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Proceedings Paper

Finite difference analysis and experimental validation of 3D photonic crystals for structural health monitoring
Author(s): Valentina Piccolo; Andrea Chiappini; Alessandro Vaccari; Antonino Calà Lesina; Maurizio Ferrari; Luca Deseri; Marcus Perry; Daniele Zonta
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Paper Abstract

In this work, we validate the behavior of 3D Photonic Crystals for Structural Health Monitoring applications. A Finite Difference Time Domain (FDTD) analysis has been performed and compared to experimental data. We demonstrate that the photonic properties of a crystal (comprised of sub-micrometric polystyrene colloidal spheres embedded in a PDMS matrix) change as a function of the axial strain applied to a rubber substrate. The change in the reflected wavelength, detected through our laboratory experiments and equivalent to a visible change in crystal color, is assumed to be caused by changes in the interplanar spacing of the polystyrene beads. This behavior is captured by our full wave 3D FDTD model. This contains different wavelengths in the visible spectrum and the wave amplitudes of the reflected and transmitted secondary beams are then computed. A change in the reflectance or transmittance is observed at every programmed step in which we vary the distance between the spheres. These investigations are an important tool to predict, study and validate our understanding of the behavior of this highly complex physical system. In this context, we have developed a versatile and robust parallelized code, able to numerically model the interaction of light with matter, by directly solving Maxwell's equations in their strong form. The ability to describe the physical behavior of such systems is an important and fundamental capability which will aid the design and validation of innovative photonic sensors.

Paper Details

Date Published: 12 April 2017
PDF: 9 pages
Proc. SPIE 10168, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2017, 101681E (12 April 2017); doi: 10.1117/12.2263975
Show Author Affiliations
Valentina Piccolo, Univ. degli Studi di Trento (Italy)
Univ. of Pittsburgh (United States)
Andrea Chiappini, Consiglio Nazionale Delle Ricerche (Italy)
Alessandro Vaccari, Fondazione Bruno Kessler (Italy)
Antonino Calà Lesina, Univ. of Ottawa (Canada)
Maurizio Ferrari, Consiglio Nazionale Delle Ricerche (Italy)
Luca Deseri, Univ. degli Studi di Trento (Italy)
Univ. of Pittsburgh (United States)
Brunel Univ. London (United Kingdom)
Marcus Perry, Univ. of Strathclyde (United Kingdom)
Daniele Zonta, Univ. degli Studi di Trento (Italy)
Consiglio Nazionale Delle Ricerche (Italy)
Univ. of Strathclyde Glasgow (United Kingdom)

Published in SPIE Proceedings Vol. 10168:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2017
Jerome P. Lynch, Editor(s)

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