physica status solidi (c)
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Editor: Stefan Hildebrandt (Editor-in-Chief)
Online ISSN: 1610-1642
Cover Picture: Phys. Status Solidi C 6/4
Quantum dots (QDs) are suitable candidates for the sensitive detection of infrared (IR) photons. A lithographic QD system utilizing intersubband excitation was proposed in the article by Zhenghua An et al. on p. 936 ff. The cover picture shows the principle of the device, where the QD is IR-active and can be charged by losing photo-excited electrons. The chemical potential drop of the QD thereby induces a persistent current change in the lower channel. This photo-transistor-like structure offers a built-in photo-amplification mechanism and leads to high sensitivities up to single photon level. The additional contact (C) provides new freedom for electrostatic control of the QD potential which may further improve the photo-response.
Current research interests of the first author Zhenghua An are QD based single photon detectors, the development of novel photo-coupling mechanisms for QD nano-devices, for example, plasmonic antennas based on subwavelength scale metal structures (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)