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Multiple Bragg regimes exhibited by a chiral sculptured thin film half-space on axial excitation

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Axially excited chiral sculptured thin films (STFs) are shown to display the circular Bragg phenomenon in more than one wavelength-regime, owing to the dispersion inherent in their dielectric susceptibilities. With the assumption of the one-resonance Lorentz model for the constitutive parameters in a frequency-domain investigation, two Bragg regimes emerge: one pre-resonant, and the other post-resonant. A wavelength-regime of perfect reflection also appears. The pulse-bleeding mechanism previously shown to underlie the pre-resonant Bragg regime turns out to be responsible also for the post-resonant Bragg regime. Femtosecond pulse propagation in the post-resonant regime would be very likely affected by the existence of multiple Bragg and perfectly reflecting regimes.

Keywords: Bragg regime; Lorentz model; chiral thin film; circular Bragg phenomenon; femtosecond pulse; pulse propagation; sculptured thin film

Document Type: Original Article


Affiliations: 1: CATMAS – Computational and Theoretical Materials Sciences Group, Department of Engineering Science and Mechanics, 212 Earth-Engineering Sciences Building, Pennsylvania State University, University Park, PA 16802-6812, USA 2: Applied Science and Technology Graduate Group, University of California, Berkeley, CA 97420, USA

Publication date: 2002-08-01

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