Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2001-08-06
Phys. Rev. E, 65, 031717 (2002)
Physics
Condensed Matter
Soft Condensed Matter
15 pages and 7 figures. Submitted to PRE
Scientific paper
10.1103/PhysRevE.65.031717
This paper concerns optical properties of the isotropic phase above the isotropic-cholesteric transition and of the blue phase BP III. We introduce an effective index, which describes spatial dispersion effects such as optical rotation, circular dichroism, and the modification of the average index due to the fluctuations. We derive the wavelength dependance of these spatial dispersion effects quite generally without relying on an expansion in powers of the chirality and without assuming that the pitch of the cholesteric $P$ is much shorter than the wavelength of the light $\lambda$, an approximation which has been made in previous studies of this problem. The theoretical predictions are supported by comparing them with experimental spectra of the optical activity in the BP III phase.
Collings P. J.
Lacoste David
Lubensky Tom. C.
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