A planar solid immersion mirror with a dual offset grating used to focus a waveguide mode onto a near-field transducer. The electric field for the TE mode is shown, which generates a longitudinal (along z direction) field at the focus. XYZ is a right-handed Cartesian coordinate system with XZ parallel to and Y normal to the waveguide plane. The near-field transducer is placed in the top cladding layer. (a) XZ plane view of the PSIM and NFT. (b) XY plane view of the planar waveguide and NFT.
Contours of transverse (a) and longitudinal component (b) of electric field amplitude through the middle plane of the core layer at focus of a PSIM. The dashed rectangle outlines the transducer. Note that the electric field amplitude has been multiplied by λ and the total optical power incident on the PSIM is 1 W.
Expanded view of the transducer showing its vertical position with respect to the recording medium in XZ plane (a) and its transverse position in the dielectric waveguide in YZ plane (b). HMS—head-medium spacing.
NFT efficiency as a function of waveguide core thickness, NFT-core spacing, patch width, and height.
NFT coupling efficiency and field intensity. (a) Efficiency versus wavelength. (b) Profile of electric field intensity within the center of the recording at the resonant wavelength. Note that the electric field intensity has been multiplied by λ2 and the incident optical power in the waveguide is 1 W.
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