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Proceedings Paper

Excitations in opal photonic crystals infiltrated with polarizable media
Author(s): Nayer Eradat; A. Yu Sivachenko; Mikhail E. Raikh; Z. Valy Vardeny; Anvar A. Zakhidov; S. Li; Ray Henry Baughman
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Paper Abstract

Photonic crystals (PC) are a class of artificial structures with a periodic dielectric function. PCs can be a laboratory for testing fundamental processes involving interactions of radiation with matter in novel conditions. We have studied the optical properties of opal PCs that are infiltrated with highly polarizable media such as j-aggregates of cyanine dyes. Opals are self-assembled structures of silica spheres. We report our studies on clarifying the relationship between a polaritonic gap and a photonic stop band (Bragg gap) when they resonantly coexist in the same structure. Infiltration of opal with polarizable molecules combines the polaritonic and Bragg diffractive effects. Both effects exist independently when the Bragg (at ω = ωB) and polaritonic (ω = ωT) resonances are well separated in frequency. A completely different situation occurs when ωTωB. Such a condition was achieved in opals that were infiltrated with J-aggregates of cyanine dyes that have large Rabi frequency. Our measurements show some dramatic changes in the shape of the reflectivity plateaus, which are due to the interplay between the photonic band gap and the polaritonic gap. The experimental results on reflectivity and its dependence on the light propagation angle and concentration of the cyanie dyes are in agreement with the theoretical calculations.

Paper Details

Date Published: 18 December 2002
PDF: 11 pages
Proc. SPIE 4798, Linear and Nonlinear Optics of Organic Materials II, (18 December 2002); doi: 10.1117/12.458241
Show Author Affiliations
Nayer Eradat, Optical Sciences Ctr./Univ. of Arizona (United States)
A. Yu Sivachenko, Univ. of Utah (United States)
Mikhail E. Raikh, Univ. of Utah (United States)
Z. Valy Vardeny, Univ. of Utah (United States)
Anvar A. Zakhidov, Univ. of Texas at Dallas (United States)
S. Li, Univ. of Texas at Dallas (United States)
Ray Henry Baughman, Univ. of Texas at Dallas (United States)

Published in SPIE Proceedings Vol. 4798:
Linear and Nonlinear Optics of Organic Materials II
Manfred Eich; Mark G. Kuzyk, Editor(s)

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