Microscopically textured optical storage media
作者:
H. G. Craighead,
R. E. Howard,
期刊:
Applied Physics Letters
(AIP Available online 1981)
卷期:
Volume 39,
issue 7
页码: 532-534
ISSN:0003-6951
年代: 1981
DOI:10.1063/1.92805
出版商: AIP
数据来源: AIP
摘要:
A new optical information storage technique is described which operates by irreversibly altering the absorption properties of a microscopically textured surface. Reflectance changes of greater than a factor of 100 have been obtained by local melting of the surface. A random array of Si columns with cross‐sectional dimensions less than 100 nm, formed on a Si film by reactive ion etching, has a visible reflectance of less than 0.01. By irradiation with a focused laser beam, at a power density of ≲8 mW/&mgr;m2, the columns melt to form a surface with a specular reflectance of ∼0.4. The applicability of this surface structure as a permanent optical storage medium is discussed. In general, this surface texturing can be applied to a wide variety of materials with the advantages of increased sensitivity to the writing beam, large contrast between the written and unwritten areas and reduced lateral energy flow.
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