Significant Enhancement of the Optical Second Harmonic Generation in a Poled Azopolymer Thin Grating
| Autor: | Frédéric Adamietz, Claude Sourisseau, Vincent Rodriguez, François Lagugné-Labarthet |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Diffraction
Materials science business.industry Physics::Optics Second-harmonic generation Grating Surfaces Coatings and Films Nonlinear optical Optics Materials Chemistry Optoelectronics Surface second harmonic generation Physical and Theoretical Chemistry Thin film business Surface relief grating Inscribed figure |
| Zdroj: | The Journal of Physical Chemistry B. 110:13689-13693 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp062955v |
| Popis: | Nonlinear optical properties of an electrically poled surface relief grating inscribed on a thin film of azopolymer have been investigated. The linear and nonlinear optical far-field diffraction patterns of the grating are compared, and they show a clear angular separation of the fundamental (lambda = 1.064 mum) and second harmonic generated beams that are diffracted at different angles. The intensity of the zero order transmitted second harmonic generation (SHG) beam from inscribed surface relief grating (SRG) areas has been recorded using the Maker fringe technique and compared to the response from flat areas that were only poled. Poled gratings exhibit a sharp second harmonic generation enhancement for coupling angles of theta(i) = +/-52 degrees due to a quasi-phase matching process. A simple phenomenological model allows one to explain both the second harmonic intensity generated from the thin polar film and the dispersion curve observed under "pp" polarization due to the mismatch of the angular coupling condition: this gives us a good indication of the intensity enhancement of the SHG beam in the forward direction. |
| Databáze: | OpenAIRE |
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