We predict and present the first observation of conical diffraction arising from k-space singularities in the band-structure of a periodic potential. The experiments are carried out in honeycomb ...

A 3-octave spectral comb is generated in a hydrogen-filled hollow-core photonic-crystal-fiber. The spectrum consists of up to 45 high-order Stokes and anti-Stokes lines generated by coherent ...

Scientists have developed a metasurface that boosts light emission in 2D materials, paving the way for advanced flexible and energy-efficient display technologies.

A team of researchers has developed a novel method for using cholesteric liquid crystals in optical microcavities. The ...