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Proceedings Paper

Double grating design of 3D phase matched waveguide for second harmonic χ(2) process
Author(s): Alessandro Massaro; Roberto Cingolani; Massimo De Vittorio; Adriana Passaseo
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Paper Abstract

Theoretical analysis on second harmonic (SH) generation with phase matched grating in waveguide is presented from the viewpoint of device design. Usually high intensity sources are necessary in order to observe a SH in a χ(2) nonlinear structure. For this purpose, the novel proposed design takes into account a double grating effect which enhances the guided SH signal along the waveguide. In the presented structure two grating are considered: the first grating, considered at the interface between air and core, is designed in order to obtain an efficient SH conversion process by considering the quasi phase matching (QPM) condition; the second grating, placed at the interface between the core and the substrate region, increases the SH power along the propagation direction through the coupling with the substrate modes generated by the diffraction effect. The novelty of this work is in the combined effect of the two gratings. The grating lengths and periods are designed by considering the nonlinear coupled mode theory with the effective dielectric constant (EDC) assumption. The analysis includes three dimensional (3D) cases where phase matching is involved, in particular the model is applied to a GaAs/AlGAs waveguides with fundamental wavelength at λFU=1.55 μm and SH signal at λSH =0.775 μm.

Paper Details

Date Published: 19 May 2009
PDF: 8 pages
Proc. SPIE 7354, Nonlinear Optics and Applications III, 73540V (19 May 2009); doi: 10.1117/12.820443
Show Author Affiliations
Alessandro Massaro, Univ. del Salento (Italy)
Roberto Cingolani, Univ. del Salento (Italy)
Massimo De Vittorio, Univ. del Salento (Italy)
Adriana Passaseo, Univ. del Salento (Italy)


Published in SPIE Proceedings Vol. 7354:
Nonlinear Optics and Applications III
Mario Bertolotti, Editor(s)

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