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. 2021 Jan 29;12:689. doi: 10.1038/s41467-020-20845-2

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a The sample consists of a perylene crystal embedded in a microcavity. b Experimental setup allowing to obtain polarization-resolved complete state tomography. BS: beam splitter; L1–L4: lenses; M1: mirror. The red beam traces the optical path of the reflected light from the sample at a given angle. c Embedding the perylene crystal in a planar cavity combines TE-TM splitting βk², linear birefringence β₀, and emergent OA ζk_x. d Reflection of an empty cavity versus energy and wave vector, which evidences the k-dependent TE-TM splitting βk². e Reflection of a cavity filled with perylene, which is inducing linear birefringence β₀ on top of the cavity-induced TE-TM splitting, leading to emergent OA ζk_x (black arrows). Dashed lines show a fit of the two coupled bands with the Hamiltonian (4). The axes of the polarizer and the excitation direction k_x are aligned with the fast axis of the crystal. The figures are measured for a fixed angle range; white regions appear due to angle-to-wave vector conversion.