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Greg Siskind on Immigration Law and Policy

IMMIGANT OF THE DAY: ALFRED CHO - INVENTOR

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If you used a cell phone today or listened to a CD, you probably have Alfred Cho to thank. The Chinese-born Cho was recently inducted in to the Inventors Hall of Fame which described his work as follows:

Alfred Cho is considered "the father of molecular
beam epitaxy," a process in which materials are layered atop one
another - at*om-by-atom within a vacuum  -- with great precision to
form devices like transistors and light-emitting diodes, or lasers. Cho
achieved many firsts with this technique, including producing the first
of several types of diodes and the first field effect transistor that
operates at microwave frequencies. The switches in cell phones that
carry our conversations over radio frequencies are made using molecular
beam epitaxy, as are most of the lasers used in CD/DVD players and
drives.

Because molecular beam
epitaxy can produce compounds that do not exist in nature, it is used
for research purposes as well, and as a real-world demonstration of
quantum physics to university students worldwide.


Cho
was born in Beijing, China and earned bachelor's, master's, and
doctorate degrees from the University of Illinois. His early work was
for Ion Physics Corp. and TRW Space Technology Labs. He joined Bell
Laboratories after completing his Ph.D. in 1968, where he ultimately
became Vice President of Semiconductor Research for Alcatel-Lucent's
Bell Labs. He is the recipient of many awards, including the National
Medal of Science and the National Medal of Technology.


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