6 June 2018 Spectral and directional properties of elliptical quantum-dot microlasers
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We have fabricated microdisk lasers of colloidal quantum dots in circular and elliptical forms with different aspect ratios. By characterizing the laser emission spectrum under optical pumping and through mode simulation calculations, we demonstrate that the elliptical resonators can display two sets of whispering-gallery modes that interact to varying degrees depending on the aspect ratio. This causes significant mode splitting in the emission spectra when the mode interaction is at maximum. We also performed angular-dependent laser emission measurements for characterizing the emission pattern of the microlasers. We found that the emission pattern becomes less isotropic and more directional as the boundary deviates further from circular symmetry. In addition, we demonstrate that the emission directional properties of these microlasers can be further tailored by coupling pairs of elliptical microcavities together in different manners, where the long or short elliptical axis interacts most strongly.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Qingji Zeng, Qingji Zeng, Evan Lafalce, Evan Lafalce, Chun Hao Lin, Chun Hao Lin, Marcus J. Smith, Marcus J. Smith, Sidney T. Malak, Sidney T. Malak, Jaehan Jung, Jaehan Jung, Young Jun Yoon, Young Jun Yoon, Zhiqun Lin, Zhiqun Lin, Vladimir V. Tsukruk, Vladimir V. Tsukruk, Zeev Valy Vardeny, Zeev Valy Vardeny, } "Spectral and directional properties of elliptical quantum-dot microlasers," Journal of Photonics for Energy 8(3), 032218 (6 June 2018). https://doi.org/10.1117/1.JPE.8.032218 . Submission: Received: 23 January 2018; Accepted: 22 May 2018
Received: 23 January 2018; Accepted: 22 May 2018; Published: 6 June 2018

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