IWNET12
IWNET12
Heat transfer in nanostructured dielectric mirrors
D. Estrada Wiese1, J.A del Río1, M.B. de la Mora2, F. Vázquez3
1 Centro de Investigación en Energía, Universidad Nacional Autónoma de México, México
2 Instituto de Física, Universidad Nacional Autónoma de México, México
3 Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, México
Abstract
Perfect mirrors are usually called the dielectric mirrors because of their high reectivity. Multilayers of
alternating periodic refraction index conform the structure of these mirrors. The light that propagates in these
structures interacts with its periodic refractive index, that generates wavelength gaps of forbidden transmission.
If these structures are fabricated with ideal materials we obtain ideal mirrors or lters. However most of the
materials present absorption but in these dielectric mirrors the absorption is almost negligible. In this work
the heating of nanoestructured dielectric mirrors because of absorption was measured using a thermographic
technique. We present experimental results of comparing the temperature evolution after sunlight hits dierent
metallic and dielectric mirrors. The dielectric mirrors were fabricated with multilayers of porous silicon a
nanoestructured material. We discuss the temperature evolution through heat transport in a multilayers system.
E-mail: antonio@unam.mx

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