Jpn. J. Appl. Phys. 45 (2006) pp. 1363-1365 |Previous Article| |Next Article| |Table of Contents|
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Novel Cover-Layer-Incident Dual-Layer Near-Field Recording Optics Using Hemispherical Solid-Immersion-Lens
Center for Information Storage Devices, Yonsei University, 134, Shinchon-Dong, Sudaemoon-Ku, Seoul, 120-749, Korea
(Received August 15, 2005; accepted December 19, 2005; published online February 24, 2006)
A novel for the design optics for using cover layer-incident dual-layer near-field recording (NFR) is proposed. Using two aplanatic positions of a hemispherical solid immersion lens (HMS), dual-layer NFR optics is designed and optimized. To achieve a high system numerical aperture (NA) of 1.45 for the dual recording layers, a prefocusing lens having NA of 0.7 and a solid immersion lens (SIL) with a refractive index of 2.086 are used. Critical spherical aberrations caused by variations in thickness and chromatic aberrations are effectively suppressed by zoom optics, an additional aspheric lens surface, and a diffractive optical element (DOE). The gap-induced aberration of the designed NFR optics is also investigated.
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