ANALYSIS OF WAVE FUNCTION, ENERGY AND TRANSMISSION COEFFICIENTS IN GaN/ALGaN SUPERLATTICE NANOSTRUCTURES

Abstract

Abstract-Analysis of wave function intensity, eigen energy and transmission coefficients in GaN/AlGaN superlattice nanostructure has been carried out using Transfer Matrix Method (TMM). The effect of change in Aluminum mole fraction in Al x Ga 1−x N barrier region has been included through variable effective mass in the Schrödinger time independent equation. The behaviour of wave function intensity has been studied for superlattice structure by changing the barrier width. The effect of smaller barrier width on wave function intensity in case of superlattice is clearly observed due to interaction of wave functions in the adjacent wells and it provides a new insight in the nature of interacting wave functions for thin barriers in GaN/AlGaN superlattice structures. The barrier widths have been optimized for the varying number of wells leading to better quantum confinement. The iterative method (Secant Method) is used to determine value of electron energy E. The number of iterations need to converge the value of E has been simulated. Transmission coefficients have been determined as a function of energy E considering tunneling effect for three well structures using TMM. Analysis has been extended to show surface image of wave function intensity for 5 and 6 wells.

Accurate Determination of Gold Nanorods Concentrations From Optoacoustic Signals Detected at 870 Nm and 905 Nm by Using High-Power Diode Lasers With Fast Switching Electronics

“…However, their use for clinical applications is limited by their low repetition rates in the range of tens of Hz, the high cost and the bulky size that are mainly due to the power supply and cooling elements [8]. On the other hand, HPDLs [9][10][11] could be an alternative to overcome all these limitations of solid state lasers for OAI, due to their small size, low cost, availability in a wide range of near-infrared (NIR) wavelengths [12][13][14][15], and high repetition rates (kHz) for a fast signal acquisition [16,17]. Although HPDLs offer several advantages compared to other lasers, their output power is relatively low.…”

Analysis of the Optical Transmission Through the Metal Plate With Slit Array

“…The SPPs are electromagnetic surface waves that propagate along the metal-dielectric interface, and they are non-radiative [7]. Because the electromagnetic fields are localized and enhanced on the metal surface when the SPPs are excited, the SPPs have been widely applied in the sub-wavelength optics and plasmonics [8][9][10][11][12][13]. It is well known that the metal plates and films reflect and absorb the emitting light in ordinary light-emitting diodes (LEDs), but a metal plate with narrow slit array can be light-transparent by the excitation of the EOT in some wavelength regions.…”

Electronic Band Structure of Quantum Cascade Laser

“…Among the quantum structures, quantum well is extensively researched in the last decade because of computational advantages [16][17][18] and also eases of fabrication [19]. Multiple quantum well structures are subject to theoretical and experimental research in last two decades because of the resonant tunneling phenomenon [20], and novel photonic devices are already designed as transmiter [21] and receiver [22] applicable in nanoelectronic domain.…”

“…Result showed that remarkable reduction of spin relaxation time can be obtained (4-0.3 ns) when the quantum well structure is subjected under external electric ield applied along the direction of well width at room temperature. To understand the electronic and optical properties of the nanostructures, computation of their eigenstates is very essential along with density of states proile [16]. Among the quantum structures, quantum well is extensively researched in the last decade because of computational advantages [7,8,67] and also eases of fabrication [9].…”