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

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Title
Phonon-Polaritons in Lead Halide Perovskite Film Hybridized with THz Metamaterials
Author
Kim, Hwan SikHa, Na YoungPark, Ji-YongLee, SoonilKim, Dai-SikAhn, Yeong Hwan
Issue Date
2020-09
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.20, no.9, pp.6690 - 6696
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.
URI
https://scholarworks.unist.ac.kr/handle/201301/49118
URL
https://pubs.acs.org/doi/10.1021/acs.nanolett.0c02572
DOI
10.1021/acs.nanolett.0c02577
ISSN
1530-6984
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PHY_Journal Papers
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