  Orbital angular momentum is a fundamental degree of freedom of light that
manifests itself even at the single photon level. The coherent generation and
beaming of structured light usually requires bulky and slow components. Using
wave singularities known as bound states in continuum, we report an integrated
device that simultaneously generates and beams powerful coherent beams carrying
orbital angular momentum. The device brings unprecedented opportunities in the
manipulation of micro-particles and micro-organisms, and, will also find
applications in areas such as biological sensing, microscopy, astronomy, and,
high-capacity communications.
