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Laterally Graded Rugate Filters in Porous Silicon

Published online by Cambridge University Press:  01 February 2011

Sean E. Foss  and
Terje G. Finstad
Sean E. Foss
Affiliation:
Department of Physics, University of Oslo, POBox 1048 Blindern, 0316 Oslo, Norway
Terje G. Finstad
Affiliation:
Department of Physics, University of Oslo, POBox 1048 Blindern, 0316 Oslo, Norway
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Abstract

Rugate optical reflectance filters with position dependent reflectance peaks in the visible to near infrared spectrum were realized in porous silicon (PS). Filters with strong reflection peaks, near 100%, no detectable higher order harmonics and suppressed sidebands compared to discrete layer filters were obtained by varying the current density continuously and periodically during etching. An in-plane voltage up to 1.5 V was used to obtain refractive index and periodicity change along the filter surface resulting in reflectance peak shifts of up to 100 nm/mm in the direction of the voltage drop. The effect of the lateral change in optical parameters on the filter characteristics is studied by varying the gradient and comparing measurements at different positions with measurements on a non-graded filter. We have observed extra features in the reflectance spectrum of these graded filters compared with reflectance from a non-graded filter which is likely caused by the gradient.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 797: Symposium W – Engineered Porosity for Microphotonics and Plasmonics , 2003 , W1.6
Copyright
Copyright © Materials Research Society 2004

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References

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