1
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Bucci G, Zannier V, Rossi F, Musiał A, Boniecki J, Sęk G, Sorba L. Zincblende InAs xP 1-x/InP Quantum Dot Nanowires for Telecom Wavelength Emission. ACS Appl Mater Interfaces 2024. [PMID: 38729621 DOI: 10.1021/acsami.4c00615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2024]
Abstract
InAsxP1-x quantum dots (QDs) in InP nanowires (NWs) have been realized as a platform for emission at telecom wavelengths. These QDs are typically grown in NWs with the wurtzite crystal phase, but in this case, ultrathin diameters are required to achieve defect-free heterostructures, making the structures less robust. In this work, we demonstrate the growth of pure zincblende InAsxP1-x QDs in InP NWs, which enabled an increase in NW diameters to about 45 nm, achieved by employing Au-assisted vapor liquid solid growth in a chemical beam epitaxy system. We studied the growth of InP/InAsxP1-x heterostructures with different compositions to control the straight growth along the ⟨100⟩ direction and to tune the emission wavelength. Interestingly, we found that the growth mechanism for pure InAs QDs is different compared to that for InAsxP1-x alloy QDs. This allowed us to optimize different growth protocols to achieve straight growth of the final QD NWs. We successfully obtained the growth of InAsxP1-x QDs with a composition in the range of x = 0.24-1.00. By means of microphotoluminescence measurements, we demonstrate the tunability of the emission in dependence of the InAsxP1-x QD composition and morphology, remarkably observing an emission at the telecom O-band for a 10 nm thick QD with 80% of As content.
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Affiliation(s)
- Giada Bucci
- NEST Istituto Nanoscienze Consiglio Nazionale delle Ricerche (CNR) and Scuola Normale Superiore, 56127 Pisa, Italy
| | - Valentina Zannier
- NEST Istituto Nanoscienze Consiglio Nazionale delle Ricerche (CNR) and Scuola Normale Superiore, 56127 Pisa, Italy
| | - Francesca Rossi
- Istituto dei Materiali per l'Elettronica ed il Magnetismo (IMEM)-Consiglio Nazionale delle Ricerche (CNR), Parco Area delle Scienze, 43124 Parma, Italy
| | - Anna Musiał
- Department of Experimental Physics, Wrocław University of Science and Technology, 50-370 Wrocław, Poland
| | - Jakub Boniecki
- Department of Experimental Physics, Wrocław University of Science and Technology, 50-370 Wrocław, Poland
| | - Grzegorz Sęk
- Department of Experimental Physics, Wrocław University of Science and Technology, 50-370 Wrocław, Poland
| | - Lucia Sorba
- NEST Istituto Nanoscienze Consiglio Nazionale delle Ricerche (CNR) and Scuola Normale Superiore, 56127 Pisa, Italy
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2
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Holewa P, Vajner DA, Zięba-Ostój E, Wasiluk M, Gaál B, Sakanas A, Burakowski M, Mrowiński P, Krajnik B, Xiong M, Yvind K, Gregersen N, Musiał A, Huck A, Heindel T, Syperek M, Semenova E. High-throughput quantum photonic devices emitting indistinguishable photons in the telecom C-band. Nat Commun 2024; 15:3358. [PMID: 38637520 PMCID: PMC11026509 DOI: 10.1038/s41467-024-47551-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 04/05/2024] [Indexed: 04/20/2024] Open
Abstract
Single indistinguishable photons at telecom C-band wavelengths are essential for quantum networks and the future quantum internet. However, high-throughput technology for single-photon generation at 1550 nm remained a missing building block to overcome present limitations in quantum communication and information technologies. Here, we demonstrate the high-throughput fabrication of quantum-photonic integrated devices operating at C-band wavelengths based on epitaxial semiconductor quantum dots. Our technique enables the deterministic integration of single pre-selected quantum emitters into microcavities based on circular Bragg gratings. Respective devices feature the triggered generation of single photons with ultra-high purity and record-high photon indistinguishability. Further improvements in yield and coherence properties will pave the way for implementing single-photon non-linear devices and advanced quantum networks at telecom wavelengths.
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Affiliation(s)
- Paweł Holewa
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370, Wrocław, Poland.
- DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Ørsteds Plads 343, DK-2800, Kongens Lyngby, Denmark.
- NanoPhoton - Center for Nanophotonics, Technical University of Denmark, Ørsteds Plads 345A, DK-2800, Kongens Lyngby, Denmark.
| | - Daniel A Vajner
- Institute of Solid State Physics, Technische Universität Berlin, 10623, Berlin, Germany
| | - Emilia Zięba-Ostój
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370, Wrocław, Poland
| | - Maja Wasiluk
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370, Wrocław, Poland
| | - Benedek Gaál
- DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Ørsteds Plads 343, DK-2800, Kongens Lyngby, Denmark
| | - Aurimas Sakanas
- DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Ørsteds Plads 343, DK-2800, Kongens Lyngby, Denmark
| | - Marek Burakowski
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370, Wrocław, Poland
| | - Paweł Mrowiński
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370, Wrocław, Poland
| | - Bartosz Krajnik
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370, Wrocław, Poland
| | - Meng Xiong
- DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Ørsteds Plads 343, DK-2800, Kongens Lyngby, Denmark
- NanoPhoton - Center for Nanophotonics, Technical University of Denmark, Ørsteds Plads 345A, DK-2800, Kongens Lyngby, Denmark
| | - Kresten Yvind
- DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Ørsteds Plads 343, DK-2800, Kongens Lyngby, Denmark
- NanoPhoton - Center for Nanophotonics, Technical University of Denmark, Ørsteds Plads 345A, DK-2800, Kongens Lyngby, Denmark
| | - Niels Gregersen
- DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Ørsteds Plads 343, DK-2800, Kongens Lyngby, Denmark
| | - Anna Musiał
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370, Wrocław, Poland
| | - Alexander Huck
- Center for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, DK-2800, Kongens Lyngby, Denmark
| | - Tobias Heindel
- Institute of Solid State Physics, Technische Universität Berlin, 10623, Berlin, Germany
| | - Marcin Syperek
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370, Wrocław, Poland.
| | - Elizaveta Semenova
- DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Ørsteds Plads 343, DK-2800, Kongens Lyngby, Denmark.
- NanoPhoton - Center for Nanophotonics, Technical University of Denmark, Ørsteds Plads 345A, DK-2800, Kongens Lyngby, Denmark.
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3
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Burakowski M, Holewa P, Mrowiński P, Sakanas A, Musiał A, Sȩk G, Yvind K, Semenova E, Syperek M. Heterogeneous integration of single InAs/InP quantum dots with the SOI chip using direct bonding. Opt Express 2024; 32:10874-10886. [PMID: 38570950 DOI: 10.1364/oe.515223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Accepted: 02/09/2024] [Indexed: 04/05/2024]
Abstract
Quantum information processing with photons in small-footprint and highly integrated silicon-based photonic chips requires incorporating non-classical light sources. In this respect, self-assembled III-V semiconductor quantum dots (QDs) are an attractive solution, however, they must be combined with the silicon platform. Here, by utilizing the large-area direct bonding technique, we demonstrate the hybridization of InP and SOI chips, which allows for coupling single photons to the SOI chip interior, offering cost-effective scalability in setting up a multi-source environment for quantum photonic chips. We fabricate devices consisting of self-assembled InAs QDs embedded in the tapered InP waveguide (WG) positioned over the SOI-defined Si WG. Focusing on devices generating light in the telecom C-band compatible with the low-loss optical fiber networks, we demonstrate the light coupling between InP and SOI platforms by observing photons outcoupled at the InP-made circular Bragg grating outcoupler fabricated at the end of an 80 µm-long Si WG, and at the cleaved edge of the Si WG. Finally, for a device with suppressed multi-photon generation events exhibiting 80% single photon generation purity, we measure the photon number outcoupled at the cleaved facet of the Si WG. We estimate the directional on-chip photon coupling between the source and the Si WG to 5.1%.
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4
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Vajner D, Holewa P, Zięba-Ostój E, Wasiluk M, von Helversen M, Sakanas A, Huck A, Yvind K, Gregersen N, Musiał A, Syperek M, Semenova E, Heindel T. On-Demand Generation of Indistinguishable Photons in the Telecom C-Band Using Quantum Dot Devices. ACS Photonics 2024; 11:339-347. [PMID: 38405394 PMCID: PMC10885198 DOI: 10.1021/acsphotonics.3c00973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 12/22/2023] [Accepted: 12/26/2023] [Indexed: 02/27/2024]
Abstract
Semiconductor quantum dots (QDs) enable the generation of single and entangled photons, which are useful for various applications in photonic quantum technologies. Specifically for quantum communication via fiber-optical networks, operation in the telecom C-band centered around 1550 nm is ideal. The direct generation of QD-photons in this spectral range with high quantum-optical quality, however, remained challenging. Here, we demonstrate the coherent on-demand generation of indistinguishable photons in the telecom C-band from single QD devices consisting of InAs/InP QD-mesa structures heterogeneously integrated with a metallic reflector on a silicon wafer. Using pulsed two-photon resonant excitation of the biexciton-exciton radiative cascade, we observe Rabi rotations up to pulse areas of 4π and a high single-photon purity in terms of g(2)(0) = 0.005(1) and 0.015(1) for exciton and biexciton photons, respectively. Applying two independent experimental methods, based on fitting Rabi rotations in the emission intensity and performing photon cross-correlation measurements, we consistently obtain preparation fidelities at the π-pulse exceeding 80%. Finally, performing Hong-Ou-Mandel-type two-photon interference experiments, we obtain a photon-indistinguishability of the full photon wave packet of up to 35(3)%, representing a significant advancement in the photon-indistinguishability of single photons emitted directly in the telecom C-band.
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Affiliation(s)
- Daniel
A. Vajner
- Institute
of Solid State Physics, Technical University
of Berlin, 10623 Berlin, Germany
| | - Paweł Holewa
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland
- DTU
Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Kongens Lyngby 2800, Denmark
- NanoPhoton
− Center for Nanophotonics, Technical
University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Emilia Zięba-Ostój
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland
| | - Maja Wasiluk
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland
| | - Martin von Helversen
- Institute
of Solid State Physics, Technical University
of Berlin, 10623 Berlin, Germany
| | - Aurimas Sakanas
- DTU
Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Kongens Lyngby 2800, Denmark
| | - Alexander Huck
- Center
for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Kresten Yvind
- DTU
Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Kongens Lyngby 2800, Denmark
- NanoPhoton
− Center for Nanophotonics, Technical
University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Niels Gregersen
- DTU
Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Kongens Lyngby 2800, Denmark
| | - Anna Musiał
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland
| | - Marcin Syperek
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland
| | - Elizaveta Semenova
- DTU
Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Kongens Lyngby 2800, Denmark
- NanoPhoton
− Center for Nanophotonics, Technical
University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Tobias Heindel
- Institute
of Solid State Physics, Technical University
of Berlin, 10623 Berlin, Germany
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5
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Holewa P, Sakanas A, Gür UM, Mrowiński P, Huck A, Wang BY, Musiał A, Yvind K, Gregersen N, Syperek M, Semenova E. Bright Quantum Dot Single-Photon Emitters at Telecom Bands Heterogeneously Integrated on Si. ACS Photonics 2022; 9:2273-2279. [PMID: 35880068 PMCID: PMC9306001 DOI: 10.1021/acsphotonics.2c00027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Whereas the Si photonic platform is highly attractive for scalable optical quantum information processing, it lacks practical solutions for efficient photon generation. Self-assembled semiconductor quantum dots (QDs) efficiently emit photons in the telecom bands (1460-1625 nm) and allow for heterogeneous integration with Si. In this work, we report on a novel, robust, and industry-compatible approach for achieving single-photon emission from InAs/InP QDs heterogeneously integrated with a Si substrate. As a proof of concept, we demonstrate a simple vertical emitting device, employing a metallic mirror beneath the QD emitter, and experimentally obtained photon extraction efficiencies of ∼10%. Nevertheless, the figures of merit of our structures are comparable with values previously only achieved for QDs emitting at shorter wavelength or by applying technically demanding fabrication processes. Our architecture and the simple fabrication procedure allows for the demonstration of high-purity single-photon generation with a second-order correlation function at zero time delay, g (2)(τ = 0) < 0.02, without any corrections at continuous wave excitation at the liquid helium temperature and preserved up to 50 K. For pulsed excitation, we achieve the as-measured g (2)(0) down to 0.205 ± 0.020 (0.114 ± 0.020 with background coincidences subtracted).
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Affiliation(s)
- Paweł Holewa
- Laboratory
for Optical Spectroscopy of Nanostructures, Faculty of Fundamental
Problems of Technology, Department of Experimental Physics, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland
- DTU
Fotonik, Technical University of Denmark, Kongens Lyngby 2800, Denmark
| | - Aurimas Sakanas
- DTU
Fotonik, Technical University of Denmark, Kongens Lyngby 2800, Denmark
| | - Ugur M. Gür
- DTU
Electrical Engineering, Technical University
of Denmark, Kongens Lyngby 2800, Denmark
| | - Paweł Mrowiński
- Laboratory
for Optical Spectroscopy of Nanostructures, Faculty of Fundamental
Problems of Technology, Department of Experimental Physics, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland
| | - Alexander Huck
- Center
for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, Kongens Lyngby 2800, Denmark
| | - Bi-Ying Wang
- DTU
Fotonik, Technical University of Denmark, Kongens Lyngby 2800, Denmark
- Hefei
National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Anna Musiał
- Laboratory
for Optical Spectroscopy of Nanostructures, Faculty of Fundamental
Problems of Technology, Department of Experimental Physics, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland
| | - Kresten Yvind
- DTU
Fotonik, Technical University of Denmark, Kongens Lyngby 2800, Denmark
- NanoPhoton-Center
for Nanophotonics, Technical University
of Denmark, Kongens Lyngby 2800, Denmark
| | - Niels Gregersen
- DTU
Fotonik, Technical University of Denmark, Kongens Lyngby 2800, Denmark
| | - Marcin Syperek
- Laboratory
for Optical Spectroscopy of Nanostructures, Faculty of Fundamental
Problems of Technology, Department of Experimental Physics, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland
| | - Elizaveta Semenova
- DTU
Fotonik, Technical University of Denmark, Kongens Lyngby 2800, Denmark
- NanoPhoton-Center
for Nanophotonics, Technical University
of Denmark, Kongens Lyngby 2800, Denmark
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6
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Zielińska A, Musiał A, Wyborski P, Kuniej M, Heuser T, Srocka N, Grosse J, Reithmaier JP, Benyoucef M, Rodt S, Reitzenstein S, Rudno-Rudziński W. Temperature dependence of refractive indices of Al 0.9Ga 0.1As and In 0.53Al 0.1Ga 0.37As in the telecommunication spectral range. Opt Express 2022; 30:20225-20240. [PMID: 36224773 DOI: 10.1364/oe.457952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 05/05/2022] [Indexed: 06/16/2023]
Abstract
In this work, we determine the temperature dependence of refractive indices of In0.53Al0.1Ga0.37As and Al0.9Ga0.1As semiconductor alloys at telecommunication wavelengths in the range from room temperature down to 10 K. For that, we measure the temperature-dependent reflectance of two structures: with an Al0.9Ga0.1As/GaAs distributed Bragg reflector (DBR) designed for 1.3 µm and with an In0.53Al0.1Ga0.37As/InP DBR designed for 1.55 µm. The obtained experimental results are compared to DBR reflectivity spectra calculated within the transfer matrix method to determine refractive index values. We further show that changes due to the thermal expansion of the DBR layers are negligible for our method.
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7
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Podemski P, Gawełczyk M, Wyborski P, Salamon H, Burakowski M, Musiał A, Reithmaier JP, Benyoucef M, Sęk G. Spin memory effect in charged single telecom quantum dots: erratum. Opt Express 2021; 29:36460. [PMID: 34809056 DOI: 10.1364/oe.445635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Indexed: 06/13/2023]
Abstract
This erratum corrects the value of the wetting layer thickness provided in our Article [Opt. Express29, 34024 (2021)10.1364/OE.438708]. This misprint does not influence the results and conclusions presented in the original Article.
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8
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Smołka T, Posmyk K, Wasiluk M, Wyborski P, Gawełczyk M, Mrowiński P, Mikulicz M, Zielińska A, Reithmaier JP, Musiał A, Benyoucef M. Optical Quality of InAs/InP Quantum Dots on Distributed Bragg Reflector Emitting at 3rd Telecom Window Grown by Molecular Beam Epitaxy. Materials (Basel) 2021; 14:6270. [PMID: 34771794 PMCID: PMC8585182 DOI: 10.3390/ma14216270] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 10/09/2021] [Accepted: 10/18/2021] [Indexed: 11/23/2022]
Abstract
We present an experimental study on the optical quality of InAs/InP quantum dots (QDs). Investigated structures have application relevance due to emission in the 3rd telecommunication window. The nanostructures are grown by ripening-assisted molecular beam epitaxy. This leads to their unique properties, i.e., low spatial density and in-plane shape symmetry. These are advantageous for non-classical light generation for quantum technologies applications. As a measure of the internal quantum efficiency, the discrepancy between calculated and experimentally determined photon extraction efficiency is used. The investigated nanostructures exhibit close to ideal emission efficiency proving their high structural quality. The thermal stability of emission is investigated by means of microphotoluminescence. This allows to determine the maximal operation temperature of the device and reveal the main emission quenching channels. Emission quenching is predominantly caused by the transition of holes and electrons to higher QD's levels. Additionally, these carriers could further leave the confinement potential via the dense ladder of QD states. Single QD emission is observed up to temperatures of about 100 K, comparable to the best results obtained for epitaxial QDs in this spectral range. The fundamental limit for the emission rate is the excitation radiative lifetime, which spreads from below 0.5 to almost 1.9 ns (GHz operation) without any clear spectral dispersion. Furthermore, carrier dynamics is also determined using time-correlated single-photon counting.
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Affiliation(s)
- Tristan Smołka
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (T.S.); (K.P.); (M.W.); (P.W.); (P.M.); (M.M.); (A.Z.)
| | - Katarzyna Posmyk
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (T.S.); (K.P.); (M.W.); (P.W.); (P.M.); (M.M.); (A.Z.)
| | - Maja Wasiluk
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (T.S.); (K.P.); (M.W.); (P.W.); (P.M.); (M.M.); (A.Z.)
| | - Paweł Wyborski
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (T.S.); (K.P.); (M.W.); (P.W.); (P.M.); (M.M.); (A.Z.)
| | - Michał Gawełczyk
- Department of Theoretical Physics, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland;
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, ul. Grudziądzka 5, 87-100 Toruń, Poland
| | - Paweł Mrowiński
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (T.S.); (K.P.); (M.W.); (P.W.); (P.M.); (M.M.); (A.Z.)
| | - Monika Mikulicz
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (T.S.); (K.P.); (M.W.); (P.W.); (P.M.); (M.M.); (A.Z.)
| | - Agata Zielińska
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (T.S.); (K.P.); (M.W.); (P.W.); (P.M.); (M.M.); (A.Z.)
| | - Johann Peter Reithmaier
- Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), Institute of Nanostructure Technologies and Analytics (INA), University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany;
| | - Anna Musiał
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (T.S.); (K.P.); (M.W.); (P.W.); (P.M.); (M.M.); (A.Z.)
| | - Mohamed Benyoucef
- Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), Institute of Nanostructure Technologies and Analytics (INA), University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany;
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9
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Podemski P, Gawełczyk M, Wyborski P, Salamon H, Burakowski M, Musiał A, Reithmaier JP, Benyoucef M, Sęk G. Spin memory effect in charged single telecom quantum dots. Opt Express 2021; 29:34024-34034. [PMID: 34809201 DOI: 10.1364/oe.438708] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 09/24/2021] [Indexed: 06/13/2023]
Abstract
Single InP-based quantum dots emitting in the third telecom window are probed quasi-resonantly in polarization-resolved microphotoluminescence experiments. For charged quantum dots we observe negative circular polarization being a fingerprint of the optical spin writing of the carriers within the quantum dots. The investigated quantum dots have a very dense ladder of excited states providing relatively easy quasi-resonant optical excitation, and together with telecom wavelengths emission they bring quantum gates and memories closer to compatibility with fiber-optic communication.
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Wroński PA, Wyborski P, Musiał A, Podemski P, Sęk G, Höfling S, Jabeen F. Metamorphic Buffer Layer Platform for 1550 nm Single-Photon Sources Grown by MBE on (100) GaAs Substrate. Materials (Basel) 2021; 14:5221. [PMID: 34576444 PMCID: PMC8467047 DOI: 10.3390/ma14185221] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 09/06/2021] [Accepted: 09/07/2021] [Indexed: 11/24/2022]
Abstract
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.
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Affiliation(s)
- Piotr Andrzej Wroński
- Technische Physik, University of Würzburg and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Am Hubland, D-97074 Würzburg, Germany; (S.H.); (F.J.)
| | - Paweł Wyborski
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (A.M.); (P.P.); (G.S.)
| | - Anna Musiał
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (A.M.); (P.P.); (G.S.)
| | - Paweł Podemski
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (A.M.); (P.P.); (G.S.)
| | - Grzegorz Sęk
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (A.M.); (P.P.); (G.S.)
| | - Sven Höfling
- Technische Physik, University of Würzburg and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Am Hubland, D-97074 Würzburg, Germany; (S.H.); (F.J.)
| | - Fauzia Jabeen
- Technische Physik, University of Würzburg and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Am Hubland, D-97074 Würzburg, Germany; (S.H.); (F.J.)
- Quantum Light and Matter Group, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, UK
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Rudno-Rudziński W, Burakowski M, Reithmaier JP, Musiał A, Benyoucef M. Magneto-Optical Characterization of Trions in Symmetric InP-Based Quantum Dots for Quantum Communication Applications. Materials (Basel) 2021; 14:ma14040942. [PMID: 33671208 PMCID: PMC7922152 DOI: 10.3390/ma14040942] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 02/13/2021] [Accepted: 02/14/2021] [Indexed: 12/05/2022]
Abstract
Magneto-optical parameters of trions in novel large and symmetric InP-based quantum dots, uncommon for molecular beam epitaxy-grown nanostructures, with emission in the third telecom window, are measured in Voigt and Faraday configurations of an external magnetic field. The diamagnetic coefficients are found to be in the range of 1.5–4 μeV/T2, and 8–15 μeV/T2, respectively out-of-plane and in-plane of the dots. The determined values of diamagnetic shifts are related to the anisotropy of dot sizes. Trion g-factors are measured to be relatively small, in the range of 0.3–0.7 and 0.5–1.3, in both configurations, respectively. Analysis of single carrier g-factors, based on the formalism of spin-correlated orbital currents, leads to similar values for hole and electron of ~0.25 for Voigt and ge ≈ −5; gh ≈ +6 for Faraday configuration of the magnetic field. Values of g-factors close to zero measured in Voigt configuration make the investigated dots promising for electrical tuning of the g-factor sign, required for schemes of single spin control in qubit applications.
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Affiliation(s)
- Wojciech Rudno-Rudziński
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (M.B.); (A.M.)
- Correspondence: (W.R.-R.); (M.B.); Tel.: +48-71-320-29-86 (W.R.-R.); +49-561-804-4553 (M.B.)
| | - Marek Burakowski
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (M.B.); (A.M.)
| | - Johann P. Reithmaier
- Institute of Nanostructure Technologies and Analytics (INA), Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany;
| | - Anna Musiał
- Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (M.B.); (A.M.)
| | - Mohamed Benyoucef
- Institute of Nanostructure Technologies and Analytics (INA), Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany;
- Correspondence: (W.R.-R.); (M.B.); Tel.: +48-71-320-29-86 (W.R.-R.); +49-561-804-4553 (M.B.)
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Clarke E, Skrzat J, Mazur M, Musiał A, Sienkiewicz J, Radek M, Polguj M, Wysiadecki G. Anatomical variations of the superficial ulnar artery: case series observed on historical specimens prepared by Ludwik Karol Teichmann. Folia Morphol (Warsz) 2021; 81:227-233. [PMID: 33577075 DOI: 10.5603/fm.a2021.0014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 11/13/2020] [Accepted: 11/15/2020] [Indexed: 11/25/2022]
Abstract
BACKGROUND In this report we present a series of cases representing variant origin and course of the ulnar artery, namely the superficial ulnar artery, observed during the review of collection of historical specimens prepared in the 19th century by the prominent Polish anatomist Ludwik Karol Teichmann and his collaborators, exhibited in the Anatomy Museum of Jagiellonian University Medical College. RESULTS Three distinct variants of the superficial ulnar artery were found on anatomical specimens of the upper limb with arteries injected by using Teichmann's method. In case No. 1, the superficial ulnar artery originated from the brachial artery slightly above the interepicondylar line of the humerus. This aberrant vessel gave off the common interosseous artery in the upper half of the cubital fossa and then ran superficially to the bicipital aponeurosis and over the muscles arising from the medial epicondyle of the humerus. The cases No. 2 and 3 involved two similar variants of the superficial artery in which the common interosseous artery arose from the radial artery. In the unique case No. 4, the superficial ulnar artery arose from the radial artery. CONCLUSIONS The superficial ulnar artery shows diverse anatomy regarding its topography and blood supply territory. Orthopedic, hand, and plastic surgeons should be aware of anatomic variations of the SUA both in planning and in conducting surgeries of the upper limb.
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Affiliation(s)
- E Clarke
- Department of Normal and Clinical Anatomy, Chair of Anatomy and Histology, Medical University of Lodz, Poland
| | - J Skrzat
- Department of Anatomy, Jagiellonian University Medical College, Kraków, Poland
| | - M Mazur
- Department of Anatomy, Jagiellonian University Medical College, Kraków, Poland
| | - A Musiał
- Department of Anatomy, Jagiellonian University Medical College, Kraków, Poland
| | - J Sienkiewicz
- Department of Anatomy, Jagiellonian University Medical College, Kraków, Poland
| | - M Radek
- Department of Neurosurgery, Spine and Peripheral Nerve Surgery, Medical University of Lodz, University Hospital WAM-CSW, Łódź, Poland
| | - M Polguj
- Department of Normal and Clinical Anatomy, Chair of Anatomy and Histology, Medical University of Lodz, Poland
| | - G Wysiadecki
- Department of Normal and Clinical Anatomy, Chair of Anatomy and Histology, Medical University of Lodz, Poland.
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Wyborski P, Musiał A, Mrowiński P, Podemski P, Baumann V, Wroński P, Jabeen F, Höfling S, Sęk G. InP-Substrate-Based Quantum Dashes on a DBR as Single-Photon Emitters at the Third Telecommunication Window. Materials (Basel) 2021; 14:759. [PMID: 33562831 PMCID: PMC7915660 DOI: 10.3390/ma14040759] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 01/30/2021] [Accepted: 02/01/2021] [Indexed: 11/16/2022]
Abstract
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.
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Affiliation(s)
- Paweł Wyborski
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (A.M.); (P.M.); (P.P.); (G.S.)
| | - Anna Musiał
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (A.M.); (P.M.); (P.P.); (G.S.)
| | - Paweł Mrowiński
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (A.M.); (P.M.); (P.P.); (G.S.)
| | - Paweł Podemski
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (A.M.); (P.M.); (P.P.); (G.S.)
| | - Vasilij Baumann
- Technische Physik, University of Würzburg and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Am Hubland, D-97074 Würzburg, Germany; (V.B.); (P.W.); (F.J.); (S.H.)
| | - Piotr Wroński
- Technische Physik, University of Würzburg and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Am Hubland, D-97074 Würzburg, Germany; (V.B.); (P.W.); (F.J.); (S.H.)
| | - Fauzia Jabeen
- Technische Physik, University of Würzburg and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Am Hubland, D-97074 Würzburg, Germany; (V.B.); (P.W.); (F.J.); (S.H.)
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - Sven Höfling
- Technische Physik, University of Würzburg and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Am Hubland, D-97074 Würzburg, Germany; (V.B.); (P.W.); (F.J.); (S.H.)
- School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, UK
| | - Grzegorz Sęk
- Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland; (A.M.); (P.M.); (P.P.); (G.S.)
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14
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Brzegowy K, Zarzecki MP, Musiał A, Aziz HM, Kasprzycki T, Tubbs RS, Popiela T, Walocha JA. The Internal Cerebral Vein: New Classification of Branching Patterns Based on CTA. AJNR Am J Neuroradiol 2019; 40:1719-1724. [PMID: 31488502 PMCID: PMC7028541 DOI: 10.3174/ajnr.a6200] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 07/25/2019] [Indexed: 12/29/2022]
Abstract
BACKGROUND AND PURPOSE The internal cerebral vein begins at the foramen of Monro by the union of the thalamostriate and the anterior septal veins. The lateral direct vein is its other major tributary. Numerous researchers have reported differences in internal cerebral vein branching patterns but did not classify them. Hence, the objectives of this study were to evaluate the anatomy of the internal cerebral vein and its primary tributaries and classify them depending on their course patterns using CTA. MATERIALS AND METHODS Head CTAs of 250 patients were evaluated in this study, in which we identified the number and termination of the anterior septal vein and the lateral direct vein. The course of the lateral direct vein and its influence on the number of thalamostriate veins and their diameters and courses were assessed. The anterior septal vein-internal cerebral vein junctions and their locations in relation to the foramen of Monro also were evaluated. RESULTS We classified internal cerebral vein branching patterns into 4 types depending on the presence of an extra vessel draining the striatum. Most commonly, the internal cerebral vein continued further as 1 thalamostriate vein (77%). The lateral direct veins were identified in 22% of the hemispheres, and usually they terminated at the middle third of the internal cerebral vein (65.45%). The most common location of the anterior septal vein-internal cerebral vein junction was anterior (57.20%), with the anterior septal vein terminating at the venous angle. CONCLUSIONS Detailed knowledge of the anatomy of the deep cerebral veins is of great importance in neuroradiology and neurosurgery because iatrogenic injury to the veins may result in basal nuclei infarcts. A classification of internal cerebral vein branching patterns may aid clinicians in planning approaches to the third and lateral ventricles.
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Affiliation(s)
- K Brzegowy
- From the Department of Anatomy (K.B., M.P.Z., A.M., H.M.A., T.K., J.A.W.), Jagiellonian University Medical College, Krakow, Poland
| | - M P Zarzecki
- From the Department of Anatomy (K.B., M.P.Z., A.M., H.M.A., T.K., J.A.W.), Jagiellonian University Medical College, Krakow, Poland
| | - A Musiał
- From the Department of Anatomy (K.B., M.P.Z., A.M., H.M.A., T.K., J.A.W.), Jagiellonian University Medical College, Krakow, Poland
| | - H M Aziz
- From the Department of Anatomy (K.B., M.P.Z., A.M., H.M.A., T.K., J.A.W.), Jagiellonian University Medical College, Krakow, Poland
| | - T Kasprzycki
- From the Department of Anatomy (K.B., M.P.Z., A.M., H.M.A., T.K., J.A.W.), Jagiellonian University Medical College, Krakow, Poland
| | - R S Tubbs
- Seattle Science Foundation (R.S.T.), Seattle, Washington
| | - T Popiela
- Departments of Radiology and Rescue Medicine and Multiorgan Trauma (T.P.), University Hospital, Krakow, Poland
| | - J A Walocha
- From the Department of Anatomy (K.B., M.P.Z., A.M., H.M.A., T.K., J.A.W.), Jagiellonian University Medical College, Krakow, Poland
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Żołnacz K, Musiał A, Srocka N, Große J, Schlösinger MJ, Schneider PI, Kravets O, Mikulicz M, Olszewski J, Poturaj K, Wójcik G, Mergo P, Dybka K, Dyrkacz M, Dłubek M, Rodt S, Burger S, Zschiedrich L, Sęk G, Reitzenstein S, Urbańczyk W. Method for direct coupling of a semiconductor quantum dot to an optical fiber for single-photon source applications. Opt Express 2019; 27:26772-26785. [PMID: 31674552 DOI: 10.1364/oe.27.026772] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Accepted: 08/24/2019] [Indexed: 06/10/2023]
Abstract
We present an effective method for direct fiber coupling of a quantum dot (QD) that is deterministically incorporated into a cylindrical mesa. For precise positioning of the fiber with respect to the QD-mesa, we use a scanning procedure relying on interference of light reflected back from the fiber end-face and the top surface of the mesa, applicable for both single-mode and multi-mode fibers. The central part of the fiber end-face is etched to control the required distance between the top surface of the mesa and the fiber core. Emission around 1260 nm from a fiber-coupled InGaAs/GaAs QD is demonstrated and its stability is proven over multiple cooling cycles. Moreover, a single photon character of emission from such system for a line emitting above 1200 nm is proven experimentally by photon autocorrelation measurements with an obtained value of the second order correlation function at zero time-delay well below 0.5.
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Dusanowski Ł, Holewa P, Maryński A, Musiał A, Heuser T, Srocka N, Quandt D, Strittmatter A, Rodt S, Misiewicz J, Reitzenstein S, Sęk G. Triggered high-purity telecom-wavelength single-photon generation from p-shell-driven InGaAs/GaAs quantum dot. Opt Express 2017; 25:31122-31129. [PMID: 29245789 DOI: 10.1364/oe.25.031122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 10/27/2017] [Indexed: 06/07/2023]
Abstract
We report on the experimental demonstration of triggered single-photon emission at the telecom O-band from In(Ga)As/GaAs quantum dots (QDs) grown by metal-organic vapor-phase epitaxy. Micro-photoluminescence excitation experiments allowed us to identify the p-shell excitonic states in agreement with high excitation photoluminescence on the ensemble of QDs. Hereby we drive an O-band-emitting GaAs-based QD into the p-shell states to get a triggered single photon source of high purity. Applying pulsed p-shell resonant excitation results in strong suppression of multiphoton events evidenced by the as measured value of the second-order correlation function at zero delay of 0.03 (and ~0.005 after background correction).
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Swora-Cwynar E, Karczewski J, Musiał A, Grzymisławski M, Marcinkowska E, Dobrowolska A, Mańkowska-Wierzbicka D. Assessment of nutritional status and feeding methods in patients with inflammatory bowel disease. JMS 2015. [DOI: 10.20883/medical.e14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Aim. The aim of this study was to evaluate diet of patients with IBD, their nutritional status and potential differences as compared to diet of healthy persons.Material and methods. The examination included the patients of Internal, Metabolic Diseases and Dietetics Ward and Gastroenterology, Internal Diseases and Human Nutrition Ward of Heliodor Święcicki Clinic in the Poznan University of Medical Sciences in Poznan. The criterion allowing participation into the study involved a diagnosed ulcerative or Crohn’s disease, basing on histopathology and radiological examination. The study was conducted on 50 patients, 25 women and 25 men. The control of group included 50 persons, 30 women and 20 men, potentially healthy and occupationally active. In the study the authors' own questionnaire was used, which contained questions related to diet and evaluating conditions of nutrition, based on the results of anthropometric measurements and selected biochemical parameters.Results. The study documented that IBD affected diet, which proved to be distinct from that of potentially healthy person. Course of the disease reduced some laboratory parameters in serum: decreased levels of total protein were detected in 40% patients, reduced levels of albumin in 28% patients and of haemoglobin in 72% patients with IBD. Most of patients introduced some modifications and dietary restrictions to reduce the symptoms and prolong remission. Presentation of such attitudes, indicates a need for an effective multidirectional education, which should affect a conscious decision making about the diet. The Body Mass Index and evaluation of nutrition demonstrated that IBD predisposed development of malnutrition: as compared to the control group, 28% of the patients manifested underweight.
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Więckowski K, Czaja A, Woźniak A, Musiał A, Malawska B. A study of the lipophilicity of amide derivatives ofα-(1,2,3,4-tetrahydroisoquinolin-2-yl)-γ-hydroxybutyric acid by use of RP-TLC and calculation. JPC-J PLANAR CHROMAT 2007. [DOI: 10.1556/jpc.20.2007.2.6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Malawska B, Kulig K, Gajda J, Szczeblewski D, Musiał A, Wieckowski K, Maciag D, Stables JP. Design, synthesis and pharmacological evaluation of alpha-substituted N-benzylamides of gamma-hydroxybutyric acid with potential GABA-ergic activity. Part 6. Search for new anticonvulsant compounds. Acta Pol Pharm 2007; 64:127-37. [PMID: 17665862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
In the recent study we have extended our investigations to the new anticonvulsant derivatives of alpha-substituted N-benzylamides of gamma-hydroxybutyric acid (GHB). Among the obtained compounds N-benzylamide of alpha-(1,2,3,4-tetrahydroisoquinoline)-GHB (9) has demonstrated activity against maximal electroshock (MES) induced seizures in mice (at 100 mg/kg ip) and in rats (at 30 mg/kg, po dose). Lactone 8 and amide 9 have possessed a weak effect on [3H]-muscimol binding. Molecular modeling studies have revealed that anticonvulsant activity of the alpha-substituted amides of GHB might partially be explained by the orientation of the terminal benzylamide fragment.
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Affiliation(s)
- Barbara Malawska
- Department of Physicochemical Drug Analysis, Faculty of Pharmacy, Jagiellonian University, Medical College, Medyczna 9, 30-688 Kraków, Poland.
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Musiał A, Malawska B. Synthesis of novel N-alkyl carbamates of a-substituted amides of g-hydroxybutyric acid as potential acetylcholinesterase inhibitors. Acta Pol Pharm 2004; 61 Suppl:94-7. [PMID: 15909954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
In a search for new acetylcholinesterase (AChE) inhibitors, derivatives of N-alkyl carbamates of a-substituted N-benzylamides of g-hydroxybutyric acid (GHB) 2(a-d); 3(a-d); 4(a-d) were obtained. Starting from 3-bromo-tetrahydrofuran-2-one, and N-phenylpiperazine 3-(4-phenylpiperazin-1-yl) tetrahydrofuran-2-one (1) was obtained. The aminolysis of lactone 1 with 4-substituted derivatives of benzylamine yielded N-substituted benzylamides of a-(4-phenylpiperazin-1-yl)-g-hydroxy-butyric acid (2-4). The target compounds were prepared by refluxing N-substituted benzyl-amides of a-(4-phenylpiperazinyl-1-)-GHB with ethyl-, i-propyl-, n-propyl- or n-butyl-isocyanate in dry acetonitrile. The inhibitory potency of AChE was evaluated by means of Ellman's in vitro test.
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Affiliation(s)
- Anna Musiał
- Department of Pharmaceutical Chemistry Jagiellonian University Medical College, 9 Medyczna Str., 30-688 Kraków
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