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Negative resistivity of Si and Si<sub>0.9</sub>Ge<sub>0.1</sub> DDR IMPATT diode are numerically computed using double iterative method and modified Runge-Kutta method and results are compared for identical input parameters. Simulation is based on simultaneous solution of Poisson's equation, continuity equation and carrier diffusion equation in addition(More)
Novel band-reject filter is proposed using multilayer Bragg mirror structure by computing reflection coefficient at 1550 nm wavelength for optical communication. Dimension of different layers and material composition are modified to study the effect on rejection bandwidth, and no. of layers is also varied for analyzing passband characteristics. GaN/Al x Ga(More)
Effect of tunneling resistances and tunneling capacitances on the current-voltage characteristics of single electron transistor are analytically computed assuming source and drain ends are connected by quantum dot. Steady state master equation is solved by considering tunneling mechanism a stochastic process, and free energy changes are calculated as a(More)
— Bandpass filter characteristics is numerically computed for semiconductor heterostructure based one-dimensional photonic crystal at different optical wavelengths by varying the structural parameters taking GaAs/Al x Ga 1-x As as a suitable composition subject to normal incidence of electromagnetic wave. Transfer matrix technique is used for numerical(More)
Conductance, susceptance, reactance, quality factor and noise factor of Si<sub>09</sub>Ge<sub>01</sub> IMPATT diode are numerically computed using double iterative method and modified Runge-Kutta method when device is operated at millimeterwave frequency region. Poisson's equation, carrier diffusion equation and continuity equation are simultaneously solved(More)
Electromagnetic wave propagation inside one-dimensional photonic crystal fiber is numerically characterized by computing V-parameter, cladding index and effective mode profiles. Dependence on these parameters on geometrical structure of the fiber reflects the design tolerance, and corresponding modal characteristics. Air-hole spacing and periodicity are(More)
Intersubband transition energies of a semiconductor heterostructure quantum ring with cylindrical geometry are computed considering three lowest eigenstates. Band nonparabolicity is considered to observe the change in transition energy compared with parabolic band, as well as material composition of the heterostructure is varied taking AlxGa1-xAs as an(More)
Transmission coefficient, eigen states and tunneling current density of a potentially symmetric quantum double barrier structure has been numerically computed using transfer matrix technique for qualitative analysis of resonant tunneling probability when realistic band structure of higher band gap material is taken into account. GaAs/Al x Ga 1-x As material(More)
Photonic bandpass filter is designed at 1.55 &#x03BC;m using double negative refractive index material with air interface for use in optical communication system. Paired nanorod is considered as the DNG material for simulation, and wave propagation thorough the structure is considered along the direction of refractive index variation. Effect of oblique(More)
Lowest eigenenergy states of electrons in a semiconductor quantum ring with cylindrical geometry have been evaluated in the presence of external magnetic field, applied parallel to the plane of the quantum ring. Kinetic energy is modified by the appearance of a vector potential due to the magnetic field thus controlling the electron energy-eigenvalues(More)