The effect of absorption losses on the optical behaviour of macroporous silicon photonic crystal selective filters
The effect of losses in photonic crystal structures on transmittance and reflectance has been studied by numerical techniques, and compared to fabricated macroporous silicon samples. Material absorption and tolerances of the pores play an essential role determining performance in optical application...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/86283 |
| Acceso en línea: | https://hdl.handle.net/2117/86283 https://dx.doi.org/10.1109/JLT.2015.2503354 |
| Access Level: | acceso abierto |
| Palabra clave: | Photonic crystals Silicon Macroporous Silicon Silicon photonics Electrochemical etching Optical losses Cristalls fotònics Silici -- Propietats òtiques Àrees temàtiques de la UPC::Ciències de la visió::Òptica física |
| Sumario: | The effect of losses in photonic crystal structures on transmittance and reflectance has been studied by numerical techniques, and compared to fabricated macroporous silicon samples. Material absorption and tolerances of the pores play an essential role determining performance in optical applications. The relevance of the structure geometry has been investigated through the porosity. The considered photonic crystals in this work are 3-d macroporous silicon structures fabricated by electrochemical etching with pore profile modulation, and defect inclusion. The examined structures are intended to work with quasi-normal light incidence as selective filters. The effect of losses on the forbidden band and resonance is studied and reported for both transmittance and reflectance. The reflectance peak is less affected by losses, while transmitted light experiences a noticeable reduction even for small absorption factors. This has critical implications for the performance of these structures as transmission filters. Furthermore, it is shown that an optimum can be found for a given absorption coefficient by choosing the appropriate porosity. |
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