A 2D chiral microcavity based on apparent circular dichroism

Tzu-Ling Chen, Andrew Salij, Katherine A. Parrish, Julia K. Rasch, Francesco Zinna, Paige J. Brown, Gennaro Pescitelli, Francesco Urraci, Laura A. Aronica, Abitha Dhavamani, Michael S. Arnold, Michael R. Wasielewski, Lorenzo Bari, Roel Tempelaar () and Randall H. Goldsmith ()
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Tzu-Ling Chen: University of Wisconsin-Madison
Andrew Salij: Northwestern University
Katherine A. Parrish: University of Wisconsin-Madison
Julia K. Rasch: University of Wisconsin-Madison
Francesco Zinna: Università di Pisa
Paige J. Brown: Northwestern University
Gennaro Pescitelli: Università di Pisa
Francesco Urraci: Università di Pisa
Laura A. Aronica: Università di Pisa
Abitha Dhavamani: University of Wisconsin-Madison
Michael S. Arnold: University of Wisconsin-Madison
Michael R. Wasielewski: Northwestern University
Lorenzo Bari: Università di Pisa
Roel Tempelaar: Northwestern University
Randall H. Goldsmith: University of Wisconsin-Madison

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Engineering asymmetric transmission between left-handed and right-handed circularly polarized light in planar Fabry–Pérot (FP) microcavities would enable a variety of chiral light-matter phenomena, with applications in spintronics, polaritonics, and chiral lasing. Such symmetry breaking, however, generally requires Faraday rotators or nanofabricated polarization-preserving mirrors. We present a simple solution requiring no nanofabrication to induce asymmetric transmission in FP microcavities, preserving low mode volumes by embedding organic thin films exhibiting apparent circular dichroism (ACD); an optical phenomenon based on 2D chirality. Importantly, ACD interactions are opposite for counter-propagating light. Consequently, we demonstrated asymmetric transmission of cavity modes over an order of magnitude larger than that of the isolated thin film. Through circular dichroism spectroscopy, Mueller matrix ellipsometry, and simulation using theoretical scattering matrix methods, we characterize the spatial, spectral, and angular chiroptical responses of this 2D chiral microcavity.

Date: 2024
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DOI: 10.1038/s41467-024-47411-4

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