A physical model of an annular-aperture solid immersion lens (SIL) is proposed, and its attractive features are presented numerically with the finite-difference time-domain method. Placing an appropriate annular aperture in front of the SIL shows that the focal depth can evidently be improved, combining the virtues of the annular-aperture technique and the SIL technique. With this proposed method the rigorous distance control condition in related devices can be relaxed, preventing scratches or collisions between the optical head and the recording medium. Potentially, this technique could have great prospects for applications in optical data recording, lithography, and other applications that depend on immersion media to meet the resolution criteria across the image field.
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A study on the realization of high resolution solid immersion lens-based near-field imaging optics by use of an annular aperture.
Opt Express
August 2010
Center for Information Storage Device, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Korea.
We report on the realization of solid immersion lens (SIL)-based near-field (NF) optics with an annular aperture, which is targeted to achieve high optical resolution. A numerical aperture (NA) = 1.84 hemisphere SIL-optics with an annular aperture achieves higher optical resolution than the conventional NA = 2.
View Article and Find Full Text PDFCover-layer-protected solid immersion lens-based near-field recording with an annular aperture.
J Opt Soc Am A Opt Image Sci Vis
August 2009
Center for Information Storage Device, Yonsei University, Seoul, Korea.
Currently, data recording density in cover-layer-protected near-field-recording (NFR) and multiple-recording layered NFR optical data storage technology is limited by the difficulty in obtaining high-refractive-index cover layer materials. In addition, with the exception of improved resolution, the higher the numerical aperture (NA), the poorer the optical characteristics. However, in this study, we present novel cover-layer-protected solid immersion lens (SIL)-based NFR optics that provide superior optical performance with higher recording density, greatly enhanced focal depth, and less sensitivity to near-field air-gap-distance variation by modulating the amplitude and phase in the entrance pupil using annular pupil zones.
View Article and Find Full Text PDFFeasibility study of the application of radially polarized illumination to solid immersion lens-based near-field optics.
Opt Lett
July 2009
Center for Information Storage Device, Yonsei University, Department of Mechanical Engineering, Seoul, Korea.
Article Synopsis
- The study investigates the interaction of radially polarized light with a solid immersion lens (SIL) setup, focusing on how it affects the electric field in the focal plane.
- It finds that radially polarized light produces smaller beam spots than circularly polarized light when projected onto the SIL's bottom surface, though it leads to broader spots on the measurement sample due to a stronger transverse electric field.
- The use of an annular aperture can minimize the transverse electric field effects, thereby enhancing resolution for applications in near-field optical storage, microscopy, and high-resolution lithography.
Numerical analysis of an annular-aperture solid immersion lens.
Opt Lett
August 2004
National Research Laboratory of Nonlinear Optics, Yonsei University, Seoul 120-749, South Korea.
A physical model of an annular-aperture solid immersion lens (SIL) is proposed, and its attractive features are presented numerically with the finite-difference time-domain method. Placing an appropriate annular aperture in front of the SIL shows that the focal depth can evidently be improved, combining the virtues of the annular-aperture technique and the SIL technique. With this proposed method the rigorous distance control condition in related devices can be relaxed, preventing scratches or collisions between the optical head and the recording medium.
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