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In an even more
cutting-edge
pursuit, other researchers have been able to replace the
silica in a diatom shell with other materials such as
magnesium.
"By replacing the silica with a metal, you might be
able to combine electrical and optical properties in the
same device," Hildebrand said.
Currently Hildebrand has one interested patron. The U.S. Air Force has
provided some funding for a study of optical properties in diatom shells,
an example of what are called "photonic bandgap materials."
They possess the ability to route light by blocking some wavelengths,
and allowing others to pass through their structure. Fiber-optic materials,
which transmit information by converting it through pulses of light, are
also made of glass but absorb 70 percent of the light. The porous three-dimensional
structure of diatoms enables routing of light with only two percent absorption.
The diatom structures are too small to create better
optical cable, but they could be ideal for creating
ultrasensitive sensors. On a computer circuitry scale,
they could prove a boon to computer chip makers looking
for more efficient ways to move information across
nanometer-sized spaces.
"Although the downsizing of chips by the semiconductor industry has enhanced
our information storage and processing capability, there are limits to
the amount of information that can be processed using electrons," Hildebrand
said. "Light can carry a lot of information, which is why optical circuitry
is seen as the major paradigm shift in this technology."
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