Propagating Bloch bound states with orbital angular momentum above the light line in the array of dielectric spheres

Bulgakov, Evgeny N.; Sadreev, Almas F. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, 34 (6):949-952; Doi: 10.1364/JOSAA.34.000949 JUN 1 2017

We present propagating Bloch bound states in the radiation continuum with orbital angular momentum in an infinite linear periodical array of dielectric spheres. The bound states in the continuum demonstrate a giant Poynting vector spiraling around the array. They can be excited by a plane wave with incident linear polarization with a small tilt relative to the axis of the array.