Optical irradiation head and information...

Details Optical irradiation head and information... Optical irradiation head and information...

2005-08-16

2005-08-16

Young, W. R. (Department: 2652)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112090

Reexamination Certificate

active

06930975

ABSTRACT:
An optical irradiation head including a trapezoidal prism having a pair of trapezoidal principal surfaces parallel to each other, a rectangular bottom surface, a rectangular top surface parallel to the rectangular bottom surface, and a pair of oblique side surfaces connecting the top surface, the bottom surface, and the principal surfaces, and a cover member for covering the principal surfaces and the oblique side surfaces. The trapezoidal prism is formed of a first material, and the cover member is formed of a second material. Linearly polarized light having a polarization direction perpendicular to the principal surfaces is incident on the bottom surface. For example, the first material is a dielectric transparent to the incident light, and the second material is metal such as Al, Au, or Ag.

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Yatsui et al., “Plasmon Waveguide for Optical Far/Near-Field Conversion,” Applied Physics Letters, vol. 79, No. 27, Dec. 31, 2001, pp. 4583-4585.
Kim et al., “Fabrication of Micro-Pyramidal Probe Array with Aperture for Near-Field Optical Memory Applications,” Japanese Journal of Applied Physics, vol. 39, (2000), pp. 1538-1541.
Increasing throughput of a near-field optical fiber probe over 1000 times by the use of a triple-tapered structure, Applied Physics Letters, vol. 73, No. 15, pp. 2090-2092 (Oct. 12, 1998).
Fabrication of a Near-Field Optical Fiber Probe with a Nanometric Metallized Protrusion, Optical Review, vol. 5, No. 6, pp. 369-373 (1998).

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