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Switchable-superconducting-mirrors

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Switchable superconducting mirrors

Details

Inventors: Hed, Aharon Z.;
Assignee: International Superconductor Corp. (Riverdale, NY)
Primary Examiner: Arnold; Bruce Y.
Assistant Examiner: Ben; Loha
Attorney, Agent or Firm: Dubno; Herbert

Switchable superconducting mirrors and reflectors are switched from the reflective to the absorbing, and/or transparent, modes to modulate signals.

DETAILED DESCRIPTION I claim: 1.
A reflection apparatus, comprising: a source of electromagnetic radiation emitting a beam of photons of a given wavelength corresponding to a given energy; a superconducting mirror having a reflective surface in a path of said beam and having charge carrying pairs with a respective optical binding energy, said given wavelength being greater than a wavelength at which the photon energy is equal to said optical binding energy, whereby at temperatures below a critical temperature of the superconducting mirror corresponding to a superconductive mode, said surface is reflective to said beam, and the superconducting mirror can be quenched to a nonsuperconductive mode to extinguish reflection of said beam by said surface; and means operatively coupled to said superconducting mirror for selectively quenching said superconducting mirror to said nonsuperconductive mode.
2.
The reflection apparatus defined in claim 1, wherein said mirror comprises a substrate and said surface is formed by a layer of superconductive material deposited on said substrate to a thickness greater than a superconductor magnetic field penetration depth of said superconductive material.
3.
The reflection apparatus defined in claim 1, wherein said mirror is a self supporting body of a superconductive material.
4.
The reflection apparatus defined in claim 1, wherein said mirror is composed of a superconductive material which is at least partially transparent to said beam in said nonsuperconductive mode.
5.
The reflection apparatus defined in claim 1, wherein said mirror is composed of a superconductive material which is opaque to said beam in said nonsuperconductive mode.
6.
The reflection apparatus defined in claim 1, wherein said means operatively coupled to said superconducting mirror for selectively quenching said superconducting mirror to said nonsuperconductive mode includes means for applying a magnetic field to said mirror at said surface in excess of a critical magnetic field at an operating temperature of the mirror

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