Bo Qiang

TL;DR: An electrically pumped terahertz quantum cascade laser based on topologically protected valley edge states based on the valley degree of freedom in a compact photonic crystal is demonstrated, bringing topological physics concepts closer to real-life applications.

TL;DR: A BIC-driven terahertz metasurface with dynamic control of high-Q silicon supercavities that are reconfigurable at a nanosecond timescale is experimentally demonstrated and revealed that such superc Cavities enable low-power, optically induced teraHertz switching and modulation of sharp resonances for potential applications in lasing, mode multiplexing, and biosensing.

TL;DR: It is argued that the findings are a substantial step towards infrared ultra-compact phonon polaritonic circuits and resonators, and would stimulate further investigations on nanophotonics in non-plasmonic atomically thin interface platforms.

TL;DR: Tunable highly confined surface phonon-polaritons are demonstrated in CMOS-compatible interfaces of nm-thick germanium on silicon carbide to demonstrate sensitivity of real-space polaritonic patterns for local detection of the interface composition change at sub-nanometer level.