Small semiconductor lasers have attracted a wide interest in academia owing to their potential as highly integrated components in photonic circuits. Particularly, microdisk lasers exploiting whispering gallery modes have been regarded as a good candidate because of ultrasmall modal volume and low threshold property. To exploit large index difference between gain and surrounding medium, microdisk resonators with an underlying post using undercut etching have been proposed and widely investigated in many previous studies. However, it has been challenging in microdisk laser to operate single mode due to the large number of exsiting whispering gallery modes. Here, we propose and demonstrate a novel subwavelength scale microdisk laser. InGaAsP multi-quantum wells microdisk is self-suspended in air by connecting bridges. The behavior of TE-like whispering gallery modes, which belong to most dominant class of mode in thin disk configuration, is both numerically and experimentally investigated. We highlight that bridge does not only provide mechanical stability, but the number of bridges can be an important factor to improve or suppress wave confinement of whispering gallery modes by protecting or breaking spatial symmetry of mode. Moreover, a suitable choice of bridges increases quality factor by up to 79% comparing to the microdisk resonator without bridges. Using this scheme, we numerically and experimentally investigate mode selectivity and further demonstrate single mode microdisk lasers operating at near-infrared telecommunication wavelength.
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