A. Dikovska, N. Nedyalkov, T. Dilova, G. Atanasova, Georgi Avdeev, Plamen Stefanov
We report the fabrication of gas sensor elements by pulsed laser deposition in air at atmospheric pressure. We focused our attention on metal-oxide semiconductors, namely, SnO2, TiO2 and MoO3 and studied the samples’ structure and morphology. The deposition technology applied leads to the formation of nanostructures composed of nanoparticles and nano-aggregates. We report preliminary results on the gas-sensing properties of the metal-oxide nanostructures. The sensors were exposed to CO, acetone and ethanol, with the TiO2 nanostructure demonstrating the highest response to CO exposure.
{"title":"Gas-sensing properties of metal-oxide nanostructures produced by PLD","authors":"A. Dikovska, N. Nedyalkov, T. Dilova, G. Atanasova, Georgi Avdeev, Plamen Stefanov","doi":"10.1117/12.2516753","DOIUrl":"https://doi.org/10.1117/12.2516753","url":null,"abstract":"We report the fabrication of gas sensor elements by pulsed laser deposition in air at atmospheric pressure. We focused our attention on metal-oxide semiconductors, namely, SnO2, TiO2 and MoO3 and studied the samples’ structure and morphology. The deposition technology applied leads to the formation of nanostructures composed of nanoparticles and nano-aggregates. We report preliminary results on the gas-sensing properties of the metal-oxide nanostructures. The sensors were exposed to CO, acetone and ethanol, with the TiO2 nanostructure demonstrating the highest response to CO exposure.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127899104","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}
A. Dakova, D. Dakova, V. Slavchev, L. Kovachev, S. Milenkova, Z. Kasapeteva
The problem with generating of new frequencies (signal and idler waves) in parametric four-photon processes without including the Raman scatter was solved only in approximation for a constant electric field or a constant intensity of the pump wave. The overall task which includes the change in intensity and the phase of the pump wave has not been studied in detail in the literature up to now. The main idea of present work is to solve the more general problem in which we have energy exchange between pump wave, signal and idler waves.
{"title":"Parametric four-photon mixing: exact analytical solutions in Jacobi functions","authors":"A. Dakova, D. Dakova, V. Slavchev, L. Kovachev, S. Milenkova, Z. Kasapeteva","doi":"10.1117/12.2518961","DOIUrl":"https://doi.org/10.1117/12.2518961","url":null,"abstract":"The problem with generating of new frequencies (signal and idler waves) in parametric four-photon processes without including the Raman scatter was solved only in approximation for a constant electric field or a constant intensity of the pump wave. The overall task which includes the change in intensity and the phase of the pump wave has not been studied in detail in the literature up to now. The main idea of present work is to solve the more general problem in which we have energy exchange between pump wave, signal and idler waves.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128016665","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}
Differential absorption lidar (DIAL) feasible to detect methane is developed on a pair of powerful pulsed (10μJ) laser diodes emitting on 1,56μm -1,66μm wavelengths. Methane is a potent greenhouse gas that is responsible for the present enhancement of the greenhouse effect. The spectral range of wavelengths utilized by the laser diodes matches an intensive second overtone of the methane molecule pure of interfering spectra of the other major atmospheric gases. Spectroscopic applications of the powerful laser diodes were generally limited by their broad laser line. Though spectrally unresolved, multiple resonance absorption lines modulate the laser radiation propagating in the atmosphere. The intensity of integral absorption is assessed combining the linestrengths taken from HITRAN database with the laser spectral line. The resultant absorption spectrum is immune to pressure variation, while the dependence on temperature is found to be within 10% error. The reported DIAL technique utilizes the advantage of simple operation within lidar ranges of 0.5- 5km prospective for reconnaissance of atmospheric methane and climatic monitoring.
{"title":"Application of paired powerful laser diodes for detection and reconnaissance of atmospheric methane","authors":"Stoyan Penchev, V. Pencheva","doi":"10.1117/12.2517438","DOIUrl":"https://doi.org/10.1117/12.2517438","url":null,"abstract":"Differential absorption lidar (DIAL) feasible to detect methane is developed on a pair of powerful pulsed (10μJ) laser diodes emitting on 1,56μm -1,66μm wavelengths. Methane is a potent greenhouse gas that is responsible for the present enhancement of the greenhouse effect. The spectral range of wavelengths utilized by the laser diodes matches an intensive second overtone of the methane molecule pure of interfering spectra of the other major atmospheric gases. Spectroscopic applications of the powerful laser diodes were generally limited by their broad laser line. Though spectrally unresolved, multiple resonance absorption lines modulate the laser radiation propagating in the atmosphere. The intensity of integral absorption is assessed combining the linestrengths taken from HITRAN database with the laser spectral line. The resultant absorption spectrum is immune to pressure variation, while the dependence on temperature is found to be within 10% error. The reported DIAL technique utilizes the advantage of simple operation within lidar ranges of 0.5- 5km prospective for reconnaissance of atmospheric methane and climatic monitoring.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121845338","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}
V. Atanassova, P. Penkova, I. Kostadinov, S. Karatodorov, G. Avdeev
This study is focused on the selective laser removal of chlorine-containing corrosion products from artificially corroded samples of copper, brass and steel. Its goal is to find an efficient methodology for laser cleaning of historical metallic objects. The laser treatment is done with two laser sources: Q switched Nd:YAG laser generating nanosecond pulses at 1 Hz repetition rate in the IR (1064 nm) and the green (510.6 nm) spectral range, and copper bromide vapor laser (CuBrVL) generating nanosecond pulses at 20 kHz repetition rate in the green (510.6 nm) spectral range. The cleaning is performed in dry and wet conditions. The surfaces before and after the treatment are characterized using optical microscopy (OM), x-ray fluorescence spectroscopy (XRF), x-ray diffraction spectroscopy (XRD), and laser-induced breakdown spectroscopy (LIBS).
{"title":"Laser removal of chlorine from historical metallic objects","authors":"V. Atanassova, P. Penkova, I. Kostadinov, S. Karatodorov, G. Avdeev","doi":"10.1117/12.2516813","DOIUrl":"https://doi.org/10.1117/12.2516813","url":null,"abstract":"This study is focused on the selective laser removal of chlorine-containing corrosion products from artificially corroded samples of copper, brass and steel. Its goal is to find an efficient methodology for laser cleaning of historical metallic objects. The laser treatment is done with two laser sources: Q switched Nd:YAG laser generating nanosecond pulses at 1 Hz repetition rate in the IR (1064 nm) and the green (510.6 nm) spectral range, and copper bromide vapor laser (CuBrVL) generating nanosecond pulses at 20 kHz repetition rate in the green (510.6 nm) spectral range. The cleaning is performed in dry and wet conditions. The surfaces before and after the treatment are characterized using optical microscopy (OM), x-ray fluorescence spectroscopy (XRF), x-ray diffraction spectroscopy (XRD), and laser-induced breakdown spectroscopy (LIBS).","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121741181","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}
K. Nasyrov, S. Gateva, R. K. Nasyrov, N. Petrov, S. Tsvetkov, A. Krasteva, S. Cartaleva
Significant modification of the spectrum of the D1 line of 85Rb in optical cells with high quality antirelaxation coating on the walls is studied experimentally and theoretically analyzed. The spectral profiles of hyperfine transitions are found to be significantly dependent on the velocity and the direction of the laser frequency scanning. A physical explanation is proposed for the observed features, which is confirmed by numerical simulations. The effect of small magnetic field on hyperfine spectrum is also discussed.
{"title":"Asymmetric frequency-tuning behavior of the D1 line hyperfine spectrum of Rb vapor contained in high quality paraffin coated optical cell","authors":"K. Nasyrov, S. Gateva, R. K. Nasyrov, N. Petrov, S. Tsvetkov, A. Krasteva, S. Cartaleva","doi":"10.1117/12.2516634","DOIUrl":"https://doi.org/10.1117/12.2516634","url":null,"abstract":"Significant modification of the spectrum of the D1 line of 85Rb in optical cells with high quality antirelaxation coating on the walls is studied experimentally and theoretically analyzed. The spectral profiles of hyperfine transitions are found to be significantly dependent on the velocity and the direction of the laser frequency scanning. A physical explanation is proposed for the observed features, which is confirmed by numerical simulations. The effect of small magnetic field on hyperfine spectrum is also discussed.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"1996 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131552345","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}
We report some preliminary results on experimental investigation of the potential of Light Induced Atomic Desorption (LIAD) applications for density control in antirelaxation coated cells and coherent spectroscopy. LIAD is a non-thermal process whereby atoms adsorbed on a surface are released under illumination. It is applied mostly to implementing optical atomic dispensers in the cases when high atomic density at low temperature is needed - for example, for loading atomic devices as atomic magnetometers, atomic clocks, atomic traps and their miniaturization. An advantage of the light control is that it is faster than the temperature control. More than an order of increase of the density with LIAD is obtained. Some peculiarities in the 780 nm absorption and fluorescence spectra registered in dense Rb vapor are registered. The absorption and fluorescence spectra in Rb vapors controlled by temperature and LIAD are compared.
{"title":"Light induced atomic desorption for spectroscopy of optically thick Rb atomic vapor","authors":"S. Tsvetkov, S. Gateva","doi":"10.1117/12.2516045","DOIUrl":"https://doi.org/10.1117/12.2516045","url":null,"abstract":"We report some preliminary results on experimental investigation of the potential of Light Induced Atomic Desorption (LIAD) applications for density control in antirelaxation coated cells and coherent spectroscopy. LIAD is a non-thermal process whereby atoms adsorbed on a surface are released under illumination. It is applied mostly to implementing optical atomic dispensers in the cases when high atomic density at low temperature is needed - for example, for loading atomic devices as atomic magnetometers, atomic clocks, atomic traps and their miniaturization. An advantage of the light control is that it is faster than the temperature control. More than an order of increase of the density with LIAD is obtained. Some peculiarities in the 780 nm absorption and fluorescence spectra registered in dense Rb vapor are registered. The absorption and fluorescence spectra in Rb vapors controlled by temperature and LIAD are compared.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131581353","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}
G. Dyankov, Ch. Kisov, E. Belina, E. Pavlova, E. Borisova, A. Gisbrecht, D. Ivanov
Apart from the huge physiological importance of hemo-, myo- globin and hemin, they play also an important role as robust and effective recognition agents in chemical and biological sensors. In this aspect the key factor in developing a reliable biosensor is the immobilization on the transducer. Usually immobilization can be produced by chemical methods, but there is frequently a need for homogeneous films of well-controlled thickness or films which can be deposited in a dry environment. The film thickness is of main importance for the optical transducer detected by Surface Plasmon Resonance (SPR) what is used in our study. Hundreds of immobilization protocols have been developed in an effort to ensure high performance sensing. All of them are focused on finding and deposition of appropriate matrices in which the recognition medium can be incorporated. However, the matrix always deteriorates the effectiveness of recognition. It seems that the best approach is to perform direct immobilization of the recognition medium. However, this is not always possible regarding the organic materials – the problem is whether the deposition retains the bioactivity of the recognition agent. On the other hand, the type of the transducer also imposes constrains. For example, the direct immobilization of the proteins is not possible for electrochemical sensors, because of the distance between the redox center and electrodes is too long. Evaluating the pros and cons of organic (protein) film deposition we have considered to study the possibility for direct immobilization of myoglobin, hemoglobin and hemin on SPR transducer. To best of our knowledge, SPR biochip with immobilized myoglobin, hemoglobin and hemin has never been constructed before. We have used spin coating, for direct immobilization and matrix-assisted pulsed-laser evaporation (MAPLE) for elaboration of the SPR biochip. The performance of both SPR chips – direct and MAPLE immobilized, was studied by SPR registration of the binding activity of myo- and hemo- globin ligands with carbon monoxide (CO), carbon dioxide (CO2) and nitride oxide (NO).
{"title":"Comparative study on the bio-activity of hemoglobin and myoglobin as recognition materials in biosensors","authors":"G. Dyankov, Ch. Kisov, E. Belina, E. Pavlova, E. Borisova, A. Gisbrecht, D. Ivanov","doi":"10.1117/12.2516536","DOIUrl":"https://doi.org/10.1117/12.2516536","url":null,"abstract":"Apart from the huge physiological importance of hemo-, myo- globin and hemin, they play also an important role as robust and effective recognition agents in chemical and biological sensors. In this aspect the key factor in developing a reliable biosensor is the immobilization on the transducer. Usually immobilization can be produced by chemical methods, but there is frequently a need for homogeneous films of well-controlled thickness or films which can be deposited in a dry environment. The film thickness is of main importance for the optical transducer detected by Surface Plasmon Resonance (SPR) what is used in our study. Hundreds of immobilization protocols have been developed in an effort to ensure high performance sensing. All of them are focused on finding and deposition of appropriate matrices in which the recognition medium can be incorporated. However, the matrix always deteriorates the effectiveness of recognition. It seems that the best approach is to perform direct immobilization of the recognition medium. However, this is not always possible regarding the organic materials – the problem is whether the deposition retains the bioactivity of the recognition agent. On the other hand, the type of the transducer also imposes constrains. For example, the direct immobilization of the proteins is not possible for electrochemical sensors, because of the distance between the redox center and electrodes is too long. Evaluating the pros and cons of organic (protein) film deposition we have considered to study the possibility for direct immobilization of myoglobin, hemoglobin and hemin on SPR transducer. To best of our knowledge, SPR biochip with immobilized myoglobin, hemoglobin and hemin has never been constructed before. We have used spin coating, for direct immobilization and matrix-assisted pulsed-laser evaporation (MAPLE) for elaboration of the SPR biochip. The performance of both SPR chips – direct and MAPLE immobilized, was studied by SPR registration of the binding activity of myo- and hemo- globin ligands with carbon monoxide (CO), carbon dioxide (CO2) and nitride oxide (NO).","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114934603","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}
Mineral dust and cirrus clouds are recognized to be among the major modulators of the atmospheric energy budget. Sahara Desert is the Earth’s largest source of mineral dust of natural origin. Saharan dust intrusions in the atmosphere over Europe are frequently accompanied by a parallel occurrence of cirrus clouds. Studies on the vertical aerosol distribution in such cases are important in providing a better understanding of the radiative effects of aerosols and clouds, and for the development of more accurate climate models. Lidars are considered as one of the leading techniques for conducting such studies, due to their high range/time resolution and sensitivity to optically-thin aerosol layers and clouds. In this work, we present results of lidar observations of the simultaneous presence of Saharan dust layers and cirrus clouds in the troposphere, with regard to their possible interaction, particularly in cases when the Saharan dust particles act as nuclei in cirrus cloud formation. Accordingly, experimental data derived from the regular long-term lidar investigations of Saharan dust loadings above Sofia, Bulgaria, are described and analyzed. The aerosol measurements were carried out by an elastic-backscatter lidar based on a frequency-doubled Nd:YAG laser. The experimental results are presented as color maps of the aerosol density distribution dynamics and by time-averaged vertical profiles of the aerosol backscatter coefficient. The process of cirrus cloud nucleation on desert dust particles is detected and analyzed in its development and evolution.
{"title":"Simultaneous vertical LIDAR profiling of Saharan dust layers and high-altitude cirrus clouds in the troposphere","authors":"A. Deleva, Z. Peshev, E. Krasteva, T. Dreischuh","doi":"10.1117/12.2516358","DOIUrl":"https://doi.org/10.1117/12.2516358","url":null,"abstract":"Mineral dust and cirrus clouds are recognized to be among the major modulators of the atmospheric energy budget. Sahara Desert is the Earth’s largest source of mineral dust of natural origin. Saharan dust intrusions in the atmosphere over Europe are frequently accompanied by a parallel occurrence of cirrus clouds. Studies on the vertical aerosol distribution in such cases are important in providing a better understanding of the radiative effects of aerosols and clouds, and for the development of more accurate climate models. Lidars are considered as one of the leading techniques for conducting such studies, due to their high range/time resolution and sensitivity to optically-thin aerosol layers and clouds. In this work, we present results of lidar observations of the simultaneous presence of Saharan dust layers and cirrus clouds in the troposphere, with regard to their possible interaction, particularly in cases when the Saharan dust particles act as nuclei in cirrus cloud formation. Accordingly, experimental data derived from the regular long-term lidar investigations of Saharan dust loadings above Sofia, Bulgaria, are described and analyzed. The aerosol measurements were carried out by an elastic-backscatter lidar based on a frequency-doubled Nd:YAG laser. The experimental results are presented as color maps of the aerosol density distribution dynamics and by time-averaged vertical profiles of the aerosol backscatter coefficient. The process of cirrus cloud nucleation on desert dust particles is detected and analyzed in its development and evolution.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116489346","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}
G. Carugno, C. Braggio, F. Chiossi, M. Guarise, A. Dainelli, R. Calabrese, A. Khanbekyan, E. Luppi, L. Tomassetti, C. Marinelli, E. Mariotti
Dark matter (DM) represents one of the most intriguing challenges of modern physics, both for the theoretical predictions and for the experimental setups. The search for the possible DM component candidates regards a wide range of objects and of energy values. In order to detect processes related to very weak interactions, as expected in these cases, it is necessary to improve the performances of the available detectors making them more efficient in terms of energy threshold and mass. Here we present a research activity aimed at the development of a novel type of detector based on laser interrogation of atomic energy levels for species that have been loaded in a solid matrix of a non interacting material at very low temperatures. The laser assisted transitions are only promoted when an incident particle is absorbed in the material, releasing its energy to the embedded atoms. The detection can be obtained via both optical and electronic methods.
{"title":"Dark matter search by laser spectroscopy","authors":"G. Carugno, C. Braggio, F. Chiossi, M. Guarise, A. Dainelli, R. Calabrese, A. Khanbekyan, E. Luppi, L. Tomassetti, C. Marinelli, E. Mariotti","doi":"10.1117/12.2517416","DOIUrl":"https://doi.org/10.1117/12.2517416","url":null,"abstract":"Dark matter (DM) represents one of the most intriguing challenges of modern physics, both for the theoretical predictions and for the experimental setups. The search for the possible DM component candidates regards a wide range of objects and of energy values. In order to detect processes related to very weak interactions, as expected in these cases, it is necessary to improve the performances of the available detectors making them more efficient in terms of energy threshold and mass. Here we present a research activity aimed at the development of a novel type of detector based on laser interrogation of atomic energy levels for species that have been loaded in a solid matrix of a non interacting material at very low temperatures. The laser assisted transitions are only promoted when an incident particle is absorbed in the material, releasing its energy to the embedded atoms. The detection can be obtained via both optical and electronic methods.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"223 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116035910","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}
The sciences of physics and quantum electronics are currently in the beginning of the second quantum revolution. If the main goal of the first quantum revolution can be formulated as the understanding of our physical world and its atomic and nuclear structures, today, during the second quantum revolution, we are able not only explain the Nature, but we are actively applying our understanding of the quantum world, for example, to create new artificial atoms (quantum dots) and develop new technologies and nanoscale quantum electronic devices based on the quantum dot (QD) arrays like QD lasers, QD memories, and quantum-dot cellular automata. The main objective of our work is to demonstrate that nanoscale cold electron emission schemes may offer an intriguing new technical methodology for compact fast vibration sensors. We propose an electronic displacement device by positioning a vibrating anode toward a special field electron emitter. Cold field electron emission from an array of quantum dots grown on SiC is applied, where the distance between the tip of emitting mounds and the counter-electrode (anode) is controlled by the moving object under study. To that end, field emission electron sources are built on a flexible substrate, which can take up and transfer the oscillations of a vibrating moving system into a change of the spacing distance between emitter and anode, and by this modulate the emission current density. As is derived from Fowler-Nordheim equations, sensitivity down to a few nanometers of vibration amplitude is possible. In conclusion, we compare our vibration detection scheme based on the quantum dot array with modern micro- and nano-photonic and laser-based devices.
{"title":"Quantum dot array built into a nanoscale vibration detection scheme and the comparison with microlasers-based devices","authors":"V. Serkin, A. Ramírez, A. Zehe","doi":"10.1117/12.2515990","DOIUrl":"https://doi.org/10.1117/12.2515990","url":null,"abstract":"The sciences of physics and quantum electronics are currently in the beginning of the second quantum revolution. If the main goal of the first quantum revolution can be formulated as the understanding of our physical world and its atomic and nuclear structures, today, during the second quantum revolution, we are able not only explain the Nature, but we are actively applying our understanding of the quantum world, for example, to create new artificial atoms (quantum dots) and develop new technologies and nanoscale quantum electronic devices based on the quantum dot (QD) arrays like QD lasers, QD memories, and quantum-dot cellular automata. The main objective of our work is to demonstrate that nanoscale cold electron emission schemes may offer an intriguing new technical methodology for compact fast vibration sensors. We propose an electronic displacement device by positioning a vibrating anode toward a special field electron emitter. Cold field electron emission from an array of quantum dots grown on SiC is applied, where the distance between the tip of emitting mounds and the counter-electrode (anode) is controlled by the moving object under study. To that end, field emission electron sources are built on a flexible substrate, which can take up and transfer the oscillations of a vibrating moving system into a change of the spacing distance between emitter and anode, and by this modulate the emission current density. As is derived from Fowler-Nordheim equations, sensitivity down to a few nanometers of vibration amplitude is possible. In conclusion, we compare our vibration detection scheme based on the quantum dot array with modern micro- and nano-photonic and laser-based devices.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116150195","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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