Controlling light in scattering media
Controlling light in scattering media
Controlling light in scattering media
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Measur<strong>in</strong>g the transmission matrix K<br />
CCD<br />
Reference<br />
Part<br />
1) Display vector U k on the controlled<br />
part<br />
P<br />
x40<br />
AN : 0.75<br />
x20<br />
AN : 0.5<br />
Controlled Part<br />
2) Shift the global phase of the<br />
reference and take 4 speckle image<br />
Laser 532nm<br />
Observation<br />
W<strong>in</strong>dow<br />
sample<br />
P<br />
D<br />
3) Retrieve the amplitude and phase of<br />
the speckle due to the U k (<strong>in</strong>clud<strong>in</strong>g<br />
reference) E out .E ref<br />
Repeat N times<br />
L<br />
L<br />
P<br />
SLM<br />
Measured<br />
TM<br />
K obs = K<br />
× S ref<br />
exact TM<br />
Diagonal<br />
matrix