Accession Number : ADP007820

Title :   Analysis and Assessment of Tilted Superlattices for Quantum Wire Laser Applications,

Corporate Author : CALIFORNIA UNIV SANTA BARBARA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING

Personal Author(s) : Yi, Jong Chang ; Dagil, Nadir ; Coldren, Larry

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Ultrafine submonolayer epitaxy on vicinal substrates 1 by molecular beam epitaxy MBE 2 or matalorganic chemical vapor deposition 3, 4 has been recently studied and developed extensively. By using this deposition mode, periodic lateral structures named tilted superlattices (TSL) have been successfully demonstrated 2, 3. Figure l(a) and (b) show the cross sectional TEM and schematic profiles of a TSL. A TSL is directly grown on an off axis or vicinal GaAs substrate by alternating deposition of two materials of different compositions. In the analysis two different methods are employed. One method reduces a single QWW into a modular electrical equivalent circuit by using a mode expansion in the solution of Schrodinger equation. Modularity of the equivalent circuit allows one to cascade the basic circuit to model an array of QWW. This approach allows one to analyze an array with different wires, hence the effects of imperfections, such as wire width fluctuations. The other method utilizes the finite element method (FEM) to solve the Schrodinger equation using periodic boundary conditions. So this method can analyze an infinite array of QWW and create the E-k diagram from which the density of state function can be directly obtained.

Descriptors :   APPROACH, ARRAYS, BOUNDARIES, CHEMICALS, CIRCUITS, DENSITY, DEPOSITION, DIAGRAMS, EQUATIONS, EQUIVALENT CIRCUITS, EXPANSION, FUNCTIONS, MATERIALS, MODELS, MOLECULAR BEAMS, PROFILES, SCHRODINGER EQUATION, STRUCTURES, SUBSTRATES, SUPERLATTICES, ULTRAFINES, VAPOR DEPOSITION, VAPORS, WIDTH, WIRE.

Subject Categories : Solid State Physics
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE