# 09- Exploiting Tailored Disorder in Dielectric Nanosurfaces to Maximize their Information Capacity

**Source**: https://www.cs.tum.de/spp1839/projects/2nd-period-2018-2021/09.html
**Parent**: https://www.cs.tum.de/spp1839/projects.html

Dielectric
nanosurfaces imprint information onto an incident field by spatially
varying the field's phase and/or amplitude deterministically using
strongly scattering objects. The highest efficiency is achieved if these
scattering objects are made from low-loss high-permittivity materials.
If operated at their duality point, perfect transmission is achieved.
This unlocks a plethora of application in lighting and imaging devices,
ultra-thin display technologies, for wavefront manipulation, and beam
shaping.

However, the
ability to control light disruptively comes at the expense of a
pronounced long-range interaction in the surface plane. This limits the
information density if these scatterers are arranged periodically on the
surface.

In our
project, we aim to improve the information capacity encoded into a
nanosurface by introducing tailored disorder in the arrangement and the
parameters of the scatterers on the surface. We aim to maximize the
number of channels that can be encoded with the same area of the
nanosurface and the information density encoded in each channel.

Our project comprises three research strands:

1. We
   explore wavefront-shaping nanosurfaces where the information density is
   enhanced by explicitly exploiting disorder. The disorder is spatially
   tailored to adjust the local amplitude and phase of the transmitted
   light. This full control within a single material layer will be used to
   implement high-definition holograms. We aim to exploit the
   spectral/angular dispersive response to implement holograms at different
   wavelengths/illumination fields.
2. We
   will use disorder to tailor the diffusive scattering in selected
   demonstrators. We will study devices that redirect the incident light in
   a continuous fashion and probe to which extent a nanosurface can mimic
   the response from an ordinary 3D random medium.

## Contributors

Prof. Isabelle Staude

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Prof. Carsten Rockstuhl

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Prof. Thomas Pertsch

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Aso Rahimzadegan

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Dennis Arslan

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Najmeh Abbasirad

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## References

- M.
  I. Abdelrahman. C. Rockstuhl, I. Fernandez-Corbaton, Broadband
  suppression of backscattering at optical frequencies using low
  permittivity dielectric spheres. Scientific Reports 7, 14762 (2017)
- D.
  Arslan, K. E. Chong, A. Miroshnichenko, D.-Y. Choi, D. Neshev, T.
  Pertsch, Y. S. Kivshar I. Staude, Angle-selective all-dielectric
  Huygens' metasurfaces. J. Phys. D: Appl. Phys. 50, 434002 (2017)
- M.
  Decker, T. Pertsch, I. Staude, Strong Coupling in hybrid
  metal-dielectric nanoresonators. Phil. Trans. R. Soc. A 375, 20160312
  (2017)
- S.
  Fasold, S. Linß, T. Kawde, M. Falkner, M. Decker, T. Pertsch, I.
  Staude, Disorder-enabled pure chirality in bilayer plasmonic
  metasurfaces. ACS Photonics, Article ASAP, DOI:
  10.1021/acsphotonics.7b01460 (2018)
- R.
  Guo, E. Rusak, I. Staude, J. Dominguez, M. Decker, C. Rockstuhl, I.
  Brener, D. N. Neshev, Y. S. Kivshar, Multipolar coupling in hybrid
  metal-dielectric metasurfaces. ACS Photonics 3, 349 (2016)
- R.
  Alaee, M. Albooyeh, M. S. Mirmoosa, Y. S. Kivshar, C. Rockstuhl,
  All-dielectric reciprocal bianisotropic nanoantennas. Phys. Rev. B 92,
  245130 (2015)
- M.
  Odit, P. Kapitanova, P. Belov, R. Alaee, C. Rockstuhl, Y. Kivshar,
  Experimental realisation of all-dielectric bianisotropic metasurfaces.
  Appl. Phys. Lett. 108, 221903 (2016)
- R.
  Alaee, C. Rockstuhl, I. Fernandez-Corbaton, An electromagnetic
  multipole expansion beyond the long-wavelength approximation. Opt.
  Commun. 407, 17 (2018)

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