Light struck head, information-storing device, light struck head design device and light struck head design procedure

Abstract

A light projection head having a large size and a high light propagation performance. The light projection head comprises a first propagation section made of a first low-attenuation material and disposed along the optical axis, a pair of second propagation sections sandwiching the first propagation section and made of a second low-attenuation material, a first confinement section composed of members having a propagation performance inferior to that of the second propagation section and sandwiching the first and second propagation sections from the outside of the second propagation sections, a pair of third propagation sections made of a material having a propagation performance superior to that of the first confinement sections and sandwiching the first confinement sections from outside. A light projection head designing device for penetratingly designing a light projection head by solving an equation based on an F matrix and calculating the complex propagation constant along the optical axis is also disclosed.

Description

technical field [0001] The present invention relates to a photoirradiation head that propagates and irradiates light, and an information storage device using the photoirradiation head. Background technique [0002] With the development of information society, the amount of information is increasing day by day. In response to an increase in the amount of information, there is a desire for an information recording method with a remarkably high recording density and a recording / reproducing device based on the recording method. [0003] As a recording method for realizing high-density recording, the following optical recording method is attracting attention, that is, a microscopic opening smaller than the wavelength of the incident light is created, and light emitted from the opening is used to form a light beam smaller than the wavelength of the light. point. [0004] As a conventional micro opening used in the phosgene recording method, for example, an opening provided at th...

AI Technical Summary

Problems solved by technology

However, according to the existing structure, it is difficult to design a photoirradiation head capable of efficiently propagating light to a size large enough to allow margins in manufacturing and processing. Therefore, it is required to manufacture a head that can provide high light propagating performance even if the size is relatively large. Structure

In addition, when designing the multilayer structure of this kind of light irradiation head, the method of correcting the thickness of each layer while confirming the light interference between the layers through simulation has been used in the past, so the design efficiency is very low, and a more forward-looking approach is desired. design device

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