Controlling the electro-optic response of a semiconducting perovskite coupled to a phonon-resonant cavity
Reference:
Di Virgilio, L., Geuchies, J.J., Kim, H., Krewer, K., Wang, H., Grechko, M. and Bonn, M., 2023. Controlling the electro-optic response of a semiconducting perovskite coupled to a phonon-resonant cavity. arXiv preprint arXiv:2306.05000.
PI-KEM Product referenced:
2mm thick silica wafers
Abstract:
Optical cavities, resonant with vibrational or electronic transitions of material within the cavity, enable control of light-matter interaction. Previous studies have reported cavity-induced modifications of chemical reactivity, fluorescence, phase behavior, and charge transport. Here, we explore the effect of resonant cavity phonon coupling on the transient photoconductivity in a hybrid organic-inorganic perovskite. To this end, we measure the ultrafast photoconductivity response of perovskite in a tunable Fabry–Pérot terahertz cavity, designed to be transparent for optical excitation. The terahertz-cavity field-phonon interaction causes apparent Rabi splitting between the perovskite phonon mode and the cavity mode. We explore whether the cavity-phonon interaction affects the material’s electronphonon interaction by determining the charge carrier mobility through the photoconductivity. Despite the apparent hybridization of cavity and phonon modes, we show that the perovskite properties, in both ground (phonon response) and excited (photoconductive response) states, remain unaffected by the tunable light-matter interaction. Yet the response of the integral perovskite-terahertz optical cavity system depends critically on the interaction strength of the cavity with the phonon: the transient terahertz response to optical excitation can be increased up to 3-fold by tuning the cavity-perovskite interaction strength. These results enable tunable switches and frequency-controlled induced transparency devices
Keywords
Perovskites, Optical devices, Photoconductivity, Fabry-Perot, Terrahertz- cavity, Phonon
Authors:
Lucia Di Virgilio1, Jaco J. Geuchies1, Heejae Kim1, 2, Keno Krewer1, Hai Wang1, Maksim Grechko1*,Mischa Bonn1*
Organisation / Department Address:
1 Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
2 Pohang University of Science and Technology, Department of Physics, 37673 Pohang, Korea.
*Correspondence to: grechko@mpip-mainz.mpg.de, bonn@mpip-mainz.mpg.de
