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GaAs microcavity exciton‐polaritons in a trap
Author(s) -
Kim Na Young,
Lai ChihWei,
Utsunomiya Shoko,
Roumpos Georgios,
Fraser Michael,
Deng Hui,
Byrnes Tim,
Recher Patrik,
Kumada Norio,
Fujisawa Toshimasa,
Yamamoto Yoshihisa
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200777610
Subject(s) - exciton , exciton polaritons , polariton , quantum well , semiconductor , optoelectronics , materials science , resonance (particle physics) , aperture (computer memory) , amplitude , electric field , metal , photon , condensed matter physics , grating , plane (geometry) , optics , molecular physics , atomic physics , physics , laser , quantum mechanics , acoustics , metallurgy , geometry , mathematics
We present a simple method to create an in‐plane lateral potential in a semiconductor microcavity using a metal thin‐film. Two types of potential are produced: a circular aperture and a one‐dimensional (1D) periodic grating pattern. The amplitude of the potential induced by a 24 nm – 6 nm Au/Ti film is on the order of a few hundreds of μeV measured at 6–8 K. Since the metal layer makes the electromagnetic fields to be close to zero at the metal–semiconductor interface, the photon mode is confined more inside of the cavity. As a consequence, the effective cavity length is reduced under the metal film, and the corresponding cavity resonance is blue‐shifted. Our experimental results are in a good agreement with theoretical estimates. In addition, by applying a DC electric voltage to the metal film, we are able to modify the quantum well exciton mode due to the quantum confined Stark effect, inducing a ∼1 meV potential at ∼20 kV/cm. Our method produces a controllable in‐plane spatial trap potential for lower exciton‐polaritons (LPs), which can be a building block towards 1D arrays and 2D lattices of LP condensates. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)