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Proceedings Paper

Design and fabrication of two-dimensional hexagonal photonic crystals with a linear waveguide in erbium doped GeO2-Bi2O3-PbO-TiO2 glasses
Author(s): L. F. Avila; J. M. P. Almeida; M. S. Gonçalves; P. S. Valle; M. Nalin; C. R. Mendonça; L. Cescato
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Paper Abstract

In this work, we designed and recorded two-dimensional Hexagonal Photonic Crystals (2D-HPC) layers, with a linear waveguide, in erbium doped GeO2-Bi2O3-PbO-TiO2 glassy films, by combining the techniques of holographic recording and femtosecond (fs) laser micromachining. The 2D-HPC is recorded holographically in a photoresist film coated on a glass substrate by exposing the sample to the same interference pattern twice and rotating the sample of 60° between the exposures. After the development a two dimensional hexagonal array of photoresist columns remain on the glass substrate. The recording of the waveguide is made by a fs laser micromachining system focused at sample surface. The laser spot produces the ablation of the photoresist columns generating a defect line in the periodic hexagonal array. After the recording of the photoresist template, the erbium doped GeO2-Bi2O3-PbO-TiO2 film is evaporated on the photoresist and finally the photoresist template is removed using acetone. The design of the geometrical parameters of the 2D-HPC is performed by calculation of the dispersion mode curves of the photonic crystal using a 2D finite element method. The proper geometrical parameters depend on both the refractive index of the glass film and thickness. Such parameters as well as the period of the 2D-HPC have been defined in order to obtain a photonic band gap in the region of erbium luminescence band. In such condition the erbium luminescence will propagate only through the waveguide.

Paper Details

Date Published: 3 May 2013
PDF: 7 pages
Proc. SPIE 8776, Holography: Advances and Modern Trends III, 87760L (3 May 2013); doi: 10.1117/12.2018734
Show Author Affiliations
L. F. Avila, Univ. Estadual de Campinas (Brazil)
J. M. P. Almeida, Univ. de São Paulo (Brazil)
M. S. Gonçalves, Univ. Estadual de Campinas (Brazil)
P. S. Valle, Univ. Federal de São Carlos (Brazil)
M. Nalin, Univ. Federal de São Carlos (Brazil)
C. R. Mendonça, Univ. de São Paulo (Brazil)
L. Cescato, Univ. Estadual de Campinas (Brazil)

Published in SPIE Proceedings Vol. 8776:
Holography: Advances and Modern Trends III
Miroslav Hrabovský; John T. Sheridan; Antonio Fimia-Gil, Editor(s)

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