@article {Huang:19, title = {Versatile total angular momentum generation using cascaded J-plates}, journal = {Opt. Express}, volume = {27}, number = {5}, year = {2019}, month = {Mar}, pages = {7469{\textendash}7484}, publisher = {OSA}, abstract = {Optical elements coupling the spin and orbital angular momentum (SAM/OAM) of light have found a range of applications in classical and quantum optics. The J-plate, with J referring to the photon\&\#x02019;s total angular momentum (TAM), is a metasurface device that imparts two arbitrary OAM states on an arbitrary orthogonal basis of spin states. We demonstrate that when these J-plates are cascaded in series, they can generate several single quantum number beams and versatile superpositions thereof. Moreover, in contrast to previous spin-orbit-converters, the output polarization states of cascaded J-plates are not constrained to be the conjugate of the input states. Cascaded J-plates are also demonstrated to produce vector vortex beams and complex structured light, providing new ways to control TAM states of light.}, keywords = {Atomic layer deposition, Circular polarization, Polarized light, Quantum optics, Vector beams, Vortex beams}, doi = {10.1364/OE.27.007469}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-27-5-7469}, author = {Yao-Wei Huang and Noah A. Rubin and Ambrosio, Antonio and Zhujun Shi and Robert C. Devlin and Cheng-Wei Qiu and Capasso, Federico} }