Lasing in submonolayer InAs/AlGaAs structures without external optical confinement
B. V. VolovikA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgA. F. Tsatsul’nikovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgN. N. LedentsovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgМ. В. МаксимовA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgA. V. SakharovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgA. Yu. EgorovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgA. E. ZhukovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgA. R. KovshA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgV. M. UstinovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgP. S. Kop’evInsitut für Festkörperphysik, Technische Universität Berlin, Berlin, GermanyZh. I. AlfërovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgI. É. KozinA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgM. V. BelousovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgD. BimbergA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg
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Structures having a set of planes with submonolayer InAs inclusions in an AlGaAs matrix were fabricated and studied. Lasing was observed as a result of optical excitation. It is shown that lasing takes place via the ground state of excitons localized at InAs islands and may be achieved without external optical confinement of the active region by wide-gap layers of lower refractive index. The low threshold excitation density shows that these structures may be used to develop low-threshold injection lasers in the visible range, exciton waveguides, and self-contained microcavities.
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