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Time-resolved light propoagation at the band-edge states of 1D Fibonacci quasicrystals

Published online by Cambridge University Press:  01 February 2011

L. Dal Negro ,
C. J. Oton ,
Z. Gaburro ,
L. Pavesi ,
P. J. Johnson ,
A. Lagendijk  and
D. S. Wiersma
L. Dal Negro
Affiliation:
INFM and Department of Physics, University of Trento, Povo (TN), ITALY.
C. J. Oton
Affiliation:
INFM and Department of Physics, University of Trento, Povo (TN), ITALY.
Z. Gaburro
Affiliation:
INFM and Department of Physics, University of Trento, Povo (TN), ITALY.
L. Pavesi
Affiliation:
INFM and Department of Physics, University of Trento, Povo (TN), ITALY.
P. J. Johnson
Affiliation:
Van der Waals-Zeeman Institute, University of Amsterdam, Amsterdam, THE NETHERLANDS
A. Lagendijk
Affiliation:
Van der Waals-Zeeman Institute, University of Amsterdam, Amsterdam, THE NETHERLANDS
D. S. Wiersma
Affiliation:
European Laboratory of Nonlinear Spectroscopy, Florence, ITALY.
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Abstract

Infrared time-resolved interferometric transmission measurements have been performed on one dimensional porous silicon Fibonacci quasicrystals, obtained by electrochemical etching a p-type Si substrate, to address experimentally the problem of light transport and localization in deterministic aperiodic structures. Coherent beatings, pulse stretching and strong pulse delay on a picosecond time scale have been measured when the laser wavelength was tuned at the onedimensional band-edge of a 233-layers Fibonacci quasicrystal where quasi-localized states exist. The observation of these dramatic pulse distortion effects demonstrates the selective excitation of very-narrow localized optical modes. One dimensional transfer matrix and scattering states simulations yield the electromagnetic field distribution inside the structure and reproduce these experimental data supporting the general conclusion about the observation of quasi-localized photonics states.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 722: Symposia K/L – Materials and Devices for Optoelectronics and Photonics – Photonic Crystals-From Materials to Devices , 2002 , L6.9
Copyright
Copyright © Materials Research Society 2002

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