Optimal concentration of light in turbid materials
| Abstract | 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 toa spot much smaller that 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 with an area that is for certain within 68% of the smallest focal area physically possible. A comparison between the intensity enhancements of both the emission and excitation light supports the conclusion of optimal light concentration. |
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| Authors | E.G. van Putten, A. P. Mosk, A. Lagendijk |
| Year of publication | 2011 |
| Date published | 04/2011 |
| Journal | J. Opt. Soc. Am. B |
| Volume | 28 |
| Pages | 1200–1203 |
| DOI number | 10.1364/JOSAB.28.001200 |
| Keywords | disordered materials, focusing, Optimal concentration, scattering, Wavefront shaping |