Progress in Nano-Electro Optics III

1. Front Matter

   Pages I-XIV

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2. Near-Field Optical Fiber Probes and the Imaging Applications

   • S. Mononobe

   Pages 1-55

3. A Novel Method for Forming Uniform Surface-Adsorbed Metal Particles and Development of a Localized Surface-Plasmon Resonance Sensor

   • H. Takei, M. Himmelhaus

   Pages 57-92

4. Near-Field Optical-Head Technology for High-Density, Near-Field Optical Recording

   • T. Matsumoto

   Pages 93-126

5. Nano-Optical Media for Ultrahigh-Density Storage

   • K. Naito, H. Hieda, T. Ishino, K. Tanaka, M. Sakurai, Y. Kamata et al.

   Pages 127-144

6. A Phenomenological Description of Optical Near Fields and Optical Properties of N Two-Level Systems Interacting with Optical Near Fields

   • A. Shojiguchi, K. Kobayashi, S. Sangu, K. Kitahara, M. Ohtsu

   Pages 145-220

7. Back Matter

   Pages 221-226

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Near-?eld optical recording is a promising way to realize a recording density 2 of over 1 Tb/in . In this chapter, we focused on the near-?eld optical head, which is a key device for near-?eld optical recording. First, we explained the technical issues regarding the near-?eld optical head and introduced some solutions to these issues. We focused on a highly e?cient near-?eld optical head that uses a wedge-shaped metallic plate, and described its optical pr- erties based on a simulation using a ?nite-di?erence time-domain method. The simulation results con?rmed that a strong optical near ?eld is generated at the apex of the metallic plate when a plasmon is excited in the metallic plate. When a TbFeCo recording medium was placed 10 nm from the ne- ?eld optical head, the size of the optical spot was 30 nm, which corresponds 2 to an areal recording density of approximately 1 Tb/in . The e?ciency was 20% if we assume that the incident beam was a Gaussian beam with a full width at half-maximum of 1µ m. Furthermore, we discussed an optical head using two metallic plates. We con?rmed through our simulation that a highly localized optical near ?eld was generated at the gap when the plasmon was excited in the metallic plates. The distribution was 5 nm by 5 nm when the two apices were separated by 5 nm.

• Electro-optics
• Nanotechnology
• Near-field optics
• Photonics
• basics
• nanophotonics
• optics
• spectroscopy

• Department of Electronics Engineering School of Engineering, The University of Tokyo, Tokyo, Japan

  Motoichi Ohtsu

Dr. M. Ohtsu is currently a professor of Tokyo Institute of Technology. He is also a project leader of SORST Nanophotonics Team, Japan Science and TechnologyAgency. He has been a president of IEEE LEOS Japan Chapter. He has also been a member of the board of directors, Japan Society of Applied Physics. He is a fellow of Optical Society of America.

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