CUED Publications database

Density of photon states in dye-doped chiral nematic liquid crystal cells in the presence of losses and gain

Mavrogordatos, TK and Morris, SM and Castles, F and Hands, PJW and Ford, AD and Coles, HJ and Wilkinson, TD (2012) Density of photon states in dye-doped chiral nematic liquid crystal cells in the presence of losses and gain. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 86. ISSN 1539-3755

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Abstract

We calculate the density of photon states (DOS) of the normal modes in dye-doped chiral nematic liquid crystal (LC) cells in the presence of various loss mechanisms. Losses and gain are incorporated into the transmission characteristics through the introduction of a small imaginary part in the dielectric constant perpendicular and along the director, for which we assume no frequency dispersion. Theoretical results are presented on the DOS in the region of the photonic band gap for a range of values of the loss coefficient and different values of the optical anisotropy. The obtained values of the DOS at the photonic band gap edges predict a reversal of the dominant modes in the structure. Our results are found to be in good agreement with the experimentally obtained excitation thresholds in chiral nematic LC lasers. The behavior of the DOS is also discussed for amplifying LC cells providing additional insight to the lasing mechanism of these structures. © 2012 American Physical Society.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:29
Last Modified: 12 Dec 2014 19:03
DOI: 10.1103/PhysRevE.86.011705