Journal Club: imaging through scattering media
Presented by George
- Recent Nature photonics paper on scattering.
- Imaging deep with a scattering medium … : http://www.nature.com/nphoton/journal/vaop/ncurrent/abs/nphoton.2015.24.html
- just want photons that hit target and bounce back, not the ones that scatter of tissue. Also don’t want to lose photons.
- goal: isolate the singly scattered photons from the imaging plane. Image at large mean-free-path lengths
- approach: time gating: select photons with only a certain time of flight.
- and coherent wave addition
- time gating – split beam, reflect of reference mirror, time return.
- time resolution of 76 fs (11.4 um difference in path length can be detected).
- some photons take same time as sample light but scatter off something else (possibly in more bounces).
- incident wave vector is known, scattering from sample is known, cna distinguish
- intefere with reference beam to seperate correct photons
- can see much deeper than
- how does this compare to AO (correcting just the photons that hit the target so they stay in focus).
- A: probably not compatible given need to manipulate beam.
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