Porous silicon-based rugate filters
Applied Optics, Vol. 44, Issue 26, pp. 5415-5421 (2005)
http://dx.doi.org/10.1364/AO.44.005415
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Abstract
We report an experimental study of porous silicon-based rugate filters. We performed filter apodization, following a half-apodization approach, which successfully attenuated the sidelobes at both sides of the photonic stop band. We achieved successful reduction of interference ripples through the insertion of index-matching layers on the first and last interfaces. An apodized dielectric mirror and a rugate filter are compared: Appreciable differences in the harmonic presence and stop-band performance were observed and are commented on. Bandwidth control when index contrast is modified is also demonstrated. Finally, the possibility of combining different rugate filter designs to attain more complex responses is demonstrated by the achievement of a multi-stop-band filter. Numerical calculations for design optimization and comparison with experimental data are reported too.
© 2005 Optical Society of America
OCIS Codes
(160.6000) Materials : Semiconductor materials
(220.1230) Optical design and fabrication : Apodization
(220.4610) Optical design and fabrication : Optical fabrication
(230.4170) Optical devices : Multilayers
(350.2460) Other areas of optics : Filters, interference
Citation
Eduardo Lorenzo, Claudio J. Oton, Néstor E. Capuj, Mher Ghulinyan, Daniel Navarro-Urrios, Zeno Gaburro, and Lorenzo Pavesi, "Porous silicon-based rugate filters," Appl. Opt. 44, 5415-5421 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-26-5415
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