Spatial manipulation of nanoacoustic waves with nanoscale spot sizes
| العنوان: | Spatial manipulation of nanoacoustic waves with nanoscale spot sizes |
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| المؤلفون: | Jin-Wei Shi, Jen-Inn Chyi, Kung-Hsuan Lin, Chieh-Feng Chang, Shih Ze Sun, Chang Chi Pan, Chi-Kuang Sun, Chih Ming Lai |
| المصدر: | Nature Nanotechnology. 2:704-708 |
| بيانات النشر: | Springer Science and Business Media LLC, 2007. |
| سنة النشر: | 2007 |
| مصطلحات موضوعية: | Optics and Photonics, Phonon, Terahertz radiation, Biomedical Engineering, Physics::Optics, Bioengineering, Nanotechnology, law.invention, Optics, law, Scattering, Radiation, Computer Simulation, General Materials Science, Stimulated emission, Electrical and Electronic Engineering, Physics, business.industry, Scattering, Acoustics, Models, Theoretical, Condensed Matter Physics, Laser, Atomic and Molecular Physics, and Optics, Wavelength, Femtosecond, Photonics, business, Nanospheres |
| الوصف: | Coherent acoustic phonons are generated at terahertz frequencies when semiconductor quantum-well nanostructures are illuminated by femtosecond laser pulses. These phonons-also known as nanoacoustic waves-typically have wavelengths of tens of nanometres, which could prove useful in applications such as non-invasive ultrasonic imaging and sound amplification by the stimulated emission of radiation. However, optical diffraction effects mean that the nanoacoustic waves are produced with spot sizes on the micrometre scale. Near-field optical techniques can produce waves with smaller spot sizes, but they only work near surfaces. Here, we show that a far-field optical technique--which suffers no such restrictions--can be used to spatially manipulate the phonon generation process so that nanoacoustic waves are emitted with lateral dimensions that are much smaller than the laser wavelength. We demonstrate that nanoacoustic waves with wavelengths and spot sizes of the order of 10 nm and 100 nm, respectively, can be generated and detected. |
| تدمد: | 1748-3395 1748-3387 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3748bc04b023fffb8e9e661223b7c541 https://doi.org/10.1038/nnano.2007.319 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....3748bc04b023fffb8e9e661223b7c541 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 17483395 17483387 |
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