Dynamic tuning of Bloch modes in anisotropic phonon polaritonic crystals.

ABSTRACT: Phonon polaritons, arising from the coupling of photons with lattice vibrations, enable light confinement on deeply subwavelength scales. Phonon polaritonic crystals (PoCs), leveraging these inherently low-dissipation excitations, have further shown exceptional potential for nanoscale light manipulation through engineered Bloch modes. Yet, their static nature has so far hindered dynamic modulation, thus limiting their adaptability for real-time applications. Here, we demonstrate in situ electrostatic control of low-loss anisotropic phonon-polaritonic Bloch modes in α-MoO₃ patterned into a periodic hole array with a graphene gate. Through theoretical calculation and real-space nano-imaging, we show that electrostatic gating dynamically modulates key characteristics of Bloch modes

SUBMITTER: Xu J 

PROVIDER: S-EPMC12764765 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature