L. E. Hough and N. A. Clark (2005). Phys. Rev. Lett. 95, 107802 DOI: https://doi.org/10.1103/PhysRevLett.95.107802
We present a model for the optical chirality of layered liquid-crystalline phases. The model demonstrates that uniform stacking of chiral layers can lead to significant collective optical rotation, even in the absence of a superlayer helix. We predict the optical rotation of the B2 phases of bent-core liquid crystals, which can have optical rotation as large as 1000 times the molecular optical activity.