title: High-performance and highly stable 0.3-nm-full-width-at-half-maximum interference optical filters.
abstract: Fabrication of very-narrow-bandpass optical tunable filters [(0.3 nm full width at half-maximum) (FWHM)] is reported. To improve the film densities, the O(2) ion-assisted deposition-method is used in the fabrication. In the succession of high- and low-refractive-index layers, the commonly used TiO(2) material is replaced by Ta(2)O(5), which suits the ion-assisted fabrication technique. The relative thicknesses of the filter multilayer structure of 1/2/1 are modified to 0.998/2.007/0.998, which reduces the shift difference in the central wavelengths with regard to the p and s polarizations when the filter is tilted. These improvements enabled fabrication of 0.3-nm-FWHM optical tunable filters with improved stability characteristics.
authors.forename: T
authors.initials: T
authors.lastname: Yanagimachi
authors.forename: H
authors.initials: H
authors.lastname: Oguri
authors.forename: J
authors.initials: J
authors.lastname: Nayyer
authors.forename: S
authors.initials: S
authors.lastname: Ishihara
authors.forename: J
authors.initials: J
authors.lastname: Minowa