A Chiral Microcavity based on Apparent Circular Dichroism

08 June 2023, Version 1


Breaking the symmetry between left-handed and right-handed chiral optical modes 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, has remained underexplored and has been purported to require Faraday mirrors. We present a simple solution to chiral symmetry breaking in FP microcavities, preserving low mode volumes by embedding organic thin films exhibiting "apparent circular dichroism" (ACD); an optical phenomenon based on interfering linear birefringence and linear dichroism with offset optical axes. ACD interactions are opposite for counter-propagating light and increase with path length. Consequently, we demonstrated chiral asymmetry of the cavity modes over an order of magnitude larger than that of the isolated thin film. Through both circular dichroism spectroscopy and simulation using theoretical scattering matrix methods, we characterize the spatial, spectral, and angular chiroptical responses of this new type of chiral microcavity.


Supplementary materials

Supplementary Materials for A Chiral Microcavity based on Apparent Circular Dichroism
Section S1 CD degradation during microcavity fabrication Section S2 Microcavity Parameters and Finesse values Section S3 Discussion of Cavity Enhancement Section S4 Analysis of CD response of mechanically strained microcavity Section S5 Theoretical treatment of microcavity chiral response Section S6 Spatially- and temporally-resolved fluorescence measurements Section S7 Theoretical Ising model for spatially varying CD signal Section S8 Comparison with planar chirality in microcavity as demonstrated by Gautier et al


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