Tunable topological charge vortex microlaser

Zhang,Zhifeng; Qiao, Xingdu; Midya, Bikashkali ; Liu, Kevin; Sun, Jingbo ; Wu, Tianwei ; Liu, Wenjing ; Agarwal, Ritesh ; Jornet, Josep Miquel; Longhi, Stefano; Litchinitser, Natalia M; Feng, Liang
Science 368, 760-763 (2020)

The orbital angular momentum (OAM) intrinsically carried by vortex light beams holds a promise for multidimensional high-capacity data multiplexing, meeting the ever-increasing demands for information. Development of a dynamically tunable OAM light source is a critical step in the realization of OAM modulation and multiplexing. By harnessing the properties of total momentum conservation, spin-orbit interaction, and optical non-Hermitian symmetry breaking, we demonstrate an OAM-tunable vortex microlaser, providing chiral light states of variable topological charges at a single telecommunication wavelength. The scheme of the non–Hermitian-controlled chiral light emission at room temperature can be further scaled up for simultaneous multivortex emissions in a flexible manner. Our work provides a route for the development of the next generation of multidimensional OAM-spin-wavelength division multiplexing technology.

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