Tunable Orbital Angular Momentum Radiation from Angular-Momentum-Biased Microcavities

Adam Mock, Dimitrios Sounas, Andrea Alù

Research output: Contribution to journalArticlepeer-review


Lasers and light emitters do not typically radiate fields with orbital angular momentum (OAM). Here we show that a suitable scheme of spatiotemporal modulation of a microring cavity laser can impart a synthetic angular momentum, resulting in beams with well-defined OAM. The phenomenon relies on a traveling wave modulation of the refractive index of the microring, which breaks the degeneracy of oppositely oriented whispering gallery modes. In parallel, a static structural grating on the periphery of the microring enables efficient vertical radiation. The proposed structure is inherently tunable and can also emit fields with zero net OAM while retaining toroidal energy distributions similar to the effect of an axicon lens.

Original languageEnglish
Article number103901
JournalPhysical Review Letters
Issue number10
StatePublished - Sep 4 2018


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