leo DiDomenico - Academia.edu (original) (raw)
Papers by leo DiDomenico
IEEE Transactions on Microwave Theory and Techniques, 2001
Applied Physics Letters, 1990
Superlattices of YBa2Cu3O7−x/YyPr1−yBa2Cu3O7−x(y=0.8 and 0.0) have been successfully grown insitu... more Superlattices of YBa2Cu3O7−x/YyPr1−yBa2Cu3O7−x(y=0.8 and 0.0) have been successfully grown insitu on MgO and LaAlO3 by using a multitarget pulsed laser deposition system. Satellite peaks have been observed in x-ray diffraction for the superlattices with modulation wavelengths from about few tens of angstroms to few hundred angstroms. The x-ray diffraction measurements also indicate that the multilayers have c axis normal to
A phase conjugation based method for full-duplex digi-tal communications is discussed. The method... more A phase conjugation based method for full-duplex digi-tal communications is discussed. The method uses a spa-tially confined and directive antenna pattern while a full-duplex digital communications link is maintained between moving platforms. The communications abilit ~ of the array is based on processing the phase associated with the mes-sage and the phase associated with the platform’s motion separately. Preliminary measurements at 6 GHz indicate that the phase conjugation method does allow simulators tracking and communications.
Abstract- A geosynchronous synthetic aperture radar (SAR) with an orbit inclination of 50–65 ° ca... more Abstract- A geosynchronous synthetic aperture radar (SAR) with an orbit inclination of 50–65 ° can provide daily coverage of all of North and South America. Longitudinally, the width of the mapped area would be on the order of ±50 ° at the Equator, somewhat more at the most northern/southern latitudes. Within the area mapped, very good temporal coverage can be obtained –up to several mappings during the 12 hours per day where the satellite is in the “right ” hemisphere. This would be a key capability in relation to disaster management, tectonic mapping and modeling, vegetation and soil moisture mapping, and for operational and semi-operational requirements. A constellation of geosynchronous satellites could provide global coverage. I. SCIENCE AND APPLICATIONS A geosynchronous SAR, with its fine temporal resolution, would overcome the limitations of current imaging systems,
Quantum entanglement has the potential to revolutionize the entire field of interferometric sensi... more Quantum entanglement has the potential to revolutionize the entire field of interferometric sensing by providing many Concepts of Physics, Vol. II (2005) 225orders of magnitude improvement in interferometer sensitivity. The quantum-entangled particle interferometer approach is very general and applies to many types of interferometers. In particular, without nonlocal entanglement, a generic classical interferometer has a statistical-sampling shot-noise limited sensitivity that scales like 1 / √ N, where N is the number of particles passing through the interferometer per unit time. However, if carefully prepared quantum correlations are engineered between the particles, then the interferometer sensitivity improves by a factor of √ N to scale like 1/N, which is the limit imposed by the Heisenberg Uncertainty Principle. For optical interferometers operating at milliwatts of
Quantum entanglement has the potential to revolutionize the entire field of interferometric sensi... more Quantum entanglement has the potential to revolutionize the entire field of interferometric sensing by providing many orders of magnitude improvement in interferometer sensitivity. The quantum entangled particle interferometer approach is very general and applies to many types of interferometers. In particular, without nonlocal entanglement, a generic classical interferometer has a statistical-sampling shot-noise limited sensitivity that scales like 1 / √ N,whereN is the number of particles passing through the interferometer per unit time. However, if carefully prepared quantum correlations are engineered between the particles, then the interferometer sensitivity improves by a factor of √ N to scale like 1/N, which is the limit imposed by the Heisenberg Uncertainty Principle. For optical interferometers operating at milliwatts of optical power, this quantum sensitivity boost corresponds to an eight-order-of-magnitude improvement of signal to noise. This effect can translate into a t...
A phase conjugation based method for full-duplex digital communications is discussed. The method ... more A phase conjugation based method for full-duplex digital communications is discussed. The method uses a spatially confined and directive antenna pattern while a fullduplex digital communications link is maintained between moving platforms. The communications abilit~ of the array is based on processing the phase associated with the message and the phase associated with the platform’s motion separately. Preliminary measurements at 6 GHz indicate that the phase conjugation method does allow simulators tracking and communications.
2002 9th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM], 2002
One method to dramatically reduce the weight, volume and associated cost of space-based Synthetic... more One method to dramatically reduce the weight, volume and associated cost of space-based Synthetic Aperture Radars (SAR) is to replace the conventional rigid manifold antenna architecture with a flexible thin-film membrane. This has been successfully demonstrated as a passive array. To further reduce the cost and weight and provide 2D scanning required by space-based applications we also need to integrate the Transmit/Receive (T/R) function into the inflatable antenna elements. This paper explores the constraints that must be placed on the active electronics of a flexible antenna array and preliminary work in this area.
Quantum entanglement has the potential to revolutionize the entire field of interferometric sensi... more Quantum entanglement has the potential to revolutionize the entire field of interferometric sensing by providing many orders of magnitude improvement in interferometer sensitivity. The quantum-entangled particle interferometer approach is very general and applies to many types of interferometers. In particular, without nonlocal entanglement, a generic classical interferometer has a statistical-sampling shot-noise limited sensitivity that scales like 1/ √ N , where N is the number of particles passing through the interferometer per unit time. However, if carefully prepared quantum correlations are engineered between the particles, then the interferometer sensitivity improves by a factor of √ N to scale like 1/N , which is the limit imposed by the Heisenberg Uncertainty Principle. For optical interferometers operating at milliwatts of optical power, this quantum sensitivity boost corresponds to an eight-order-of-magnitude improvement of signal to noise. This effect can translate into ...
High-power fiber lasers (HPFLs) would be made from photonic band gap (PBG) materials, according t... more High-power fiber lasers (HPFLs) would be made from photonic band gap (PBG) materials, according to the proposal. Such lasers would be scalable in the sense that a large number of fiber lasers could be arranged in an array or bundle and then operated in phase-locked condition to generate a superposition and highly directed high-power laser beam. It has been estimated that an average power level as high as 1,000 W per fiber could be achieved in such an array. Examples of potential applications for the proposed single-fiber lasers include welding and laser surgery. Additionally, the bundled fibers have applications in beaming power through free space for autonomous vehicles, laser weapons, free-space communications, and inducing photochemical reactions in large-scale industrial processes. The proposal has been inspired in part by recent improvements in the capabilities of single-mode fiber amplifiers and lasers to produce continuous high-power radiation. In particular, it has been foun...
27 much as the thermal-relaxation time for diffusion cooling is proportional to the square of the... more 27 much as the thermal-relaxation time for diffusion cooling is proportional to the square of the device length, the 100-nm-long devices should be capable of “raw” speeds of about 16 GHz. Since only a few gigahertz of bandwidth is needed for most mixer applications, it is expected that tantalum HEBs will be fast enough even in the presence of slowing effects of electrothermal feedback, which is present in most bolometer mixer circuits. This work was done by Anders Skalare, William McGrath, Bruce Bumble, and Henry LeDuc of Caltech for NASA’s Jet Propulsion Laboratory. Further information is contained in a TSP (see page 1). NPO-30695
Abstract. The microwave thermal thruster heats propellant via a heat-exchanger then expands it th... more Abstract. The microwave thermal thruster heats propellant via a heat-exchanger then expands it through a rocket nozzle to produce thrust. The heat-exchanger is simply a microwave-absorbent structure through which propellant flows in small channels. Nuclear thermal thrusters are based on an analogous principle, using neutrons rather than microwaves, and have experimentally demonstrated specific impulses exceeding 850 seconds. A microwave equivalent will likely have a similar specific impulse, since both nuclear and microwave thermal thrusters are ultimately constrained by material thermal limits, rather than the energy-density limits of chemical propellants. We present the microwave thermal thruster concept by characterizing a novel variation for beamed-energy launch. In reducing the thruster concept to practice, the enabling physical process is microwave absorption by refractory materials, and we examine semiconductor and susceptor-based approaches to achieving this absorption withi...
Optics InfoBase is the Optical Society's online library for flagship journals, partn... more Optics InfoBase is the Optical Society's online library for flagship journals, partnered and copublished journals, and recent proceedings from OSA conferences.
IEEE Transactions on Microwave Theory and Techniques, 2001
Applied Physics Letters, 1990
Superlattices of YBa2Cu3O7−x/YyPr1−yBa2Cu3O7−x(y=0.8 and 0.0) have been successfully grown insitu... more Superlattices of YBa2Cu3O7−x/YyPr1−yBa2Cu3O7−x(y=0.8 and 0.0) have been successfully grown insitu on MgO and LaAlO3 by using a multitarget pulsed laser deposition system. Satellite peaks have been observed in x-ray diffraction for the superlattices with modulation wavelengths from about few tens of angstroms to few hundred angstroms. The x-ray diffraction measurements also indicate that the multilayers have c axis normal to
A phase conjugation based method for full-duplex digi-tal communications is discussed. The method... more A phase conjugation based method for full-duplex digi-tal communications is discussed. The method uses a spa-tially confined and directive antenna pattern while a full-duplex digital communications link is maintained between moving platforms. The communications abilit ~ of the array is based on processing the phase associated with the mes-sage and the phase associated with the platform’s motion separately. Preliminary measurements at 6 GHz indicate that the phase conjugation method does allow simulators tracking and communications.
Abstract- A geosynchronous synthetic aperture radar (SAR) with an orbit inclination of 50–65 ° ca... more Abstract- A geosynchronous synthetic aperture radar (SAR) with an orbit inclination of 50–65 ° can provide daily coverage of all of North and South America. Longitudinally, the width of the mapped area would be on the order of ±50 ° at the Equator, somewhat more at the most northern/southern latitudes. Within the area mapped, very good temporal coverage can be obtained –up to several mappings during the 12 hours per day where the satellite is in the “right ” hemisphere. This would be a key capability in relation to disaster management, tectonic mapping and modeling, vegetation and soil moisture mapping, and for operational and semi-operational requirements. A constellation of geosynchronous satellites could provide global coverage. I. SCIENCE AND APPLICATIONS A geosynchronous SAR, with its fine temporal resolution, would overcome the limitations of current imaging systems,
Quantum entanglement has the potential to revolutionize the entire field of interferometric sensi... more Quantum entanglement has the potential to revolutionize the entire field of interferometric sensing by providing many Concepts of Physics, Vol. II (2005) 225orders of magnitude improvement in interferometer sensitivity. The quantum-entangled particle interferometer approach is very general and applies to many types of interferometers. In particular, without nonlocal entanglement, a generic classical interferometer has a statistical-sampling shot-noise limited sensitivity that scales like 1 / √ N, where N is the number of particles passing through the interferometer per unit time. However, if carefully prepared quantum correlations are engineered between the particles, then the interferometer sensitivity improves by a factor of √ N to scale like 1/N, which is the limit imposed by the Heisenberg Uncertainty Principle. For optical interferometers operating at milliwatts of
Quantum entanglement has the potential to revolutionize the entire field of interferometric sensi... more Quantum entanglement has the potential to revolutionize the entire field of interferometric sensing by providing many orders of magnitude improvement in interferometer sensitivity. The quantum entangled particle interferometer approach is very general and applies to many types of interferometers. In particular, without nonlocal entanglement, a generic classical interferometer has a statistical-sampling shot-noise limited sensitivity that scales like 1 / √ N,whereN is the number of particles passing through the interferometer per unit time. However, if carefully prepared quantum correlations are engineered between the particles, then the interferometer sensitivity improves by a factor of √ N to scale like 1/N, which is the limit imposed by the Heisenberg Uncertainty Principle. For optical interferometers operating at milliwatts of optical power, this quantum sensitivity boost corresponds to an eight-order-of-magnitude improvement of signal to noise. This effect can translate into a t...
A phase conjugation based method for full-duplex digital communications is discussed. The method ... more A phase conjugation based method for full-duplex digital communications is discussed. The method uses a spatially confined and directive antenna pattern while a fullduplex digital communications link is maintained between moving platforms. The communications abilit~ of the array is based on processing the phase associated with the message and the phase associated with the platform’s motion separately. Preliminary measurements at 6 GHz indicate that the phase conjugation method does allow simulators tracking and communications.
2002 9th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM], 2002
One method to dramatically reduce the weight, volume and associated cost of space-based Synthetic... more One method to dramatically reduce the weight, volume and associated cost of space-based Synthetic Aperture Radars (SAR) is to replace the conventional rigid manifold antenna architecture with a flexible thin-film membrane. This has been successfully demonstrated as a passive array. To further reduce the cost and weight and provide 2D scanning required by space-based applications we also need to integrate the Transmit/Receive (T/R) function into the inflatable antenna elements. This paper explores the constraints that must be placed on the active electronics of a flexible antenna array and preliminary work in this area.
Quantum entanglement has the potential to revolutionize the entire field of interferometric sensi... more Quantum entanglement has the potential to revolutionize the entire field of interferometric sensing by providing many orders of magnitude improvement in interferometer sensitivity. The quantum-entangled particle interferometer approach is very general and applies to many types of interferometers. In particular, without nonlocal entanglement, a generic classical interferometer has a statistical-sampling shot-noise limited sensitivity that scales like 1/ √ N , where N is the number of particles passing through the interferometer per unit time. However, if carefully prepared quantum correlations are engineered between the particles, then the interferometer sensitivity improves by a factor of √ N to scale like 1/N , which is the limit imposed by the Heisenberg Uncertainty Principle. For optical interferometers operating at milliwatts of optical power, this quantum sensitivity boost corresponds to an eight-order-of-magnitude improvement of signal to noise. This effect can translate into ...
High-power fiber lasers (HPFLs) would be made from photonic band gap (PBG) materials, according t... more High-power fiber lasers (HPFLs) would be made from photonic band gap (PBG) materials, according to the proposal. Such lasers would be scalable in the sense that a large number of fiber lasers could be arranged in an array or bundle and then operated in phase-locked condition to generate a superposition and highly directed high-power laser beam. It has been estimated that an average power level as high as 1,000 W per fiber could be achieved in such an array. Examples of potential applications for the proposed single-fiber lasers include welding and laser surgery. Additionally, the bundled fibers have applications in beaming power through free space for autonomous vehicles, laser weapons, free-space communications, and inducing photochemical reactions in large-scale industrial processes. The proposal has been inspired in part by recent improvements in the capabilities of single-mode fiber amplifiers and lasers to produce continuous high-power radiation. In particular, it has been foun...
27 much as the thermal-relaxation time for diffusion cooling is proportional to the square of the... more 27 much as the thermal-relaxation time for diffusion cooling is proportional to the square of the device length, the 100-nm-long devices should be capable of “raw” speeds of about 16 GHz. Since only a few gigahertz of bandwidth is needed for most mixer applications, it is expected that tantalum HEBs will be fast enough even in the presence of slowing effects of electrothermal feedback, which is present in most bolometer mixer circuits. This work was done by Anders Skalare, William McGrath, Bruce Bumble, and Henry LeDuc of Caltech for NASA’s Jet Propulsion Laboratory. Further information is contained in a TSP (see page 1). NPO-30695
Abstract. The microwave thermal thruster heats propellant via a heat-exchanger then expands it th... more Abstract. The microwave thermal thruster heats propellant via a heat-exchanger then expands it through a rocket nozzle to produce thrust. The heat-exchanger is simply a microwave-absorbent structure through which propellant flows in small channels. Nuclear thermal thrusters are based on an analogous principle, using neutrons rather than microwaves, and have experimentally demonstrated specific impulses exceeding 850 seconds. A microwave equivalent will likely have a similar specific impulse, since both nuclear and microwave thermal thrusters are ultimately constrained by material thermal limits, rather than the energy-density limits of chemical propellants. We present the microwave thermal thruster concept by characterizing a novel variation for beamed-energy launch. In reducing the thruster concept to practice, the enabling physical process is microwave absorption by refractory materials, and we examine semiconductor and susceptor-based approaches to achieving this absorption withi...
Optics InfoBase is the Optical Society's online library for flagship journals, partn... more Optics InfoBase is the Optical Society's online library for flagship journals, partnered and copublished journals, and recent proceedings from OSA conferences.