title: Orbital angular momentum microlaser.
abstract: Structured light provides an additional degree of freedom for modern optics and practical applications. The effective generation of orbital angular momentum (OAM) lasing, especially at a micro- and nanoscale, could address the growing demand for information capacity. By exploiting the emerging non-Hermitian photonics design at an exceptional point, we demonstrate a microring laser producing a single-mode OAM vortex lasing with the ability to precisely define the topological charge of the OAM mode. The polarization associated with OAM lasing can be further manipulated on demand, creating a radially polarized vortex emission. Our OAM microlaser could find applications in the next generation of integrated optoelectronic devices for optical communications in both quantum and classical regimes.
authors.affiliation: Department of Electrical Engineering, The State University of New York at Buffalo, Buffalo, NY 14260, USA.
authors.forename: Pei
authors.initials: P
authors.lastname: Miao
authors.affiliation: Department of Electrical Engineering, The State University of New York at Buffalo, Buffalo, NY 14260, USA.
authors.forename: Zhifeng
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Department of Electrical Engineering, The State University of New York at Buffalo, Buffalo, NY 14260, USA.
authors.forename: Jingbo
authors.initials: J
authors.lastname: Sun
authors.affiliation: Department of Electrical Engineering, The State University of New York at Buffalo, Buffalo, NY 14260, USA.
authors.forename: Wiktor
authors.initials: W
authors.lastname: Walasik
authors.affiliation: Dipartimento di Fisica, Politecnico di Milano and Istituto di Fotonica e Nanotecnologie del Consiglio Nazionale delle Ricerche, Piazza L. da Vinci 32, Milano I-20133, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Longhi
authors.affiliation: Department of Electrical Engineering, The State University of New York at Buffalo, Buffalo, NY 14260, USA. fengl@buffalo.edu natashal@buffalo.edu.
authors.forename: Natalia M
authors.initials: NM
authors.lastname: Litchinitser
authors.affiliation: Department of Electrical Engineering, The State University of New York at Buffalo, Buffalo, NY 14260, USA. fengl@buffalo.edu natashal@buffalo.edu.
authors.forename: Liang
authors.initials: L
authors.lastname: Feng