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7 March 2022 Optically induced coherent phonons in bismuth oxyiodide (BiOI) nanoplatelets
Sebastian Rieger, Tim Fürmann, Jacek K. Stolarczyk, Jochen Feldmann
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Proceedings Volume PC11999, Ultrafast Phenomena and Nanophotonics XXVI; PC119990J (2022) https://doi.org/10.1117/12.2609552
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
Bismuth oxyiodide (BiOI) is a promising material for photocatalysis with intriguing optical and structural properties. We demonstrate that excitation by a femtosecond laser pulse creates coherent phonons inducing a time-variant oscillating modulation of the optical density. The two underlying frequencies originate from vibrations along the stacking direction of oppositely charged layers in BiOI. This is consistent with a subpicosecond charge separation driven by a built-in dipolar field. This partially screens the field, launching coherent phonons. Our results demonstrate the presence of an electric field and show its role in efficient charge separation that is crucial for photocatalytic applications of BiOI.
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Sebastian Rieger, Tim Fürmann, Jacek K. Stolarczyk, and Jochen Feldmann "Optically induced coherent phonons in bismuth oxyiodide (BiOI) nanoplatelets", Proc. SPIE PC11999, Ultrafast Phenomena and Nanophotonics XXVI, PC119990J (7 March 2022); https://doi.org/10.1117/12.2609552
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KEYWORDS
Phonons
Bismuth
Crystals
Acoustics
Carrier dynamics
Coherence (optics)
Femtosecond phenomena
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