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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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10.1063/1.1941475
/content/aip/journal/apl/86/22/10.1063/1.1941475
http://aip.metastore.ingenta.com/content/aip/journal/apl/86/22/10.1063/1.1941475
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) SL sample structure, and (b) calculated folded LA phonon dispersion for the SL, is the SL period.

Image of FIG. 2.
FIG. 2.

FFT power spectrum of the femtosecond pump-probe signal, showing a strong peak at corresponding to the first SL mini-zone center LA mode. The inset shows a zoomed section of the part of the signal for pump-probe delays between 10 and 15 ps. Oscillations in the differential transmission with a period of 790 fs are seen.

Image of FIG. 3.
FIG. 3.

Bolometer signals for various pump photon wavelengths after subtraction of the optical (direct and PL) component, the traces have been offset for clarity. The arrival times of the LA and TA phonon signals are indicated. Notice that the LA signal dominates under resonant photoexcitation.

Image of FIG. 4.
FIG. 4.

Integrated LA signal intensity as a function of the pump photon wavelength, showing a sharp increase when the photon energy matches the SL fundamental gap, .

Image of FIG. 5.
FIG. 5.

Emission angle dependence of the LA bolometer signal. The angle is measured with respect to the normal to the SL layers.

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/content/aip/journal/apl/86/22/10.1063/1.1941475
2005-05-25
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Generation of terahertz monochromatic acoustic phonon pulses by femtosecond optical excitation of a gallium nitride/aluminium nitride superlattice
http://aip.metastore.ingenta.com/content/aip/journal/apl/86/22/10.1063/1.1941475
10.1063/1.1941475
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