Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-05-30
Physica status solidi (b) Vol. 245, pp. 1076-1080 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 5 figures
Scientific paper
10.1002/pssb.200777621
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 ueV 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.
Byrnes Tim
Deng Hui
Fraser Michael
Fujisawa Toshimasa
Kim Na Young
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