Cutoff wavelength of ridge waveguide near field transducer for disk data storage

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...

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Bibliographic Details
Published in:Optics express 2008-09, Vol.16 (20), p.16043-16051
Main Authors: Peng, Chubing, Jin, Eric X, Clinton, Thomas W, Seigler, Mike A
Format: Article
Language:English
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Summary: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.16.016043