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Generation of terahertz monochromatic acoustic phonon pulses by femtosecond optical excitation of a gallium nitride/aluminium nitride superlattice

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6 Author(s)
Martinez, C.E. ; School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, United Kingdom NG7 2RD ; Stanton, N.M. ; Walker, P.M. ; Kent, A.J.
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We describe the generation of pulses of monochromatic acoustic phonons by ultrafast laser excitation of a gallium nitride/aluminium nitride superlattice (SL). The SL response to the optical excitation was studied using femtosecond pump-probe measurements. Superconducting bolometers were used to detect the phonons that leak out of the SL and propagate across the substrate. We see that, for excitation wavelengths around 430 nm, a pronounced enhancement in the longitudinal acoustic phonon signal occurs. The results are consistent with similar measurements using GaAs/AlAs SL’s, where propagating monochromatic phonons were generated under resonant photoexcitation [Appl. Phys. Lett. 81, 3497 (2002)].

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Applied Physics Letters  (Volume:86 ,  Issue: 22 )