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Silver Embedded Nanomesas as Enhanced Single Quantum Dot Emitters in the Telecommunication C Band

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Title: Silver Embedded Nanomesas as Enhanced Single Quantum Dot Emitters in the Telecommunication C Band
Authors: Huh, Jae-Hoon Browse this author
Hermannstädter, Claus Browse this author
Akahane, Kouichi Browse this author
Jahan, Nahid A. Browse this author
Sasaki, Masahide Browse this author
Suemune, Ikuo Browse this author →KAKEN DB
Issue Date: Jun-2012
Publisher: The Japan Society of Applied Physics
Journal Title: Japanese Journal of Applied Physics
Volume: 51
Start Page: 06FF12
Publisher DOI: 10.1143/JJAP.51.06FF12
Abstract: We use high-density InAs quantum dots, which were grown by molecular beam epitaxy on InP(311)B substrates, as photon sources in the telecommunication C band at approximately 1.55 µm. To select a small numbers of dots, we fabricate sub-micrometer sized mesas by electron beam lithography and reactive ion etching. The benefit of using high-density quantum dot samples is that at least one optically active quantum dot can be expected in every single mesa. We show that the etching rate and resulting mesa shape of the In0.53Al0.22Ga0.25As epitaxial layer can be varied with the chamber pressure during the etching process. Furthermore, under constant pressure and with increasing etching time, the sequential etching of the epitaxial layer and the underneath substrate leads to a significant modification in the mesa shape, too. We demonstrate that the isolation of a small number of quantum dots within one mesa results in the appearance of single quantum dot emission with a narrow line width and minimal spectral overlap between different emission lines. We moreover present significant enhancement of the luminescence collected from single dots in silver-embedded nanomesas when compared with as-etched mesas.
Rights: © 2012 The Japan Society of Applied Physics
Type: article (author version)
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 末宗 幾夫

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