Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1989-06-26
1990-12-18
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
324158R, 324158D, 324 77K, 357 30, 357 4, G01R 3100, H01L 2714
Patent
active
049789104
ABSTRACT:
An electrooptic measuring apparatus having both high voltage sensitivity and femtosecond time resolution includes coplanar transmission lines fabricated on a semi-insulating multiple quantum well structure. An electrical signal, such as from a high speed electronic device, injected onto the transmission lines creates an electrical field parallel to the layer planes of the multiple quantum well structure. Excitonic electroabsorption by the multiple quantum well structure, in response to the parallel field, changes the transmissivity of the multiple quantum well structure. An external light beam directed through the multiple quantum well structure is modulated by the changes in transmissivity. By detecting this modulation, a sampling of the electrical signal is achieved.
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Miller et al., Physical Review B, vol. 32, No. 2, 1985, "Electric Field Dependence of Optical . . . ", pp. 1043-1060.
Valdmanis et al., IEEE J. of Quantum Elec., vol. QE-22, No. 1, 1986, "Subpicosecond Electrooptic Sampling: Principles . . . ", pp. 69-78.
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Knox Wayne H.
Miller David A. B.
AT&T Bell Laboratories
de la Rosa John G.
Eisenzopf Reinhard J.
Nguyen Vinh P.
Ranieri Gregory C.
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