An apparatus for producing a phase shift in a beam of electromagnetic radiation

An apparatus is provided for producing a phase shift in a beam of electromagnetic radiation. The apparatus includes a first layer (2) of a dielectric material, and a second layer (4) of an electrically conductive and thus highly reflective material parallel to the first layer and separated from the...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	DAVID JOHN GIBBONS, PETER ALAN JEFFORD
Format:	Patent
Sprache:	eng
Schlagworte:	ANTENNAS, i.e. RADIO AERIALS BASIC ELECTRIC ELEMENTS DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING ELECTRICITY FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	An apparatus is provided for producing a phase shift in a beam of electromagnetic radiation. The apparatus includes a first layer (2) of a dielectric material, and a second layer (4) of an electrically conductive and thus highly reflective material parallel to the first layer and separated from the first layer by a gap. A layer (6) of a liquid crystal material is positioned between the first layer (2) and the second layer (4). When a potential difference is applied across the liquid crystal layer (6) the refractive index of the liquid crystal material is changed. The change in the refractive index of the liquid crystal material effects a change in the phase shift produced in the beam of radiation emitted from the apparatus.