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Coherent Control of Light Transmission and Absorption in Random Scattering Media
Hui Cao Dept. of Applied Physics, Yale University
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Sebastien Popoff, Seng Fatt Liew, Wenjie WanDouglas Stone, Arthur GoetschyCharles Schmuttenmaer, Stafford Sheehan
R
T
Can we modify total transmission?
Transmission Through Random Scattering Media
Sample thickness L > Transport mean free path l
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Bimodal distribution of transmission eigenvalues
P
Dorokhov, Solid State Commun. 51, 381 (1984). Mello et al. Ann. Phys. 181, 290 (1988).Nazarov, Phys. Rev. Lett. 73, 134 (1994).
∝
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High Transmission Channel
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Quarter circle distribution of transmission eigenvalues
Experimental measurement of partial transmission matrix
Optical Transmission Matrix
Open geometry
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Popoff et al. Phys. Rev. Lett. 104, 100601 (2010)
Kim et al, Nat. Photon. 6, 583 (2012). Yu et al, Phys. Rev. Lett. 111, 153902 (2013)
Popoff et al. Phys. Rev. Lett. 104, 100601 (2010)
Quarter circle distribution of transmission eigenvalues
Bimodal distribution of transmission eigenvalues
Optical Transmission Matrix
Kim et al, Nat. Photon. 6, 583 (2012). Yu et al, Phys. Rev. Lett. 111, 153902 (2013)
Slab geometry
p(T)
T
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Berkovits & Feng, Phys. Rep. 238, 135 (1994)
Mesoscopic Correlation
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Crossing of scattering paths induces non‐local correlation of transmitted light.
Experimental SetupIr
It
Ii
Ii: input intensity Ir: reflected intensity It: total transmitted intensity
• High input NA, output NA~1• 2 polarizations phase modulation
• Control input wavefront with a large number of SLM segments (up to ~2000) 15
Enhancement & Suppression of Total Transmission
Sample thickness L ~ 20mMean free path l ~ 0.8mIllumination area diameter ~ 8.3mTotal transmission 〈T〉~ 5%
Tmax = 3.6〈T〉 ~ 18%Tmin = 0.3〈T〉 ~ 1.6%
11min
max TT
1 µm
TiO2particle
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Mesoscopic Correlation
Vary sample thickness L from ~ 7 μm to 30 μmChange illumination size D from ~ 2.7 μm to 8.3 μm
Comparison with uncorrelated model
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10 15 20 25 30 35
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3 4 5 6 7 8
Popoff et al. Phys. Rev. Lett. 112, 133903 (2014) 17
Incomplete control of channels
Goetschy & Stone, Phys. Rev. Lett. 111, 063901 (2013)
Theoretical prediction
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Random Media with Non‐Uniform Absorption
Liew & Cao, arXiv 1503.00821 (2015)
Maximal enhancement of total transmission through a random medium with non‐uniform absorption exceeds that without absorption.
Coherent Control of Light Absorption
Chong, Ge, HC, and Stone, Phys. Rev. Lett. 105, 053901 (2010) Wan, Chong, Ge, Noh, Stone, & HC, Science 331, 889 (2011)
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997 998 999 10000
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Mod
ulat
ion
Dep
th
Wavelength(nm)
Maximal output / Minimal Output
Laser
Coherent perfect absorber
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27min
max PP
Light-induced current Light-induced electric power
2.1
0.33
Variation of Light Absorption
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