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Proceedings Paper

Optical and acoustical ridge waveguides based on piezoelectric semiconductors for novel integrated acoustooptic components
Author(s): Jan Brückner; Jürgen Silbereisen; Dominique Daub D.V.M.; Ulf Geyer; Georg Bastian; Bruno Daniel; Michael Hetterich
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Paper Abstract

The interaction of surface acoustic waves (SAWs) and light is spatially restricted to a region close to the surface approximately given by the acoustical wavelength. Therefore optical waveguides very close to the surface are required for high-frequency i.e. short-wavelength acoustic waves. In contrast to existing collinear integrated acoustooptical devices we are aiming at the regime where the optical and acoustical wavelengths are comparable. The periodically modulated refractive index caused by the SAWs may serve as a tunable and switchable optical add/drop comparable to fiber Bragg gratings, though not static. Another aspect of this regime is the phonon energy, which is non-negligible compared to the energy of the photons. So a significant energy shift i.e. wavelength conversion caused by scattering processes can be exploited. Existing integrated optical waveguides based on silica, SOI, lithiumniobate or III-V semiconductors are not suitable for a realization of such components, due to small piezoelectric coefficients or weak optical confinement. In contrast, heterostructures made of II-VI compounds are promising candidates for the proposed applications. Using Beam Propagation simulations we developed an optimized ridge waveguide structure based on a CdSe/CdS heterostructure, grown by molecular beam epitaxy. The waveguide is defined by wet-chemical etching using a standard photoresist mask. The mode field dimensions are about 1 μm x 2 μm, which requires fiber coupling using lensed fibers. We present measured coupling and propagation losses and discuss the integration with acoustical waveguides.

Paper Details

Date Published: 20 April 2006
PDF: 11 pages
Proc. SPIE 6183, Integrated Optics, Silicon Photonics, and Photonic Integrated Circuits, 618309 (20 April 2006); doi: 10.1117/12.662775
Show Author Affiliations
Jan Brückner, Univ. Karlsruhe (Germany)
Jürgen Silbereisen, Univ. Karlsruhe (Germany)
Dominique Daub D.V.M., Univ. Karlsruhe (Germany)
Ulf Geyer, Univ. Karlsruhe (Germany)
Georg Bastian, Univ. Karlsruhe (Germany)
Bruno Daniel, Univ. Karlsruhe (Germany)
Michael Hetterich, Univ. Karlsruhe (Germany)

Published in SPIE Proceedings Vol. 6183:
Integrated Optics, Silicon Photonics, and Photonic Integrated Circuits
Giancarlo C. Righini, Editor(s)

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