Intrinsic Radial Landau Rainbow in Triaxial Strained Photonic Crystal

Abstract

Localized resonances are essential for enhancing light matter interaction, controlling emission, and realizing compact optical resonators and lasers. Landau levels offer a distinct route to organizing photonic states through synthetic magnetic fields, but their high degeneracy does not define spectrally separated localized resonances. Here, we report the intrinsic lifting of degeneracy in photonic Landau levels in a triaxially strained photonic crystal, leading to the emergence of an intrinsic radial Landau rainbow. The triaxial deformation generates photonic Landau levels through a strain induced pseudomagnetic field, while an accompanying pseudoelectric field lifts the degeneracy of the Landau levels. As a result, each Landau level splits into an equally spaced frequency ladder of localized resonances. In zeroth Landau level, these modes exhibit intensity maxima that move progressively outward from the device center, establishing a radial frequency position mapping and Landau rainbow. Our results reveal an intrinsic fine structure of photonic Landau levels in a triaxial strained photonic crystal and provide a route to spatially ordered Landau level resonances.