کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1759478 | 1019279 | 2012 | 4 صفحه PDF | دانلود رایگان |
Spectral characteristics of laser-generated acoustic waves in an InGaN/GaN superlattice structure are studied at room temperature. Acoustic vibrations in the structure are excited with a femtosecond laser pulse and detected via transmission of a delayed probe pulse. Seven acoustic modes of the superlattice are detected, with frequencies spanning a range from 0.36 to 2.5 THz. Acoustic waves up to ∼2 THz in frequency are not significantly attenuated within the transducer which indicates excellent interface quality of the superlattice. The findings hold promise for broadband THz acoustic spectroscopy.
► We are aiming to extend acoustic spectroscopy across the whole Brillouin zone.
► Femtosecond laser pulses excite multiple acoustic modes of a 10-period InGaN/GaN superlattice.
► Seven modes spanning a range from 0.36 to 2.5 THz are detected.
► Acoustic waves up to ∼2 THz are not significantly attenuated within the superlattice.
Journal: Ultrasonics - Volume 52, Issue 1, January 2012, Pages 1–4