Topological bulk BICs in the vicinity of inverted photonic band edges enable an electrically pumped, compact, single-mode, and beam engineered QCL to be operated at terahertz region.

The other class of optical beams, vector states, were considered not possible to control holographically. With the new vector HOT, all states of light can now be used.

USTC generates arbitrary vector vortex beam using single q-plate Peer-Reviewed Publication. University of Science and Technology of China ...