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.

Optics Express recently published research which have demonstrated a laser that is able to produce a new type of vector beam, as an extended work of the Optica's Jul. issue 2020 on-the-cover work ...