Optical waveguides – With optical coupler – Switch
Patent
1997-08-14
1999-10-19
Ngo, Hung N.
Optical waveguides
With optical coupler
Switch
385147, 204242, 204290R, G02B 626
Patent
active
059701870
ABSTRACT:
A description is given of an electro-optical switching device (1) comprising a transparent substrate (3), a switching layer (5) of yttrium hydride as a first electrode, a palladium layer (7), an electrolyte layer of, e.g. Ta.sub.2 O.sub.5 (9), a layer of WO.sub.3 hydride as the second electrode (11), and a transparent ITO-layer (13). Under the influence of a potential difference or direct current between the electrodes (5) and (11), the yttrium hydride is electrochemically converted from a low-hydrogen-content state to a high-hydrogen-content state, or vice versa. The conversion between both compositions is reversible, and is accompanied by a change in optical transmission. Apart from Y, other trivalent metals may be used, such as Gd and La.
REFERENCES:
patent: 4240693 (1980-12-01), Johnson et al.
patent: 4245883 (1981-01-01), Johnson et al.
patent: 5635729 (1997-06-01), Griessen et al.
patent: 5699462 (1997-12-01), Fouquet et al.
Boonekamp Erik P.
Krings Leo H. M.
Notten Petrus H. L.
Van De Ven Johan
Fox John C.
Ngo Hung N.
U.S. Philips Corporation
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