Obraztsova A. A.1, Pivovarova A. A. 2, . Komarov S. D.1, Fedosov I. S. 1, Ivanov K. A. 1, Kalyuzhnyy N. A. 2, Mintairov S. A. 2, Il’inskaya N. D. 2, Yakovlev Yu. P. 2, Makhov I. S. 1, Kryzhanovskaya N. V. 1, Zhukov A. E. 1
1HSE University, St. Petersburg, Russia
2Ioffe Institute, St. Petersburg, Russia
Email: aobraztsova@hse.ru
This work presents an approach to the fabrication of quantum dot microlasers on GaAs substrates featuring a disk-shaped cavity, a bridge-type electrical contact and a supporting mesa formed by wet chemical etching. The bridge structure consists of two mesa structures connected by a suspended gold beam, one of which is actually a microdisk cavity, and the other allows to create an external electrical contact. The proposed method opens up ways to fabricate small-diameter injection microlasers, as it obviates the need for wire bonding to the top surface of the microlaser cavity. Microlasers with a bridge electrical contact were fabricated, the formation of a close-to-vertical microcavity side-wall in the active region of the structure was demonstrated and the electroluminescence spectra of the microlasers were obtained in a wide range of pump currents, confirming the possibility of lasing both at room and elevated temperatures. Keywords: microlasers, bridge contact, whispering gallery modes, wet chemical etching.
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