Light-pulse propagation in Fibonacci quasicrystals

Year: 2005

Authors: Ghulinyan M., Oton CJ., Dal Negro L., Pavesi L., Sapienza R., Colocci M., Wiersma D.

Autors Affiliation: Univ Trent, Dept Phys, I-38050 Trento, Italy; INFM, I-38050 Trento, Italy;
Univ Florence, Dept Phys, I-50019 Florence, Italy;
Univ Florence, INFM, European Lab Nonlinear Spect, I-50019 Florence, Italy

Abstract: We report on an extensive study on light propagation in Fibonacci quasicrystals, with special focus on the optical states around the fundamental band gap of the structure. The samples are fabricated using free-standing porous silicon and experiments are performed using an ultrafast time-resolved transmission technique. Large pulse delays and pulse stretching are observed when exciting the band edge states of the Fibonacci structure. We carefully describe the various details concerning sample preparation and optical experiments. In particular, we highlight how optical path gradients related to technical limitations of the standard sample fabrication technique are responsible for a spatial confinement and intensity reduction of the narrow band edge states. However, band edge related pulse delay and stretching effects can still be observed experimentally in the time domain because the characteristic features originating from the quasiperiodic order are preserved. Experiments and numerical calculations are in good agreement. ©2005 The American Physical Society.

Journal/Review: PHYSICAL REVIEW B

Volume: 71 (9)      Pages from: 094204  to: 094204

KeyWords: Intensity correlation; Weak localization; Disordered medium; Wave-functions; Systems; Silicone, article; Calculation; Crystal; Crystal structure; Light; Light scattering; Mathematical computing; Optics; Structure analysis
DOI: 10.1103/PhysRevB.71.094204

Citations: 61
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