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Proceedings Paper

Photoreactive third-harmonic generation via either one- or two-photon excitation in diarylethene-polymethylmethacrylate polymer thin films: theory and experiment
Author(s): Jian Hung Lin; Ngoc Diep Lai; Wei Lin Wang; Chia Chen Hsu
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Paper Abstract

Photoreactive third-harmonic (TH) generation at 355 nm in diarylethene- polymethylmethacrylate (DE-PMMA) polymer thin films is obtained by either one- or two-photon excitation. TH intensity generated from a DE-PMMA polymer thin film decreases, when it is pumped by either 325 nm or 442 nm, which change molecular structure of DE molecules from open-form (A form) to closed-form (B form). TH intensity recovers to its original intensity level, after all B form DE molecules return to A form induced by 532 nm or 1064 nm laser irradiation. The experimental results reveal that the second-order hyperpolarizability (γ) of A form molecules may be larger than that of B form molecules. Moreover, TH output efficiency is independent of the angle between the pump and probe polarization directions. Those experimental results were explained by using a photoinduced isomerization theory based angular hole burning and angular redistribution mechanisms for two-dimensional structure of DE molecules including the two-photon absorption effect of B form. The simulation results are consistent with those of optical pumping TH experiment.

Paper Details

Date Published: 18 August 2005
PDF: 11 pages
Proc. SPIE 5935, Linear and Nonlinear Optics of Organic Materials V, 593511 (18 August 2005); doi: 10.1117/12.614782
Show Author Affiliations
Jian Hung Lin, National Chung Cheng Univ. (Taiwan)
Ngoc Diep Lai, National Chung Cheng Univ. (Taiwan)
Wei Lin Wang, National Chung Cheng Univ. (Taiwan)
Chia Chen Hsu, National Chung Cheng Univ. (Taiwan)

Published in SPIE Proceedings Vol. 5935:
Linear and Nonlinear Optics of Organic Materials V
Manfred Eich, Editor(s)

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