Progress in Nano-Electro Optics III: Industrial Applications and Dynamics of the Nano-Optical System / Edition 1

by Motoichi Ohtsu

Overview

Near-field 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-field optical head, which is a key device for near-field optical recording. First, we explained the technical issues regarding the near-field optical head and introduced some solutions to these issues. We focused on a highly efficient near-field optical head that uses a wedge-shaped metallic plate, and described its optical pr- erties based on a simulation using afinite-difierence time-domain method. The simulation results confirmed that a strong optical near field 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- field 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 efficiency 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 confirmed through our simulation that a highly localized optical near field 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.

Product Details

ISBN-13:	9783540210504
Publisher:	Springer Berlin Heidelberg
Publication date:	11/29/2004
Series:	Springer Series in Optical Sciences , #96
Edition description:	2005
Pages:	224
Product dimensions:	6.10(w) x 9.25(h) x 0.02(d)

About the Author

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.

Table of Contents

Near-Field Optical Fiber Probes and the Imaging Applications.- A Novel Method for Forming Uniform Surface-Adsorbed Metal Particles and Development of a Localized Surface-Plasmon Resonance Sensor.- Near-Field Optical-Head Technology for High-Density, Near-Field Optical Recording.- Nano-Optical Media for Ultrahigh-Density Storage.- A Phenomenological Description of Optical Near Fields and Optical Properties of N Two-Level Systems Interacting with Optical Near Fields.