Design of photonic bands for opal-based photonic crystals
| Autor: | Juan F. Galisteo-López, Elisa Palacios-Lidón, Beatriz H. Juárez, Cefe López, Florencio Garcia-Santamaria, Dolores Golmayo |
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| Rok vydání: | 2004 |
| Předmět: |
Thin layers
Materials science business.industry Band gap Physics::Optics Heterojunction Condensed Matter Physics Waveguide (optics) Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Optics Hardware and Architecture Optoelectronics Electrical and Electronic Engineering Photonics business Electronic band structure Electron-beam lithography Photonic crystal |
| Zdroj: | Photonics and Nanostructures - Fundamentals and Applications. 2:117-125 |
| ISSN: | 1569-4410 |
| Popis: | To make a device from an opal—or otherwise—the photonic bands and the optical properties derived from them are needed. Knowing the effects of different parameters defining the opal geometry and different possible modifications of its structure are needed, too. An accurate definition of the device will be required to obtain a good performance. With this aim, the optics of light with a wavevector in the vicinity of the L point in the Brillouin zone and its coupling to bare opals band structure are presented. An important aspect is the transition from finite to infinite crystal and the study of size effects on the bands. It is possible to substantially alter the photonic band structure of an opal-based system, while maintaining the lattice structure, simply by growing layers of other materials with an appropriate refractive index. Here, it is shown how, by the growth of accurately controlled thin layers of silicon and germanium, and further processing, one can induce the opening of two complete photonic band gaps (PBGs) in an opal structure. Finally, the possibility to fabricate a simple device consisting in a planar waveguide will be shown. By means of a very simple and inexpensive procedure, engineered planar defects acting as microcavities have been realized. These can be viewed as a particular case of a much more general class of heterostructures that can be grown by combining opal vertical deposition and chemical vapour deposition of oxides. A further step is made by applying electron beam lithography to provide lateral definition and facilitate three-dimensional structuring. # 2004 Published by Elsevier B.V. |
| Databáze: | OpenAIRE |
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