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A linearly polarized coherent ultraviolet (UV) or deep UV light source is required for biochemical, medical, and other industrial applications. Current planar GaN-based UV lasers have threshold currents ∼10 kA/cm2 or higher. A polariton laser is an inversionless coherent light source operating in the strong coupling regime of light-matter interaction [1]. Exciton-polariton lasers have been realized...
III-nitride nanowires and disk-in-nanowire heterostructures grown on silicon substrates have been used to realize light emitting diodes (LEDs) [1, 2] and diode lasers [3, 4]. We have recently demonstrated edge-emitting disk-in-nanowire diode lasers, in which the gain region consists of multiple InxGa1−xN (0.3≤×≤0.85)/GaN disks and the emission wavelength varied in the range of 0.53 to 1.2 μm [4]....
Room temperature electrical modulation response of a bulk GaN-based electrically injected polariton laser is reported. The frequency response is derived from the measured time-resolved electroluminescence and a maximum −3dB bandwidth of 0.65 GHz is obtained.
When an emitter is placed in a resonant cavity, then in the strong coupling regime of light-matter interaction the degeneracy between the emitter and cavity photon is lifted, giving rise to two light-matter entangled eigenstates separated by a characteristic interaction energy (Rabi splitting) ΩVRS. These are the lower and upper exciton-polariton branches, which are the normal modes of the system...
The characteristics of 1.55 InAs self-organized quantum-dot lasers, grown on (001) InP substrates by molecular beam epitaxy, have been investigated. Modulation doping of the dots with holes and tunnel injection of electrons have been incorporated in the design of the active (gain) region of the laser heterostructure. Large values of ...
This paper illustrates a secure and reliable system for remotely controlling electrical appliances by Short Messaging Service (SMS) and/or internet. The system requires serial interfacing of two micro-controllers with SIEMENS AX75 cell phone and a personal computer respectively. A microcontroller unit was used to merge the independent subsystems for SMS and internet based control. The micro-controllers...
Capacitance-Voltage (C-V) characteristics of Tri-Gate (TG) and Double Gate (DG) Silicon-on-Insulator (SOI) FinFETs having sub 10 nm dimensions are obtained by self consistent method using coupled Schrodinger-Poisson solver taking into account quantum mechanical effects. Though self-consistent simulation to determine current and other short channel effects in these devices have been demonstrated in...
The looming energy crisis, heightened by the continuing depletion of fossil fuels, accentuates the need for deployment of renewable energy resources in Bangladesh, now more than ever before. Though hydrocarbon resources in the country are limited, the substantial availability of renewable energy sources in the form of solar, biomass, hydropower and wind energy offers opportunities of sustainable energy...
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