photonics

Researchers working under Optica's ultrafast laser research report that new laser techniques can reveal how materials respond to light down to the level of individual electrons. The advance gives scientists a more direct view of the electron dynamics that underpin light-matter interactions, with potential relevance for photonics, electronics and materials science, though detailed findings remain limited in available coverage.

Researchers report that a quantum Hall insulator can be used to link resonators so that signals travel in only one direction, a property known as nonreciprocal transmission. The approach exploits the topological edge states characteristic of the quantum Hall effect, which could prove useful for routing signals in photonic or microwave circuits without backward reflections or interference.