Abstract
We demonstrate experimentally that optical phase conjugation can be used to focus light through strongly scattering media even when far less than a photon per optical degree of freedom is detected. We found that the best achievable intensity contrast is equal to the total number of detected photons, as long as the resolution of the system is high enough. Our results demonstrate that phase conjugation can be used even when the photon budget is extremely low, such as in high-speed focusing through dynamic media or imaging deep inside tissue.
Highlights
Biological tissue strongly scatters light, traditionally limiting the depth of optical imaging to within one millimeter
We demonstrate experimentally that optical phase conjugation can be used to focus light through strongly scattering media even when far less than a photon per optical degree of freedom is detected
We found that the best achievable intensity contrast is equal to the total number of detected photons, as long as the resolution of the system is high enough
Summary
Biological tissue strongly scatters light, traditionally limiting the depth of optical imaging to within one millimeter. Optical Phase Conjugation with Less Than a Photon per Degree of Freedom
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