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Today, it is well known that light possesses a linear momentum which is alongthe propagation direction. Besides, scientists also discovered that light canpossess an angular momentum (AM), a spin angular momentum (SAM) associated withcircular polarization and an orbital angular momentum (OAM) owing to theazimuthally dependent phase. Even though such angular momenta are longitudinalin general, a SAM transverse to the propagation has opened up a variety of keyapplications [1]. In contrast, investigations of the transverse OAM are quiterare due to its complex nature. Here we demonstrate a simple method to generatea three dimensional (3D) optical wave packet with a controllable purelytransverse OAM. Such a wave packet is a spatiotemporal (ST) vortex, whichresembles an advancing cyclone, with optical energy flowing in the spatial andtemporal dimension. Contrary to the transverse SAM, the magnitude of thetransverse OAM carried by the photonic cyclone is scalable to a larger value bysimple adjustments. Since the ST vortex carries a controllable OAM in theunique transverse dimension, it has a strong potential for novel applicationsthat may not be possible otherwise. The scheme reported here can be readilyadapted for the other spectra regime and different wave fields, openingtremendous opportunities for the study and applications of ST vortex in muchbroader scopes.

Photonic Cyclone: spatiotemporal optical vortex with controllable transverse orbital angular momentum