Phonon-Polaritons in Lead Halide Perovskite Film Hybridized with THz Metamaterials

Abstract

In this work, we demonstrated a phonon-polariton in the terahertz (THz) frequency range, generated in a crystallized lead halide perovskite film coated on metamaterials. When the metamaterial resonance was in tune with the phonon resonance of the perovskite film, Rabi splitting occurred due to the strong coupling between the resonances. The Rabi splitting energy was about 1.1 meV, which is larger than the metamaterial and phonon resonance line widths; the interaction potential estimation confirmed that the strong coupling regime was reached successfully. We were able to tune the polaritonic branches by varying the metamaterial resonance, thereby obtaining the dispersion curve with a clear anticrossing behavior. Additionally, we performed in situ THz spectroscopy as we annealed the perovskite film and studied the Rabi splitting as a function of the films’ crystallization coverage. The Rabi splitting versus crystallization volume fraction exhibited a unique power-law scaling, depending on the crystal growth dimensions.

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“…Terahertz (THz) spectroscopy has been widely adopted as a powerful tool for biomedical diagnosis, device inspection, and characterization of novel functional materials [1][2][3][4][5][6]. THz waves are transparent to nonconductive materials frequently used for the encapsulation of devices such as semiconducting chips; therefore, THz imaging allows us to characterize the internal structures of objects in a nondestructive manner [7][8][9][10][11][12][13][14][15][16][17].…”

Detection of Polystyrene Microplastic Particles in Water Using Surface-Functionalized Terahertz Microfluidic Metamaterials

“…We monitored the change in the resonant frequency of the metamaterials with in situ THz spectroscopy while injecting the PS solution into the fluidic device. The transmission amplitudes of THz metamaterial devices were obtained from a conventional in situ THz time-domain spectroscopy system with an acquisition time of 4 s as described elsewhere [38,39].…”

Tunable terahertz band-stop filter using strongly coupled split ring resonators integrated with on-chip waveguide

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