Physics – Optics
Scientific paper
2010-01-07
Physics
Optics
We corrected an ambiguous description of the focus size in our abstract and text pointed out by an anonymous referee
Scientific paper
In turbid materials it is impossible to concentrate light into a focus with conventional optics. Recently it has been shown that the intensity on a dyed probe inside a turbid material can be enhanced by spatially shaping the wave front of light before it enters a turbid medium. Here we show that this enhancement is due to concentration of light energy to a spot much smaller than a wavelength. We focus light on a dyed probe sphere that is hidden under an opaque layer. The light is optimally concentrated to a focus which does not exceed the smallest focal area physically possible by more than 68%. A comparison between the intensity enhancements of both the emission and excitation light supports the conclusion of optimal light concentration.
Lagendijk A.
Mosk Allard P.
van Putten Elbert G.
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