Hole arrays metallic filters can be made independent to polarization at normal incidence. However they may lose this property for a non-normal incidence, being dependent to both polar and azimuthal incident angles. These variations of the filter characteristics according to light orientation and polarization are not desirable for most optical applications. Yet, for specific geometric parameters, high-stability can be obtained for cruciform-holes Ag-SiO₂ filters. In this article, we propose a review of cross-holes metallic filters, working with CMOS-compatible materials in the visible range. We find out the main geometrical parameters impacting the filters sensitivity to the incident angles and polarization and link their role to spectral stability. We give proper design rules to realize stable filters which may lead to optical sensors with very low spectral variations whatever the incidence and the polarization of the source.

Date Published: 11 September 2013
PDF: 7 pages
Proc. SPIE 8809, Plasmonics: Metallic Nanostructures and Their Optical Properties XI, 88092J (11 September 2013); doi: 10.1117/12.2023601

Published in SPIE Proceedings Vol. 8809:
Plasmonics: Metallic Nanostructures and Their Optical Properties XI
Mark I. Stockman, Editor(s)