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Proceedings Paper

Spatial distribution of lasing at the edge of a photonic stop band in dye-doped cholesteric liquid crystals
Author(s): Victor I. Kopp; Zhao-Qing Zhang; Azriel Z. Genack
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Paper Abstract

We find a ring structure in the far field of laser radiation emitted from a dye-doped cholesteric liquid crystal (CLC) film. This is a consequence of angular confinement of radiation at the frequency of the mode propagating normal to the molecular layers, which lies closest to the reflection band edge. This is a result of the increase in frequency of the band edge with increasing angle from the normal, which places oblique radiation at the frequency of the band edge for normally propagating radiation inside the photonic gap. As a result, the intensity along the output surface of the film decays exponentially on a length scale that can be much larger than the film thickness. This in turn gives rise to a ring structure in the far field that is similar to Fraunhofer diffraction of a plane wave by an aperture. These results apply not only to CLC films but also to binary layered media.

Paper Details

Date Published: 19 May 2000
PDF: 10 pages
Proc. SPIE 3939, Organic Photonic Materials and Devices II, (19 May 2000); doi: 10.1117/12.386386
Show Author Affiliations
Victor I. Kopp, Chiral Photonics Inc. and CUNY/Queens College (United States)
Zhao-Qing Zhang, Hong Kong Univ. of Science and Technology (Hong Kong)
Azriel Z. Genack, Chiral Photonics Inc. and CUNY/Queens College (United States)


Published in SPIE Proceedings Vol. 3939:
Organic Photonic Materials and Devices II
Donal D. C. Bradley; Bernard Kippelen, Editor(s)

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