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Development of ultrahigh densiti photon mode optical storage by nearfield optical technology

利用近场光学技术开发超高密度光子模式光存储

基本信息

批准号：
07555012
负责人：
OHTSU Motoichi
金额：
$ 7.23万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555012/
关键词：
memory near-field probe fiber microscope

项目摘要

Highly sensitive probe was fabricated for storage and readout. This was by the two-step chemical etching of a fiber to form a double-taperedsharpened core. By this, probe, efficiency of optical near-fieldgeneration and/or detection was improved more than 10 times. Derivative oiasobenzene, i.e., a sensitive photochromic material, was used for optical storage medium. Its thin film was coated on a slide glass by LB method Storage was carriedout by trans-cis transition by irradiating ultraviolet light (350nm wavelength) from an Ar laser. Typical time for storagee was 8 s when the powerdensity was 100 W/cm^2. Reas out was carried out by observing the local change of transmission due to this transition by using a near-field optical microscope. Diameter of a circularly stored pit was 50-100 nm, which was ten times smaller than that of a conventional storage. After the readout, the stored pit was erasec by irradiating a longer wavelengthlight, from which a reliable storage-readout-erassing was confirmed. More effeictive use of size-dependend locality of the optical near field was proposed for hither storage density. For this use, a method of high density deposition of a Latex sphere was developed, on which the LB film was coated Based on theoretical estimation for data transmission capcity, required high efficiency probe was fabricated To meed this requirement, surface plasmon mode was excited on the top of the probe tip by shapening the core in an assymetricmanner. As a result, efficiency of generating optical near-field was improved 10-100 times, from which data transmission rate higher them 100 Mbit//s was confirmed.

制作了用于存储和读出的高灵敏探头。这是通过对纤维进行两步化学蚀刻，形成双锥形磨尖的芯子。这样，探头、光学近场产生和/或检测的效率提高了10倍以上。衍生化邻苯是一种灵敏的光致变色材料，用于光存储介质。用LB法在载玻片上镀膜，用Ar激光照射波长为350 nm的紫外光进行跨顺跃迁存储。当功率密度为100W/cm2时，典型的存储时间为8 S。利用近场光学显微镜观察了这种转变引起的局部透射率的变化。圆形储存坑的直径为50-100 nm，比常规储存坑的直径小10倍。在读出后，通过照射较长波长的光来擦除存储的凹坑，由此确定了可靠的存储-读出-擦除。建议更有效地利用光学近场的尺寸相关的局部性来获得更高的存储密度。为此，开发了一种高密度沉积乳胶球的方法，在其上涂覆了基于数据传输能力的理论估计的LB膜，制作了满足这一要求的高效率探头，通过不对称地整形芯部在探头顶端激发表面等离子体激元模式。结果表明，光近场的产生效率提高了10-100倍，数据传输速率提高了100Mbit//S。