Mode selective excitation and detection of Lamb waves

2010 ◽  
Author(s):  
K. Hahn ◽  
U. Amjad ◽  
K. S. Tarar ◽  
D. Jha ◽  
W. Grill
Keyword(s):  
Lamb Waves ◽  
Selective Excitation

Zero order mode selective excitation and highly resolved observations of lamb waves

2011 ◽  
Author(s):  
A. Abdelrahman ◽  
U. Amjad ◽  
D. Jha ◽  
K. S. Tarar ◽  
W. Grill
Keyword(s):  
Lamb Waves ◽  
Selective Excitation ◽  
Zero Order ◽  
Order Mode

NOVEL PIEZOELECTRIC FIBER TRANSDUCERS FOR MODE SELECTIVE EXCITATION AND DETECTION OF LAMB WAVES

2009 ◽  
Author(s):  
B. Koehler ◽  
B. Frankenstein ◽  
F. Schubert ◽  
M. Barth ◽  
Donald O. Thompson ◽  
...  
Keyword(s):  
Lamb Waves ◽  
Selective Excitation ◽  
Piezoelectric Fiber

USE OF LAMB WAVES TO DETECT DAMAGE TO METAL BEAMS

2017 ◽  
Author(s):  
Anorosval Pedro Leirias da Silva Jr ◽  
Paulo Rogério Novak
Keyword(s):  
Lamb Waves

Laser vibrometry of air-coupled Lamb waves

2005 ◽  
Vol 47 (3) ◽  
pp. 123-128 ◽  
Author(s):  
Igor Solodov ◽  
Klaus Pfleiderer ◽  
Gerhard Busse
Keyword(s):  
Lamb Waves ◽  
Laser Vibrometry

Warped-wigner-hough transformation of lamb waves for automatic defect detection

2011 ◽  
Author(s):  
Alessandro Perelli ◽  
Luca De Marchi ◽  
Emanuele Baravelli ◽  
Alessandro Marzani ◽  
Nicolo Speciale
Keyword(s):  
Defect Detection ◽  
Lamb Waves ◽  
Hough Transformation

scholarly journals Frequency-domain study of nonthermal gigahertz phonons reveals Fano coupling to charge carriers

2020 ◽  
Vol 6 (51) ◽  
pp. eabd4540
Author(s):  
Thomas Vasileiadis ◽  
Heng Zhang ◽  
Hai Wang ◽  
Mischa Bonn ◽  
George Fytas ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Acoustic Waves ◽  
Lamb Waves ◽  
Charge Carriers ◽  
Acoustic Phonons ◽  
Phonon Spectra ◽  
Electron Hole Plasma ◽  
Nonequilibrium Conditions ◽  
Microelectronic Components ◽  
Anti Stokes

Telecommunication devices exploit hypersonic gigahertz acoustic phonons to mediate signal processing with microwave radiation, and charge carriers to operate various microelectronic components. Potential interactions of hypersound with charge carriers can be revealed through frequency- and momentum-resolved studies of acoustic phonons in photoexcited semiconductors. Here, we present an all-optical method for excitation and frequency-, momentum-, and space-resolved detection of gigahertz acoustic waves in a spatially confined model semiconductor. Lamb waves are excited in a bare silicon membrane using femtosecond optical pulses and detected with frequency-domain micro-Brillouin light spectroscopy. The population of photoexcited gigahertz phonons displays a hundredfold enhancement as compared with thermal equilibrium. The phonon spectra reveal Stokes–anti-Stokes asymmetry due to propagation, and strongly asymmetric Fano resonances due to coupling between the electron-hole plasma and the photoexcited phonons. This work lays the foundation for studying hypersonic signals in nonequilibrium conditions and, more generally, phonon-dependent phenomena in photoexcited nanostructures.

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