Patent ID: 6873165

Claim:
A near-field probe driven by a short laser pulse delayed through an optical delay-line for detecting vectors of near-field components of electrical signals propagating through a device under test including an electrical device or an electronic circuit based on a sampling principle, comprising: a photoconductive switch assembly including a thin semiconductor photoconductive body, at least two separated switch electrodes formed on the thin semiconductor photoconductive body, and an electrode gap formed between the two separated switch electrodes; and an optical waveguide attached to one side of the photoconductive switch assembly by using an optical adhesive, wherein the optical waveguide is partially coated with conductive material on the outer surface thereof, wherein the conductive material forms at least two stripe electrodes in the longitudinal direction of the optical waveguide, and the stripe electrodes are electrically connected to each other with the switch electrodes and a core of the optical waveguide is optically aligned with the electrode gap.