title: Cutoff wavelength of ridge waveguide near field transducer for disk data storage.
abstract: The electromagnetic eigenmodes of and light transmission through a C-aperture to the far field, and to a storage medium, have been studied based on the full vectorial finite difference method. It is found that the cutoff wavelength of C-aperture waveguides in a gold film is much longer than that in a perfect electric conductor, and the fundamental mode is confined in the gap and polarized with the electric field along the gap. The light transmission resonance through C-apertures to far field and to a storage medium occurs at wavelengths below the waveguide cutoff wavelength. Measurements on the fabricated C-apertures confirm the mode confinement and transmission resonance.
authors.affiliation: Seagate Technology, Pittsburgh, PA 15222, USA. Chubing.Peng@Seagate.com
authors.forename: Chubing
authors.initials: C
authors.lastname: Peng
authors.forename: Eric X
authors.initials: EX
authors.lastname: Jin
authors.forename: Thomas W
authors.initials: TW
authors.lastname: Clinton
authors.forename: Mike A
authors.initials: MA
authors.lastname: Seigler