초록 ▼

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 transmis

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.

대표청구항 ▼

An electrooptic apparatus for measuring a characteristic of an electrical signal comprising: a multiple quantum well structure comprising substantially semi-insulating semiconductor material; first and second coplanar transmission lines positioned over said multiple quantum well structure; means for

An electrooptic apparatus for measuring a characteristic of an electrical signal comprising: a multiple quantum well structure comprising substantially semi-insulating semiconductor material; first and second coplanar transmission lines positioned over said multiple quantum well structure; means for contacting a fixed electrical potential between said first and second coplanar transmission lines; means for illuminating by an optical beam a region between said first and second coplanar transmission line that substantially includes said multiple quantum well structure; and means for injecting said electrical signal between said coplanar transmission lines, said multiple quantum well structure responsive to variations in amplitude of said electrical signal for modulating a characteristic of said optical beam to produce a modulated optical beam.