Refractive index contrast in porous silicon multilayers
Por:
Nava R., De La Mora M.B., Tagüeña-Martínez J., Del Río J.A.
Publicada:
1 ene 2009
Categoría:
Condensed Matter Physics
Resumen:
Two of the most important properties of a porous silicon multilayer for photonic applications are flat interfaces and a relative large refractive index contrast between layers in the optical wavelength range. In this work, we studied the effect of the current density and HF electrolyte concentration on the refractive index of porous silicon. With the purpose of increasing the refractive index contrast in a multilayer, the refractive index of porous silicon produced at low current was studied in detail. The current density applied to produce the low porosity layers was limited in order to keep the electrolyte flow through the multilayer structure and to avoid deformation of layer interfaces. We found that an electrolyte composed of hydrofluoric acid, ethanol and glycerin in a ratio of 3:7:1 gives a refractive index contrast around 1.3/2.8 at 600 nm. Several multilayer structures with this refractive index contrast were fabricated, such as dielectric Bragg mirrors and microcavities. Reflectance spectra of the structures show the photonic quality of porous silicon multilayers produced under these electrochemical conditions. © 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Filiaciones:
Nava R.:
Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Privada Xochicalco s/n, A. P. 34, 6250, Temixco, Morelos, Mexico
De La Mora M.B.:
Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Privada Xochicalco s/n, A. P. 34, 6250, Temixco, Morelos, Mexico
Tagüeña-Martínez J.:
Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Privada Xochicalco s/n, A. P. 34, 6250, Temixco, Morelos, Mexico
Del Río J.A.:
Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Privada Xochicalco s/n, A. P. 34, 6250, Temixco, Morelos, Mexico
Centro Morelense de Innovación y Transferencia Tecnológica, Consejo de Ciencia y Tecnología del Estado de Morelos, Camino Temixco a Emiliano Zapata, s/n km 0.3, col. Palo Escrito, 62760, Emiliano Zapata, Morelos, Mexico
Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Mexico
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