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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47497

Title: Spatial manipulation of nanoacoustic waves with nanoscale spot sizes
Authors: C.-K. Sun
K.-H. Lin
C.-M. Lai
C.-C. Pan
J.-I. Chyi
J.-W. Shi
S.-Z. Sun
C,-F. Chang
Contributors: 國立臺灣海洋大學:光電科學研究所
Date: 2007-11
Issue Date: 2018-07-26T08:34:30Z
Publisher: Nature Nanotechnology
Abstract: Abstract: Coherent acoustic phonons are generated at terahertz frequencies when semiconductor quantum-well nanostructures are illuminated by femtosecond laser pulses1,2,3,4,5,6,7,8,9. 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 imaging10,11,12 and sound amplification by the stimulated emission of radiation13. 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 surfaces14. 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.
Relation: 2(11) pp.704-708
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47497
Appears in Collections:[光電科學研究所] 期刊論文

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