General:
Book:Name: Ohtsu M Progress in Nano-Electro Optics III Industrial Applications 2005
Format: pdf
Size: 26.81 MB
Description:Title: Progress in Nano-Electro Optics III: Industrial Applications and Dynamics of the Nano-Optical System
Author: Motoichi Ohtsu (Editor)
Language: polski
Year: 2004
Subjects: Science & Technology, Engineering, Technology, Electrical & Electronic Engineering, Engineering Technology, Applied Science, Technology - General & Miscellaneous, Chemistry, Physics, Physics of Light, Electronics - Microelectronics, Microscopes & Microscopy - General & Miscellaneous, Nanotechnology, Physical & Theoretical Chemistry, Physics of Light - Optics, Solid State Physics - General & Miscellaneous, Optics - General & Miscellaneous, Electrooptics
Publisher: Springer Berlin Heidelberg
ISBN: 9783540210504
Total pages: 237
Download from RapidGatorNear-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.
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