Strong Coupling in a Self-Coupled Terahertz Photonic Crystal

Maria Kaeek, Ran Damari, Michal Roth, Sharly Fleischer, Tal Schwartz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Vibrational 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.

Original languageEnglish
Pages (from-to)1881-1888
Number of pages8
JournalACS Photonics
Issue number7
StatePublished - 21 Jul 2021


FundersFunder number
Israel Science Foundation2797/11, 1435/19, 926/18
Israel National Research Center for Electrochemical Propulsion


    • organic crystals
    • photonic crystal
    • resonant waveguide grating
    • self-hybridization
    • terahertz spectroscopy
    • vibrational strong coupling


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