Nanowerk December 8, 2024
Photonic time crystals consist of materials with uniform composition in space, but properties that vary periodically over time which allows the modulation of the spectral composition of light, and amplification as needed. It is on high demand for current, and possibly also future materials platforms because their small modulation strength. An international team of researchers (Germany, Finland) demonstrated that by introducing temporal variations in a resonant material, the momentum bandgap could be drastically expanded with modulation strengths with known low-loss materials and realistic laser pump powers. The resonance could emerge from an intrinsic material resonance or a suitably spatially structured material supporting a structural resonance. According to the researchers their concept is validated for resonant bulk media and optical metasurfaces and paves the way towards the first experimental realizations of photonic time crystals… read more. Open Access TECHNICAL ARTICLE
Conceptual realization method of time-varying medium with resonance frequency modulated. Credit: Nature Photonics, 12 November 2024