Engineering 2D photonic disorder:
from incoherent transport to interference
effects.
Matteo Burresi
burresi@lens.unifi.it
The Color of Disorder
Cloud, snow, fog
Random systems are white
Randomness in nature?
Really?
Yin et al, PNAS (2012)
Noh et al, Adv. Mat. (2010)
Garcia, Adv. Mat. (2009)
Donev, Science (...
2D engineered-disordered
nanophotonic structures
Sapienza L., Science (2010)
Vynck K., Nature Mater. (2012)
Noh H., Phys. ...
2D correlated disorder
The point patterns
generated with the
Lubachevsky-Stillinger
algorithm.
M. Skoge, P.R. E (2006).
Wa...
Baus-Colot model and the modified SCS
A semi-analytical model to calculate the
structure factor valid in n-dimension.
We u...
Tuning transport: correlation and frequency
 Strong modifications at fixed frequency by varying the topology
 Pronounced...
Diffusion theory with the Baus-Colot model
and numerical calculations
Large deviation at the correlation frequency
Time-re...
Transition from quasi-extended
to localized regime
The mode volume of a localized state can be tuned by
controlling the de...
Take-home message
 Transport properties can be designed semi-analytically by
employing the Baus-Colot model;
 Large phot...
Acknowledgements
Kevin Vynck
Gora M. Conley
Filippo Pratesi
Diederik S. Wiersma
of 11

Nanophotonics Science Camp (29 08-13)

Published on: Mar 3, 2016
Published in: Science      Technology      Education      
Source: www.slideshare.net


Transcripts - Nanophotonics Science Camp (29 08-13)

  • 1. Engineering 2D photonic disorder: from incoherent transport to interference effects. Matteo Burresi burresi@lens.unifi.it
  • 2. The Color of Disorder Cloud, snow, fog Random systems are white
  • 3. Randomness in nature? Really? Yin et al, PNAS (2012) Noh et al, Adv. Mat. (2010) Garcia, Adv. Mat. (2009) Donev, Science (2004) Treacy, Science (2012) Amorphous Silicon Non-iridescent coloring Hard sphere
  • 4. 2D engineered-disordered nanophotonic structures Sapienza L., Science (2010) Vynck K., Nature Mater. (2012) Noh H., Phys. Rev. Lett. (2011) Redding B., Nature Photon. (2013) Quantum electrodynamics Random lasers Light harvesting Integrated spectrometer
  • 5. 2D correlated disorder The point patterns generated with the Lubachevsky-Stillinger algorithm. M. Skoge, P.R. E (2006). Wave transport in these disordered systems Transport mean free path Modified scattering cross-section (SCS) Structure factor S. Fraden, P.R.L. (1990). How to calculate it?
  • 6. Baus-Colot model and the modified SCS A semi-analytical model to calculate the structure factor valid in n-dimension. We use n=2. M. Baus and J. L. Colot, P.R. A (1987). Backward scattering dominate transport M. Conley et al, arXiv (2013).
  • 7. Tuning transport: correlation and frequency  Strong modifications at fixed frequency by varying the topology  Pronounced frequency response Not so white, is it?
  • 8. Diffusion theory with the Baus-Colot model and numerical calculations Large deviation at the correlation frequency Time-resolved 2D FDTD calculation of the electromagnetic field in a unbound systems Decay rate according to diffusion theory M. Conley et al, arXiv (2013).
  • 9. Transition from quasi-extended to localized regime The mode volume of a localized state can be tuned by controlling the degree of correlation Breakdown of diffusion theory due to localization effects Expected a dramatic spectral evolution of the localization length L=15a M. Conley et al, arXiv (2013).
  • 10. Take-home message  Transport properties can be designed semi-analytically by employing the Baus-Colot model;  Large photonic dispersion can be achieved. This leads to a promising control of the extension of localized modes.
  • 11. Acknowledgements Kevin Vynck Gora M. Conley Filippo Pratesi Diederik S. Wiersma