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Title: GaAs micro-pyramids serving as optical micro-cavities

An efficient light-matter coupling requires high-quality (Q) micro-cavities with small mode volume. We suggest GaAs micro-pyramids placed on top of AlAs/GaAs distributed Bragg reflectors to be promising candidates. The pyramids were fabricated by molecular-beam epitaxy, electron-beam lithography and a subsequent wet-chemical etching process using a sacrificial AlAs layer. Measured Q-factors of optical modes in single pyramids reach values up to 650. A finite-difference time-domain simulation assuming a simplified cone-shaped geometry suggests possible Q-factors up to 3600. To enhance the light confinement in the micro-pyramids we intend to overgrow the pyramidal facets with a Bragg mirror--results of preliminary tests are given.
Authors:
; ; ; ; ; ;  [1]
  1. Institut fuer Angewandte Physik and Center for Functional Nanostructures (CFN), Universitaet Karlsruhe (Thailand), Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe (Germany)
Publication Date:
OSTI Identifier:
21371409
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1199; Journal Issue: 1; Conference: 29. international conference on the physics of semiconductors, Rio de Janeiro (Brazil), 27 Jul - 1 Aug 2008; Other Information: DOI: 10.1063/1.3295456; (c) 2009 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM ARSENIDES; COMPUTERIZED SIMULATION; COUPLING; FINITE DIFFERENCE METHOD; GALLIUM ARSENIDES; INTERFACES; LAYERS; MIRRORS; MOLECULAR BEAM EPITAXY; OPTICAL MODES; PHOTOLUMINESCENCE; SEMICONDUCTOR MATERIALS; VISIBLE RADIATION ALUMINIUM COMPOUNDS; ARSENIC COMPOUNDS; ARSENIDES; CALCULATION METHODS; CRYSTAL GROWTH METHODS; ELECTROMAGNETIC RADIATION; EMISSION; EPITAXY; GALLIUM COMPOUNDS; ITERATIVE METHODS; LUMINESCENCE; MATERIALS; MATHEMATICAL SOLUTIONS; NUMERICAL SOLUTION; OSCILLATION MODES; PHOTON EMISSION; PNICTIDES; RADIATIONS; SIMULATION