ph1c00309_si_001.pdf (1.09 MB)
Strong Coupling in a Self-Coupled Terahertz Photonic Crystal
journal contribution
posted on 2021-06-17, 15:03 authored by Maria Kaeek, Ran Damari, Michal Roth, Sharly Fleischer, Tal SchwartzVibrational strong
coupling is a phenomenon in which a vibrational
transition in a material placed inside a photonic structure is hybridized
with its optical modes to form composite light–matter excitations
known as vibro-polaritons. Here we demonstrate a new concept of vibrational
strong coupling: we show that a monolithic photonic crystal, made
of a resonant material, can exhibit strong coupling between the optical
modes confined in the structure and the terahertz vibrational excitations
of the same material. We study this system both experimentally and
numerically to characterize the dispersion of the photonic modes for
various sample thicknesses and reveal their coupling with the vibrational
resonances. Finally, our time-domain THz measurements allow us to
isolate the free induction decay signal from the grating modes as
well as from the vibro-polaritons.