Table 1 Comparison of different ultrafast TA mode photo-transducers.

From: Giant ultrafast photo-induced shear strain in ferroelectric BiFeO3

References

23

26, 23

22

This work

Materials

GaAs

Zn

GaN

BiFeO3

TA mode frequency (GHz)

~20

~25

63

10–25

TA sound velocity (m s−1)

~3,020

~2,730–3,230

4,240

2,000–2,200

Amplitude ratio TA/LA

~0.2

~0.2–0.5

~1

~6

  1. LA, longitudinal acoustic; TA, transverse acoustic.
  2. Comparison of properties of detected coherent TA for different materials: frequency, sound velocity and amplitude ratio between coherent TA and LA acoustic signals.
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