Figure 1
From: Optical tracking of picosecond coherent phonon pulse focusing inside a sub-micron object
Experimental setup, and the acoustic and optical profiles for fibre radius Rf=1150 nm based on Gaussian beam theory. (a) Sample and setup. (b) Theoretical optical probe (blue) and acoustic-strain (red) 1/e2 beam radii (wE(x) and wA(x), respectively) as a function of propagation distance x (over the region from the front surface of the fibre to the back) calculated from Gaussian-beam theory for a fibre of radius Rf=1150 nm. (The dashed line indicates the position of the centre of the fibre.)
