title: Efficient band-pass color filters enabled by resonant modes and plasmons near the Rayleigh anomaly.
abstract: We design and fabricate efficient, narrow-band, transmission color filters whose operating principle resides in a narrow-band guided-mode resonance associated with a surface-plasmon resonance. The fundamental device consists of an aluminum grating over a 200-nm-thick aluminum oxide film on a glass substrate. Numerical simulations show a sharp resonance-derived spectral profile that is additionally shaped by a neighboring Rayleigh anomaly. Besides the Rayleigh effect, we show numerically that the narrow bandwidth is predominantly due to the low refractive-index contrast between the waveguide film and the substrate. Red, green, and blue filters are fabricated using ultraviolet holographic lithography followed by a lift-off process. The experimental spectral efficiency in transmission exceeds 80% with full-width-at-half-maximum linewidths near 20 nm. We provide color images of the zero-order transmitted spectra, and illustrate the pure colors associated with the modal resonance extracted as side-coupled output light.
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Mazulquim
authors.forename: Kyu Jin
authors.initials: KJ
authors.lastname: Lee
authors.forename: Jae Woong
authors.initials: JW
authors.lastname: Yoon
authors.forename: Leone V
authors.initials: LV
authors.lastname: Muniz
authors.forename: Ben-Hur V
authors.initials: BH
authors.lastname: Borges
authors.forename: Luiz G
authors.initials: LG
authors.lastname: Neto
authors.forename: Robert
authors.initials: R
authors.lastname: Magnusson