title: One-mode model for patterned metal layers inside integrated color pixels.
abstract: Optimized design of the optical filters inside integrated color pixels (ICPs) for complementary metal-oxide semiconductor image sensors requires analytical models. ICP optical filters consist of subwavelength patterned metal layers. We show that a one-mode model, in which subwavelength gaps in the metal layer are described in terms of single-mode waveguides, suffices to predict the salient features of measured ICP wavelength selectivity. The Airy-like transmittance formula, derived for transverse-electric polarization, predicts an angle-independent cutoff wavelength, which is in good agreement with predictions made with a two-dimensional finite-difference time-domain method.
authors.affiliation: Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA. pcatryss@stanford.edu
authors.forename: Peter B
authors.initials: PB
authors.lastname: Catrysse
authors.forename: Wonjoo
authors.initials: W
authors.lastname: Suh
authors.forename: Shanhui
authors.initials: S
authors.lastname: Fan
authors.forename: Michael
authors.initials: M
authors.lastname: Peeters