Abstract
We report on the fabrication and characterization of a porous silicon omnidirectional reflector formed by periodic substructures stacked together. For these substructures, a low refractive index contrast has been used, resulting in substructures without omnidirectional reflectivity band. The use of a low refractive index contrast involves the reduction of the requirements to obtain omnidirectional reflectors. We demonstrate the existence of an omnidirectional reflectivity range with a high gap-to-midgap ratio by means of reflectivity spectra measurements for a range of incidence angles. The results are in good agreement with a theoretical model of the reflector. The fabricated structure is the first reported porous silicon reflector suitable for 1.55 μm applications.
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Xifré-Pérez, E., Marsal, L.F., Ferré-Borrull, J. et al. Low refractive index contrast porous silicon omnidirectional reflectors. Appl. Phys. B 95, 169–172 (2009). https://doi.org/10.1007/s00340-009-3416-0
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DOI: https://doi.org/10.1007/s00340-009-3416-0