Double grating design of 3D phase matched waveguide for second harmonic chi(2) process

Alessandro Massaro; Roberto Cingolani; Massimo De Vittorio; Adriana Passaseo

doi:10.1117/12.820443

19 May 2009 Double grating design of 3D phase matched waveguide for second harmonic χ⁽²⁾ process

Alessandro Massaro, Roberto Cingolani, Massimo De Vittorio, Adriana Passaseo

Proceedings Volume 7354, Nonlinear Optics and Applications III; 73540V (2009) https://doi.org/10.1117/12.820443
Event: SPIE Optics + Optoelectronics, 2009, Prague, Czech Republic

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 λ_FU=1.55 μm and SH signal at λ_SH =0.775 μm.

Citation Download Citation

Alessandro Massaro, Roberto Cingolani, Massimo De Vittorio, and Adriana Passaseo "Double grating design of 3D phase matched waveguide for second harmonic χ⁽²⁾ process", Proc. SPIE 7354, Nonlinear Optics and Applications III, 73540V (19 May 2009); https://doi.org/10.1117/12.820443

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KEYWORDS

Waveguides

Optical design

3D modeling

Diffraction gratings

Interfaces

Phase matching

Diffraction

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