Coupling of energy into the fundamental diffusion mode of a complex nanophotonic medium

Oluwafemi S. Ojambati, Hasan Yilmaz, Ad Lagendijk, Allard P. Mosk, Willem L. Vos

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Abstract

We demonstrate experimentally that optical wavefront shaping increases light coupling into the fundamental diffusion mode of a scattering medium. The total energy density inside a scattering medium of zinc oxide nanoparticles was probed by exciting fluorescent spheres that were randomly positioned in the medium and collecting the fluorescent power. We optimized the incident wavefront to obtain a bright focus at the back surface of the sample and found that the concomitant fluorescent power is enhanced compared to a non-optimized incident wavefront. The observed enhancement increases with sample thickness. Based on diffusion theory, we derive a model wherein the distribution of the energy density of wavefront-shaped light is dominated by the fundamental diffusion mode. Our model agrees remarkably well with our experiments, notably since the model has no freely adjustable parameters.
Original languageEnglish
Article number043032
Number of pages14
JournalNew journal of physics
Volume18
DOIs
Publication statusPublished - 21 Apr 2016

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flux density
diffusion theory
scattering
zinc oxides
energy
nanoparticles
augmentation

Keywords

  • IR-101648
  • METIS-318191

Cite this

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Coupling of energy into the fundamental diffusion mode of a complex nanophotonic medium. / Ojambati, Oluwafemi S.; Yilmaz, Hasan; Lagendijk, Ad; Mosk, Allard P.; Vos, Willem L.

In: New journal of physics, Vol. 18, 043032, 21.04.2016.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Coupling of energy into the fundamental diffusion mode of a complex nanophotonic medium

AU - Ojambati, Oluwafemi S.

AU - Yilmaz, Hasan

AU - Lagendijk, Ad

AU - Mosk, Allard P.

AU - Vos, Willem L.

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AB - We demonstrate experimentally that optical wavefront shaping increases light coupling into the fundamental diffusion mode of a scattering medium. The total energy density inside a scattering medium of zinc oxide nanoparticles was probed by exciting fluorescent spheres that were randomly positioned in the medium and collecting the fluorescent power. We optimized the incident wavefront to obtain a bright focus at the back surface of the sample and found that the concomitant fluorescent power is enhanced compared to a non-optimized incident wavefront. The observed enhancement increases with sample thickness. Based on diffusion theory, we derive a model wherein the distribution of the energy density of wavefront-shaped light is dominated by the fundamental diffusion mode. Our model agrees remarkably well with our experiments, notably since the model has no freely adjustable parameters.

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