Chiral discrimination in helicity-preserving Fabry-Pérot cavities

We theoretically study circular dichroism of chiral molecules embedded inside a helicity-preserving Fabry-P\'erot cavity. find an increase the intrinsic chiroptical response by 2 orders magnitude and report first clear signature cavity polaritons upon entering regime strong light-matter coupling. design based on two dielectric photonic crystal mirrors acting, in narrow frequency range, as efficient polarization cross-converters transmission for one almost perfect reflectors other polarization. show that Pasteur medium hosted such can couple efficiently to both outside mode, inheriting enhanced character. expect device be useful future ultrasensitive sensors optics stereochemistry.