Apparatus and method for measuring the time evolution of carrier

Details Apparatus and method for measuring the time evolution of carrier Apparatus and method for measuring the time evolution of carrier

1989-01-30

1991-07-23

Lall, Parshotam S.

Boots, shoes, and leggings

324158R, 250311, G01N 23225

Patent

active

050349031

ABSTRACT:
An apparatus for determining and displaying the time evolution profile of electron carriers present within a submicron or micron device comprises a laser for generating a beam of ultrafast pulses of ultraviolet light. A first beam splitter splits each pulse into a transmitted beam and a reflected beam. The transmitted beam travels through a time delay circuit, and is then converted into a train of ultrafast electrical pulses which are transmitted to the device. The reflected beam is focused on the device. An electron detector, also focused on the device, collects the ejected electrons resulting from the interaction of the light pulse and electrical pulse to produce an electrical signal. The signal is then magnified in intensity by an amplifier and directed at a cathode ray tube to cause an image to appear thereon. A SIT vidicon camera converts the image into an electrical signal and transmits the signal to a computer. The computer generates a time evolution profile from the signal received which is sent to a monitor for display.

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