified single photons. These findings provide strong evidence for the attractiveness of CQDs as candidates for high-quality room-temperature quantum light sources.

Next-Generation Optical Probing Tools for Design Debug of High Speed Integrated Circuits

2002 ◽  
Author(s):  
William Lo ◽  
Kenneth Wilsher ◽  
Richard Malinsky ◽  
Nina Boiadjieva ◽  
Chun-Cheng Tsao ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
High Speed ◽  
Detection Efficiency ◽  
Single Photon ◽  
Photon Emission ◽  
Next Generation ◽  
Large Area ◽  
Single Photon Detector ◽  
Time Resolved ◽  
Optical Probing

Abstract Time-resolved photon emission (TRPE) results, obtained using a new superconducting, single-photon detector (SSPD) are reported. Detection efficiency (DE) for large area detectors has recently been improved by >100x without affecting SSPDs inherently low jitter (≈30 ps) and low dark-count rate (<30 s-1). TRPE measurements taken from a 0.13 μm geometry CMOS IC are presented. A single laser, time-differential probing scheme that is being investigated for next-generation laser voltage probing (LVP) is also discussed. This new scheme is designed to have shot-noise-limited performance, allowing signals as small as 100 parts-per-million (ppm) to be reliably measured.

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