Near-field optical storage system using a solid immersion lens with a left-handed material slab

Area of Science:

• Optics
• Materials Science
• Data Storage Technologies

Background:

• Conventional solid immersion lenses (SILs) face limitations in achieving high storage densities and maintaining signal integrity with larger air gaps.
• Near-field optics offers potential for overcoming diffraction limits in optical data storage.

Purpose of the Study:

• To introduce and evaluate a new near-field optical storage system incorporating a left-handed material (LHM) slab.
• To compare the performance of the LHM-enhanced SIL system against a conventional SIL system.

Main Methods:

• Numerical simulations were employed to analyze and compare the optical storage system performance.
• The proposed system integrates an LHM slab with a conventional SIL.

Main Results:

• The LHM slab effectively images the focused spot from the SIL surface to the disc surface.
• The LHM-SIL system allows for a larger air gap, improving mechanical convenience.
• High signal contrast and storage density were maintained with the increased air gap.
• Improved tolerance to variations in the air gap was observed.

Conclusions:

• The integration of an LHM slab significantly enhances the performance of SIL-based optical storage systems.
• This LHM-SIL approach offers a practical solution for increasing storage density and operational flexibility in optical data storage.