15 September 2004 Intense acoustic beams for photonic modulation
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We report on the generation of strong surface acoustic wave (SAW) beams on GaAs substrates as well as on their concentration and guiding using acoustic horns and waveguides (WGs). By means of focusing interdigital transducers, we demonstrate the generation of narrow (full width at half maximum of approximately 15 μm), high-frequency (0.5 GHz) SAW beams collimated over distances exceeding 100 μm. The beams can be guided along the surface using narrow (10-μm-wide) WGs of ridge and slot types. The coupling of the SAW into the WGs was achieved using acoustic horns. Coupling power efficiencies of up to 75%, which translates into an eightfold increase of the local acoustic power density within the WG, is demonstrated using slot WGs with a 80-nm-thick aluminum cladding region.
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Mauricio M. de Lima, Mauricio M. de Lima, Juana Camacho, Juana Camacho, Werner Seidel, Werner Seidel, Helmar Kostial, Helmar Kostial, Paulo V. Santos, Paulo V. Santos, } "Intense acoustic beams for photonic modulation", Proc. SPIE 5450, Photonic Crystal Materials and Nanostructures, (15 September 2004); doi: 10.1117/12.545590; https://doi.org/10.1117/12.545590

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