Pub Date : 2010-11-09DOI: 10.1109/LFNM.2010.5624217
H. Klym, I. Hadzaman, O. Shpotyuk
Temperature and humidity-sensitive thick-film structures based on spinel semiconducting ceramics different chemical composition (Cu0.1Ni0.1Co1.6Mn1.2O4 and Cu0.1Ni0.8Co0.2Mn1.9O4) and dielectric magnesium aluminate MgAl2O4 ceramics were fabricated and studied. These elements are shown to be successfully applied for integrated temperature/humidity sensors of environmental monitoring and control.
{"title":"Novel temperature/humidity-sensitive multilayer thick-film structures for integrated sensors application","authors":"H. Klym, I. Hadzaman, O. Shpotyuk","doi":"10.1109/LFNM.2010.5624217","DOIUrl":"https://doi.org/10.1109/LFNM.2010.5624217","url":null,"abstract":"Temperature and humidity-sensitive thick-film structures based on spinel semiconducting ceramics different chemical composition (Cu<inf>0.1</inf>Ni<inf>0.1</inf>Co<inf>1.6</inf>Mn<inf>1.2</inf>O<inf>4</inf> and Cu<inf>0.1</inf>Ni<inf>0.8</inf>Co<inf>0.2</inf>Mn<inf>1.9</inf>O<inf>4</inf>) and dielectric magnesium aluminate MgAl<inf>2</inf>O<inf>4</inf> ceramics were fabricated and studied. These elements are shown to be successfully applied for integrated temperature/humidity sensors of environmental monitoring and control.","PeriodicalId":117420,"journal":{"name":"2010 10th International Conference on Laser and Fiber-Optical Networks Modeling","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125490639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-09DOI: 10.1109/LFNM.2010.5624203
A. F. Polupanov, A. Kruglov
We demonstrate an explicit numerical method for accurate calculation of the scattering matrix, and its poles, and apply this method to describing the multi-channel holes scattering in multiple-quantum-wells (MQW) structures. The results of calculations show that in contrast to the single quantum-well case, at some values of MQW parameters the number of S-mat-rix poles may exceed that of the absolute reflection peaks, and at different values of parameters the absolute reflection peak corresponds to different resonant states. At some values of MQW parameters there is in fact a long-living over-barrier resonant hole state. Lifetimes of resonant states depend drastically on the quantum-well potential depth. In the case of sufficiently shallow quantum wells there is a single long-living resonant state.
{"title":"Resonant over-barrier hole states in multiple quantum wells","authors":"A. F. Polupanov, A. Kruglov","doi":"10.1109/LFNM.2010.5624203","DOIUrl":"https://doi.org/10.1109/LFNM.2010.5624203","url":null,"abstract":"We demonstrate an explicit numerical method for accurate calculation of the scattering matrix, and its poles, and apply this method to describing the multi-channel holes scattering in multiple-quantum-wells (MQW) structures. The results of calculations show that in contrast to the single quantum-well case, at some values of MQW parameters the number of S-mat-rix poles may exceed that of the absolute reflection peaks, and at different values of parameters the absolute reflection peak corresponds to different resonant states. At some values of MQW parameters there is in fact a long-living over-barrier resonant hole state. Lifetimes of resonant states depend drastically on the quantum-well potential depth. In the case of sufficiently shallow quantum wells there is a single long-living resonant state.","PeriodicalId":117420,"journal":{"name":"2010 10th International Conference on Laser and Fiber-Optical Networks Modeling","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121714339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-09DOI: 10.1109/LFNM.2010.5624179
O. Shulika, I. Sukhoivanov, M. Klymenko, I. M. Safonov, J. Lucio, A. G. Pérez, R. Rojas‐Laguna
Asymmetric multiple quantum well active regions for optically-pumped semiconductor disk lasers (OPS-DLs) are designed employing wave function engineering within GaAs/AlGaAs material system, which provide simultaneously good electronic confinement, large gain and effective carrier transport. Experimental investigation has shown that such an approach gives record values of the conversion efficiency among OPSDLs and provides high values of the output power.
{"title":"Band engineering of complex asymmetric multiple quantum wells for optically pumped semiconductor disk lasers","authors":"O. Shulika, I. Sukhoivanov, M. Klymenko, I. M. Safonov, J. Lucio, A. G. Pérez, R. Rojas‐Laguna","doi":"10.1109/LFNM.2010.5624179","DOIUrl":"https://doi.org/10.1109/LFNM.2010.5624179","url":null,"abstract":"Asymmetric multiple quantum well active regions for optically-pumped semiconductor disk lasers (OPS-DLs) are designed employing wave function engineering within GaAs/AlGaAs material system, which provide simultaneously good electronic confinement, large gain and effective carrier transport. Experimental investigation has shown that such an approach gives record values of the conversion efficiency among OPSDLs and provides high values of the output power.","PeriodicalId":117420,"journal":{"name":"2010 10th International Conference on Laser and Fiber-Optical Networks Modeling","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114963115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-09DOI: 10.1109/LFNM.2010.5624202
M. Klymenko, O. Shulika
Microscopic statistical theory of inhomogeneous broadening in InGaN/GaN quantum-well structures is developed. It is shown that inhomogeneous broadening can be described as energy-dependent daphasing time. Explicit relation between inhomogeneous broadening and spectral power density of the lateral interface potential fluctuations is derived.
{"title":"Microscopic statistical theory of Inhomogeneous broadening in InGaN/GaN quantum wells","authors":"M. Klymenko, O. Shulika","doi":"10.1109/LFNM.2010.5624202","DOIUrl":"https://doi.org/10.1109/LFNM.2010.5624202","url":null,"abstract":"Microscopic statistical theory of inhomogeneous broadening in InGaN/GaN quantum-well structures is developed. It is shown that inhomogeneous broadening can be described as energy-dependent daphasing time. Explicit relation between inhomogeneous broadening and spectral power density of the lateral interface potential fluctuations is derived.","PeriodicalId":117420,"journal":{"name":"2010 10th International Conference on Laser and Fiber-Optical Networks Modeling","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122792895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-09DOI: 10.1109/LFNM.2010.5624224
S. N. Mensov, Y. Polushtaytsev
The properties of the optical connection of single-mode fibers by laser beams counter-propagating from the ends of these fibers are considered numerically and experimentally. It is established that effective connection of single-mode fibers at the wavelength of 1.55 µm is possible during self-channeling and interaction of optical beams at 0.63 µm in a photo-polymerizing medium. It is shown by computer simulation and obtained experimentally that for the 1…2-mm-long polymer connector and the ∼15-µm radial displacement, the efficiency of the optical connection of the SMF-28 and CS-980 single-mode fibers in the photopolymerizable composite based on OCM-2 can achieve 80…90% and 50…60%, respectively.
{"title":"Computer simulation and experimental investigation of non-uniform polymeric structures optical formation for fibers interconnecting","authors":"S. N. Mensov, Y. Polushtaytsev","doi":"10.1109/LFNM.2010.5624224","DOIUrl":"https://doi.org/10.1109/LFNM.2010.5624224","url":null,"abstract":"The properties of the optical connection of single-mode fibers by laser beams counter-propagating from the ends of these fibers are considered numerically and experimentally. It is established that effective connection of single-mode fibers at the wavelength of 1.55 µm is possible during self-channeling and interaction of optical beams at 0.63 µm in a photo-polymerizing medium. It is shown by computer simulation and obtained experimentally that for the 1…2-mm-long polymer connector and the ∼15-µm radial displacement, the efficiency of the optical connection of the SMF-28 and CS-980 single-mode fibers in the photopolymerizable composite based on OCM-2 can achieve 80…90% and 50…60%, respectively.","PeriodicalId":117420,"journal":{"name":"2010 10th International Conference on Laser and Fiber-Optical Networks Modeling","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131453945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-09DOI: 10.1109/LFNM.2010.5624221
A. Filipenko, A. Ponomaryova
An automatic control technique of the cross-section microstructured optical fibers geometrical parameters is developed. This method can be used both in the control preform and in the process of drawing into an automated process control system for identify and predict the occurrence of the defect.
{"title":"Analysis of the dynamics shaping microstructured optical fiber during drawing process","authors":"A. Filipenko, A. Ponomaryova","doi":"10.1109/LFNM.2010.5624221","DOIUrl":"https://doi.org/10.1109/LFNM.2010.5624221","url":null,"abstract":"An automatic control technique of the cross-section microstructured optical fibers geometrical parameters is developed. This method can be used both in the control preform and in the process of drawing into an automated process control system for identify and predict the occurrence of the defect.","PeriodicalId":117420,"journal":{"name":"2010 10th International Conference on Laser and Fiber-Optical Networks Modeling","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133613233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-09DOI: 10.1109/LFNM.2010.5624187
D. Nuzhnyy, P. Vanĕk, J. Petzelt, V. Bovtun, M. Kempa, I. Gregora, M. Savinov, R. Krupková, V. Studnička, M. Samoylovich, A. Rinkevich, A. Belyanin, S. М. Klescheva
Using the sol-gel technique, BaTiO3 was embedded in opal matrices that are the lattice packings of silica dioxide nanospheres for the first time. The room-temperature IR and Raman spectra clearly show characteristic vibrational modes of the ferroelectrically distorted TiO6 octahedra without any long-range order. Raman spectra bring evidence of a diffuse ferroelectric phase transition in the opal-BaTiO3 composite.
{"title":"Properties of BaTiO3 confined in opal matrices — lattice packings of nanospheres silica dioxide","authors":"D. Nuzhnyy, P. Vanĕk, J. Petzelt, V. Bovtun, M. Kempa, I. Gregora, M. Savinov, R. Krupková, V. Studnička, M. Samoylovich, A. Rinkevich, A. Belyanin, S. М. Klescheva","doi":"10.1109/LFNM.2010.5624187","DOIUrl":"https://doi.org/10.1109/LFNM.2010.5624187","url":null,"abstract":"Using the sol-gel technique, BaTiO3 was embedded in opal matrices that are the lattice packings of silica dioxide nanospheres for the first time. The room-temperature IR and Raman spectra clearly show characteristic vibrational modes of the ferroelectrically distorted TiO6 octahedra without any long-range order. Raman spectra bring evidence of a diffuse ferroelectric phase transition in the opal-BaTiO3 composite.","PeriodicalId":117420,"journal":{"name":"2010 10th International Conference on Laser and Fiber-Optical Networks Modeling","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131078331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-09DOI: 10.1109/LFNM.2010.5624190
S. Starodub, S. Roshchupkin
Outside the framework of the dipole approximation (with an accuracy of about υ/c) the effective interaction force between stripped uranium nuclei in the presence pulsed field of two laser waves is theoretically studied. Possibility of essential slowing-down of uranium nuclei after interaction with each other is obtained. The given phenomenon is stable, concerning minor changes of initial conditions and is caused by incipient magnetic currents.
{"title":"The uranium nuclei attraction effect in the pulse field of two counter-propagating laser waves","authors":"S. Starodub, S. Roshchupkin","doi":"10.1109/LFNM.2010.5624190","DOIUrl":"https://doi.org/10.1109/LFNM.2010.5624190","url":null,"abstract":"Outside the framework of the dipole approximation (with an accuracy of about υ/c) the effective interaction force between stripped uranium nuclei in the presence pulsed field of two laser waves is theoretically studied. Possibility of essential slowing-down of uranium nuclei after interaction with each other is obtained. The given phenomenon is stable, concerning minor changes of initial conditions and is caused by incipient magnetic currents.","PeriodicalId":117420,"journal":{"name":"2010 10th International Conference on Laser and Fiber-Optical Networks Modeling","volume":"41 1-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132811818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-09DOI: 10.1109/LFNM.2010.5624171
M. Klymenko, O. Shulika
The influence of In surface segregation and internal fields induced by polarization charges on the band structure on InGaN/GaN quantum wells is studied in the frame of 6×6 multiband model. The indium surface segregation leads to the blue shift of the transition energy (70 meV for the segregation length 1nm at both heterointerfaces) while the piezoelectric polarization itself causes the red shift. Joint action of both effects leads to the linear dependence of the transition energy on the width of the quantum well. The piezoelectric polarization prevails for the high indium amount, and the indium surface segregation is dominated for the low indium amount.
{"title":"Band structure of InGaN/GaN quantum wells under influence of internal fields and indium surface segregation","authors":"M. Klymenko, O. Shulika","doi":"10.1109/LFNM.2010.5624171","DOIUrl":"https://doi.org/10.1109/LFNM.2010.5624171","url":null,"abstract":"The influence of In surface segregation and internal fields induced by polarization charges on the band structure on InGaN/GaN quantum wells is studied in the frame of 6×6 multiband model. The indium surface segregation leads to the blue shift of the transition energy (70 meV for the segregation length 1nm at both heterointerfaces) while the piezoelectric polarization itself causes the red shift. Joint action of both effects leads to the linear dependence of the transition energy on the width of the quantum well. The piezoelectric polarization prevails for the high indium amount, and the indium surface segregation is dominated for the low indium amount.","PeriodicalId":117420,"journal":{"name":"2010 10th International Conference on Laser and Fiber-Optical Networks Modeling","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114099120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-09DOI: 10.1109/LFNM.2010.5624164
P. Fomin, R. Kholodov
The process of photon emission, that accompany photon pair production in strong magnetic field has been studied in nonresonant case. Angle dependence and dependence on final photon polarization are analyzed for this process. Total probability for the nonresonant process of photon emission 106 s−1 is three order of magnitude less, than resonant one. PACS: 12.20.-m; 41.60. Ap; 42.25. Ja
{"title":"Nonresonant photoproduction of an electron-positron pair with radiation of a photon","authors":"P. Fomin, R. Kholodov","doi":"10.1109/LFNM.2010.5624164","DOIUrl":"https://doi.org/10.1109/LFNM.2010.5624164","url":null,"abstract":"The process of photon emission, that accompany photon pair production in strong magnetic field has been studied in nonresonant case. Angle dependence and dependence on final photon polarization are analyzed for this process. Total probability for the nonresonant process of photon emission 106 s−1 is three order of magnitude less, than resonant one. PACS: 12.20.-m; 41.60. Ap; 42.25. Ja","PeriodicalId":117420,"journal":{"name":"2010 10th International Conference on Laser and Fiber-Optical Networks Modeling","volume":"1172 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114170027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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