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15 results on '"Kapaldo, J."'

1. Excitonic lasing of strain-free InP(As) quantum dots in AlInAs microdisk

Author

Lebedev, D. V., Kulagina, M. M., Troshkov, S. I., Bogdanov, A. A., Vlasov, A. S., Davydov, V. Yu., Smirnov, A. N., Merz, J. L., Kapaldo, J., Gocalinska, A., Juska, G., Moroni, S. T., Pelucchi, E., Barettin, D., Rouvimov, S., and Mintairov, A. M.

Subjects
Physics - Optics
Abstract

Formation, emission and lasing properties of strain-free InP(As)/AlInAs quantum dots (QDs) embedded in AlInAs microdisk (MD) cavity were investigated using transmission electron microscopy and photoluminescence (PL) techniques. In MD structures, the QDs having nano-pan-cake shape have height of ~2 nm, lateral size of 20-50 nm and density of ~5x109 cm-2. Their emission observed at ~940 nm revealed strong temperature quenching, which points to exciton decomposition. It also showed unexpected type-I character indicating In-As intermixing, as confirmed by band structure calculations. We observed lasing of InP(As) QD excitons into whispering gallery modes in MD having dimeter ~3.2 mkm and providing free spectral range of ~27 nm and quality factors up to Q~13000. Threshold of ~50 W/cm2 and spontaneous emission coupling coefficient of ~0.2 were measured for this MD-QD system.

Published
2017
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5. Control of Wigner localization and electron cavity effects in near-field emission spectra of In(Ga)P/GaInP quantum-dot structures

Author

Mintairov, A. M., primary, Kapaldo, J., additional, Merz, J. L., additional, Rouvimov, S., additional, Lebedev, D. V., additional, Kalyuzhnyy, N. A., additional, Mintairov, S. A., additional, Belyaev, K. G., additional, Rakhlin, M. V., additional, Toropov, A. A., additional, Brunkov, P. N., additional, Vlasov, A. S., additional, Zadiranov, Yu. M., additional, Blundell, S. A., additional, Mozharov, A. M., additional, Mukhin, I., additional, Yakimov, M., additional, Oktyabrsky, S., additional, Shelaev, A. V., additional, and Bykov, V. A., additional

Published
2018
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8. Excitonic lasing of strain-free InP(As) quantum dots in AlInAs microdisk

Author

Lebedev, D. V., primary, Kulagina, M. M., additional, Troshkov, S. I., additional, Vlasov, A. S., additional, Davydov, V. Y., additional, Smirnov, A. N., additional, Bogdanov, A. A., additional, Merz, J. L., additional, Kapaldo, J., additional, Gocalinska, A., additional, Juska, G., additional, Moroni, S. T., additional, Pelucchi, E., additional, Barettin, D., additional, Rouvimov, S., additional, and Mintairov, A. M., additional

Published
2017
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9. Лазерная генерация в микродисках с активной областью на основе решеточно-согласованных InP/AlInAs наноструктур

Author

Лебедев, Д.В., primary, Минтаиров, А.М., primary, Власов, А.С., primary, Давыдов, В.Ю., primary, Кулагина, М.М., primary, Трошков, С.И., primary, Богданов, А.А., primary, Смирнов, А.Н., primary, Gocalinska, A., primary, Juska, G., primary, Pelucchi, E., primary, Kapaldo, J., primary, Rouvimov, S., primary, and Merz, J.L., primary

Published
2017
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10. Ga–In intermixing, intrinsic doping, and Wigner localization in the emission spectra of self-organized InP/GaInP quantum dots

Author

Kapaldo, J, primary, Rouvimov, S, additional, Merz, J L, additional, Oktyabrsky, S, additional, Blundell, S A, additional, Bert, N, additional, Brunkov, P, additional, Kalyuzhnyy, N A, additional, Mintairov, S A, additional, Nekrasov, S, additional, Saly, R, additional, Vlasov, A S, additional, and Mintairov, A M, additional

Published
2016
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11. Lasing of InP/AlInAs quantum dots in AlInAs microdisk cavity

Author

Lebedev, D V, primary, Mintairov, A M, additional, Kulagina, M M, additional, Troshkov, S I, additional, Kapaldo, J, additional, Merz, J L, additional, Rouvimov, S, additional, Juska, G, additional, Gocalinska, A, additional, Moroni, S T, additional, and Pelucchi, E, additional

Published
2016
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13. Time-of-flight-photoelectron emission microscopy on plasmonic structures using attosecond extreme ultraviolet pulses

Author

Süßmann, F., primary, Späth, C., additional, Wirth, A., additional, Schmidt, J., additional, Zherebtsov, S., additional, Guggenmos, A., additional, Oelsner, A., additional, Weber, N., additional, Kapaldo, J., additional, Gliserin, A., additional, Stockman, M. I., additional, Kling, M. F., additional, and Kleineberg, U., additional

Published
2012
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14. Time-of-flight-photoelectron emission microscopy on plasmonic structures using attosecond extreme ultraviolet pulses.

Author

Chew, S. H., Süßmann, F., Späth, C., Wirth, A., Schmidt, J., Zherebtsov, S., Guggenmos, A., Oelsner, A., Weber, N., Kapaldo, J., Gliserin, A., Stockman, M. I., Kling, M. F., and Kleineberg, U.

Subjects
ATTOSECOND pulses, PHOTOEMISSION, ELECTRON emission, PLASMONS (Physics), CONDUCTION electrons
Abstract

We report on the imaging of plasmonic structures by time-of-flight-photoemission electron microscopy (ToF-PEEM) in combination with extreme ultraviolet (XUV) attosecond pulses from a high harmonic generation source. Characterization of lithographically fabricated Au structures using these ultrashort XUV pulses by ToF-PEEM shows a spatial resolution of ∼200 nm. Energy-filtered imaging of the secondary electrons resulting in reduced chromatic aberrations as well as microspectroscopic identification of core and valence band electronic states have been successfully proven. We also find that the fast valence band electrons are not influenced by space charge effects, which is essentially important for attosecond nanoplasmonic-field microscopy realization. [ABSTRACT FROM AUTHOR]

Published
2012
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15. Large-Scale Image Analysis for Investigating Spatio-Temporal Changes in Nuclear DNA Damage Caused by Nitrogen Atmospheric Pressure Plasma Jets.

Author

Han X, Kapaldo J, Liu Y, Stack MS, Alizadeh E, and Ptasinska S

Subjects
Atmospheric Pressure, Cell Cycle drug effects, Cell Cycle physiology, Cell Line, Tumor, Cell Nucleus genetics, DNA Breaks, Double-Stranded, Equipment Design, Head and Neck Neoplasms pathology, Head and Neck Neoplasms therapy, Humans, Image Processing, Computer-Assisted methods, Keratinocytes drug effects, Keratinocytes physiology, Machine Learning, Nitrogen adverse effects, Nitrogen pharmacology, Phosphorylation drug effects, Plasma Gases adverse effects, Plasma Gases chemistry, Spatio-Temporal Analysis, Squamous Cell Carcinoma of Head and Neck pathology, Squamous Cell Carcinoma of Head and Neck therapy, Cell Cycle genetics, DNA Damage, Head and Neck Neoplasms genetics, Plasma Gases pharmacology, Squamous Cell Carcinoma of Head and Neck genetics
Abstract

The effective clinical application of atmospheric pressure plasma jet (APPJ) treatments requires a well-founded methodology that can describe the interactions between the plasma jet and a treated sample and the temporal and spatial changes that result from the treatment. In this study, we developed a large-scale image analysis method to identify the cell-cycle stage and quantify damage to nuclear DNA in single cells. The method was then tested and used to examine spatio-temporal distributions of nuclear DNA damage in two cell lines from the same anatomic location, namely the oral cavity, after treatment with a nitrogen APPJ. One cell line was malignant, and the other, nonmalignant. The results showed that DNA damage in cancer cells was maximized at the plasma jet treatment region, where the APPJ directly contacted the sample, and declined radially outward. As incubation continued, DNA damage in cancer cells decreased slightly over the first 4 h before rapidly decreasing by approximately 60% at 8 h post-treatment. In nonmalignant cells, no damage was observed within 1 h after treatment, but damage was detected 2 h after treatment. Notably, the damage was 5-fold less than that detected in irradiated cancer cells. Moreover, examining damage with respect to the cell cycle showed that S phase cells were more susceptible to DNA damage than either G1 or G2 phase cells. The proposed methodology for large-scale image analysis is not limited to APPJ post-treatment applications and can be utilized to evaluate biological samples affected by any type of radiation, and, more so, the cell-cycle classification can be used on any cell type with any nuclear DNA staining.

Published
2020
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