Generation and Propagation of Superhigh-Frequency Bulk Acoustic Waves in GaAs
| Autor: | Antonio Crespo-Poveda, Paulo V. Santos, Alexander S. Kuznetsov, Klaus Biermann, Luis Vicente de Andrade Scalvi, Diego H. O. Machado |
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| Přispěvatelé: | Leibniz-Institut im Forschungsverbund Berlin E.V., Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Phonon FOS: Physical sciences General Physics and Astronomy Applied Physics (physics.app-ph) 02 engineering and technology 01 natural sciences Condensed Matter::Materials Science Quality (physics) 0103 physical sciences Thermal 010306 general physics Optomechanics Condensed Matter - Materials Science business.industry Scattering Materials Science (cond-mat.mtrl-sci) Physics - Applied Physics Acoustic wave Atmospheric temperature range Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Piezoelectricity Optoelectronics 0210 nano-technology business |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Coherent super-high-frequency (SHF) vibrations provide an excellent tool for the modulation and control of excitations in semiconductors. Here, we investigate the piezoelectric generation and propagation of longitudinal bulk acoustic waves (LBAWs) with frequencies up to 20 GHz in GaAs crystals using bulk acoustic wave resonators (BAWRs) based on piezoelectric thin ZnO films. We show that the electro-acoustic conversion efficiency of the BAWRs depends sensitively on the sputtering conditions of the ZnO films. The BAWRs were then used for the study of the propagation properties of the LBAWs in GaAs in the frequency and temperature ranges from 1 to 20 GHz and 10 and 300 K, respectively, which have so far not been experimentally accessed. We found that the intrinsic acoustic absorption of GaAs in the temperature range from 80 K to 300 K is dominated by scattering with thermal phonons. At lower temperatures, in contrast, the intrinsic acoustic absorption saturates at a frequency-dependent value. Experiments carried out with different propagation lengths indicate that the saturation is associated with losses during reflection at the sample boundaries. We also demonstrate devices with high quality factor fabricated on top of acoustic Bragg-reflectors. The results presented here prove the feasibility of high-quality acoustic resonators embedding GaAs-based nanostructures, thus opening the way for the modulation and control of their properties by electrically excited SHF LBAWs. Comment: Research article |
| Databáze: | OpenAIRE |
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