Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Saturation effects in All-Optical Poling of dye molecules. 3D studies.

Not Accessible

Your library or personal account may give you access

Abstract

Photoinduced Anisotropy (PIA) and All-Optical Poling (AOP) are now well known techniques for orienting dye molecules in polymer films, at room temperature. They are efficient when the resonant excitation leads to a reversible photoisomerization (particularly for Trans-Cis isomerization of azodyes). In both cases, molecules are excited selectively (angular hole burning) and rotate, when they relax to the ground state (angular redistribution). After many photoisomerization cycles, molecules accumulate in the directions of smallest excitation probability. In PIA, the linear interaction with a polarized light aligns molecules perpendicularly to the polarization. In AOP, the nonlinear pumping by two coherent waves, ω and 2ω, produces a non-centrosymmetric depletion of the Trans state. Nevertheless, unavoidable one-photon (2ω) and two-photon (ω) absorption terms are centrosymmetric and induce anisotropy, which is detrimental for building χ(2). For that reason, we decided to measure simultaneously anisotropy and second harmonic generation (SHG), in AOP, and we tried to pump with a third beam, for correcting anisotropy.

© 2003 Optical Society of America

PDF Article
More Like This
Characterization of dye-containing polymers ability tobe optically oriented

Michel Dumont and Michel Fischer
FC2 Organic Thin Films (OTF) 1999

Photo-induced flip-flop of membrane markers monitored by SHG microscopy

T. Pons and J. Mertz
5139_107 European Conference on Biomedical Optics (ECBO) 2003

Photoinduced Anisotropy and Poling of Organic Films: New 3D studies and Modelization

M. L. Dumont and N. Nguyen-Thi-Kim
STuD3 Frontiers in Optics (FiO) 2005

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved