Nanoscale Materials and Devices for Future
... Direct integration of an assortment of semiconductor nanostructures in devices and circuits on single crystal surfaces offers attractive opportunities in several areas of high-performance communication electronics, optoelectronics, sensing, energy conversion, and imaging. Beyond these applications, ...
... Direct integration of an assortment of semiconductor nanostructures in devices and circuits on single crystal surfaces offers attractive opportunities in several areas of high-performance communication electronics, optoelectronics, sensing, energy conversion, and imaging. Beyond these applications, ...
Statistical measurements of quantum emitters coupled to Anderson
... The local environment of a quantum emitter determines its spectral and spatial emission properties. Within the dipole approximation, the emission dynamics of an emitter is directly determined by the local density of optical states (LDOS) [1], which accounts for the density of vacuum fluctuation at t ...
... The local environment of a quantum emitter determines its spectral and spatial emission properties. Within the dipole approximation, the emission dynamics of an emitter is directly determined by the local density of optical states (LDOS) [1], which accounts for the density of vacuum fluctuation at t ...
Ultrafast electronic dynamics in polyatomic molecules studied using
... The laser pulses finally enter a high-vacuum optics chamber that houses an optical delay stage and mirrors. A UV-enhanced aluminium mirror with an aperture of 3 mm diameter is used to spatially separate the central and peripheral parts of the beam. The central part is transmitted through this holed ...
... The laser pulses finally enter a high-vacuum optics chamber that houses an optical delay stage and mirrors. A UV-enhanced aluminium mirror with an aperture of 3 mm diameter is used to spatially separate the central and peripheral parts of the beam. The central part is transmitted through this holed ...
Observation of Collective Friction Forces due to Spatial Self
... corresponds to 33 photon recoils per atom, which is much larger than the average number of five photons necessary to depump the atoms to the Fg 3 dark ground state. This implies that, due to the large cavity-to-free-space scattering ratio 2c , the momentum change p per atom can far exceed the im ...
... corresponds to 33 photon recoils per atom, which is much larger than the average number of five photons necessary to depump the atoms to the Fg 3 dark ground state. This implies that, due to the large cavity-to-free-space scattering ratio 2c , the momentum change p per atom can far exceed the im ...
Optical and evaporative cooling of cesium atoms in the gravito
... volume which allows for a transfer of a large number of atoms into the GOST. Due to the accurate focussing of the hollow laser beam into a ring-shaped intensity profile [12], the shape of the potential is box-like along the horizontal directions whereas the combination of gravity and the repulsive w ...
... volume which allows for a transfer of a large number of atoms into the GOST. Due to the accurate focussing of the hollow laser beam into a ring-shaped intensity profile [12], the shape of the potential is box-like along the horizontal directions whereas the combination of gravity and the repulsive w ...
M. Tech in Optoelectronics and Laser Technology
... Approved by joint Board of Studies in Electronics & Physics on 27th April 2012 ...
... Approved by joint Board of Studies in Electronics & Physics on 27th April 2012 ...
Chirped amplitude modulation ladar for range and
... detected by the distributed aperture system (DAS) IRST system being developed by the Naval Research Laboratory (NRL) sponsored by the Office of Naval Research (ONR). By using the ladar's range and velocity data, false alarms and clutter objects will be distinguished from incoming missiles. Because t ...
... detected by the distributed aperture system (DAS) IRST system being developed by the Naval Research Laboratory (NRL) sponsored by the Office of Naval Research (ONR). By using the ladar's range and velocity data, false alarms and clutter objects will be distinguished from incoming missiles. Because t ...
Nondegenerate optical Kerr effect in semiconductors
... independent for most semiconductors [9]. In the TPB approximation, this parameter is related to the electron (or hole) effective mass me ( = mv) through ...
... independent for most semiconductors [9]. In the TPB approximation, this parameter is related to the electron (or hole) effective mass me ( = mv) through ...
Manipulating Atoms with Photons
... corresponding to the selection rule Me − Mg = 1 associated to a σ+ -excitation (see § 2.1). Once the atom has been excited in e+1/2 , it can fall back by spontaneous emission either in g−1/2 , in which case it can repeat the same cycle, or in g+1/2 by emission of a πpolarized photon. In the last cas ...
... corresponding to the selection rule Me − Mg = 1 associated to a σ+ -excitation (see § 2.1). Once the atom has been excited in e+1/2 , it can fall back by spontaneous emission either in g−1/2 , in which case it can repeat the same cycle, or in g+1/2 by emission of a πpolarized photon. In the last cas ...
The Fabry-Pérot Interferometer
... Slightly divergent monochromatic light enters the two glass plates in Fig. 2. Their four surfaces are very plane, the inner ones are parallel to each other and highly reflecting. To guide reflections from the outer faces away, the glass plates are wedged at 0.5◦ . The interference of light from the ...
... Slightly divergent monochromatic light enters the two glass plates in Fig. 2. Their four surfaces are very plane, the inner ones are parallel to each other and highly reflecting. To guide reflections from the outer faces away, the glass plates are wedged at 0.5◦ . The interference of light from the ...
Photonic laser thruster
A photonic laser thruster is an amplified laser thruster that generates thrust directly from the laser photon momentum, rather than laser-heating propellant. The concept of single-bounce laser-pushed lightsails that utilize the photon momentum was first developed in the 1960s, however, its conversion of laser power to thrust is highly inefficient, thus has been considered impractical. Over 50 years, there had been numerous theoretical and experimental efforts to increase the conversion efficiency by recycling photons, bouncing them repetitively between two reflective mirrors in an empty optical cavity, without success. In December 2006, Young Bae successfully solved this problem and demonstrated the conversion efficiency enhancement by a factor of 100 and a photon thrust of 35 micronewtons by putting the laser energizing media between the two mirrors as in typical lasers, and the photonic laser thruster was born. In August 2015, the photonic laser thruster was demonstrated to increase the conversion efficiency enhancement by a factor over 1,000 and to achieve a photon thrust of 3.5 millinewtons at Y.K. Bae Corporation. In addition, Propelling, slowing and stopping of a small satellite, 1U CubeSat, in simulated zero-gravity were demonstrated. The photonic laser thruster was initially developed for use in nanometer precision spacecraft formation, for forming ultralarge space telescopes and radars. The photonic laser thruster is currently developed for high-precision and high-speed maneuver of small spacecraft, such as formation flying, orbit adjustments, drag compensation, and rendezvous and docking. The photonic laser thruster can be used for beaming thrust from a conventional heavy resource vehicle to a more expensive & lightweight mission vehicle, similar to tankers in aerial refueling.The practical usage of the photonic laser thruster for main space propulsion would require extremely high laser powers and overcoming technological challenges in achieving the laser power and fabricating the required optics. Photonic laser thrusters have a very high specific impulse, and can permit spacecraft reach much higher speeds than with conventional rockets, which are limited by the Tsiolkovsky rocket equation. If the photonic laser thruster is scalable for the use in such main space propulsion, multiple photonic laser thrusters can be used to construct a 'photonic railway' that has been proposed as a potential permanent transport infrastructure for interplanetary or interstellar commutes, allowing the transport craft themselves to carry very little fuel.