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	Superconducting devices
	-
	1973-05-31
著作权人	INTERNATIONAL BUSINESS MACHINES CORPORATION
专利号	GB1318819A
国家	英国
文献子类	授权发明
其他题名	Superconducting devices
英文摘要	1318819 AC Josephson effect devices INTERNATIONAL BUSINESS MACHINES CORP 19 April 1971 [2 March 1970 23 March 1970] 22702/71 Heading H1K A superconductor device comprises a Josephson junction arranged between a pair of electrodes which define a resonant cavity for radiation emitted by the junction by virtue of the AC Josephson effect. The electrodes may be of metal or semi-conductor material and the cavity is defined by the radiation penetration depth in the case of metal and by the depletion layer width in the case of semi-conductor material. When the electrodes are both of metal they are separated by a layer of insulation, e.g. silicon oxide or niobium oxide but when one or both electrodes are of semi-conductor material they may be indirect contact, the Schottky barrier depletion layer providing the electrical insulation. The position of the junction within the cavity determines the mode of operation and a plurality of junctions may be arranged between the same electrodes. Frequency modulation of the output radiation may be achieved when one or both electrodes are of semi-conductor material by varying the biasing voltage to change the width of the depletion layer and hence the width of the cavity. Alternatively the junction may be surrounded by two bodies of piezoelectric material or by a metal body and a body of piezoelectric material arranged to provide an extension of the cavity. Application of voltage to the piezoelectric body enables the effective length or width of the cavity to be varied. The Josephson junctions may be produced by spark erosion in a liquid He environment. For example if a spark is truck between a pointed probe and a block of GaAs, which is to form one electrode, a small region of Ga is produced to provide the junction. The second electrode is then applied for example by evaporation or sputtering. Alternatively the two electrodes may be shaped and placed in proximity, the sparks occurring at the closest points to form the junctions. The junctions may utilize a thin insulating layer instead of a weak link.
公开日期	1973-05-31
申请日期	1971-04-19
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/44707]
专题	半导体激光器专利数据库
作者单位	INTERNATIONAL BUSINESS MACHINES CORPORATION
推荐引用方式 GB/T 7714	-. Superconducting devices. GB1318819A. 1973-05-31.

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