Exciton-resonant detection of high-frequency surface acoustic waves from subwavelength metal gratings
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909990111936512 |
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| author | Ken, Olga Horiachyi, Dmytro Akimov, Ilya Korenev, Vladimir Gusev, Vitalyi Litvin, Leonid Kahl, Michael Ludwig, Arne Spitzer, Nikolai Wieck, Andreas D. Bayer, Manfred |
| author_facet | Ken, Olga Horiachyi, Dmytro Akimov, Ilya Korenev, Vladimir Gusev, Vitalyi Litvin, Leonid Kahl, Michael Ludwig, Arne Spitzer, Nikolai Wieck, Andreas D. Bayer, Manfred |
| contents | We report on all-optical generation and detection of high-frequency (up to about 30 GHz) surface acoustic waves (SAWs) in GaAs/AlGaAs heterostructures with short-period Au gratings on top. A highly sensitive method for SAW detection is demonstrated using a polarization-resolved pump-probe technique that exploits the narrow exciton resonance in high-quality GaAs. The elastic strain of the SAW modulates the exciton energy in the time domain. As a result, even a small deformation produces a noticeable change in the dielectric function at the detection wavelength leading to an order of magnitude increase in the detection sensitivity as compared to off-resonant conditions. A theoretical model is developed that considers two detection schemes: one accounting for probe light diffraction and one corresponding to a non-diffractive situation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_11425 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exciton-resonant detection of high-frequency surface acoustic waves from subwavelength metal gratings Ken, Olga Horiachyi, Dmytro Akimov, Ilya Korenev, Vladimir Gusev, Vitalyi Litvin, Leonid Kahl, Michael Ludwig, Arne Spitzer, Nikolai Wieck, Andreas D. Bayer, Manfred Mesoscale and Nanoscale Physics We report on all-optical generation and detection of high-frequency (up to about 30 GHz) surface acoustic waves (SAWs) in GaAs/AlGaAs heterostructures with short-period Au gratings on top. A highly sensitive method for SAW detection is demonstrated using a polarization-resolved pump-probe technique that exploits the narrow exciton resonance in high-quality GaAs. The elastic strain of the SAW modulates the exciton energy in the time domain. As a result, even a small deformation produces a noticeable change in the dielectric function at the detection wavelength leading to an order of magnitude increase in the detection sensitivity as compared to off-resonant conditions. A theoretical model is developed that considers two detection schemes: one accounting for probe light diffraction and one corresponding to a non-diffractive situation. |
| title | Exciton-resonant detection of high-frequency surface acoustic waves from subwavelength metal gratings |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2507.11425 |