Tufts University
engineers have invented a chip-sized, high-speed modulator that operates at
terahertz (THz) frequencies and at room temperature at low voltages without
consuming DC power. The discovery could help fill the "THz gap" that
is limiting development of new and more powerful wireless devices that could
transmit data at significantly higher speeds than currently possible.
Measurements show the
modulation cutoff frequency of the new device exceeded 14 gigahertz and has the
potential to work above 1 THz, according to a paper published online in
Scientific Reports. By contrast, cellular networks occupy bands that are much
lower on the spectrum where the amount of data that can be transmitted is
limited.
The device works through
the interaction of confined THz waves in a novel slot waveguide with tunable,
two-dimensional electron gas. The prototype device operated within the
frequency band of 0.22-0.325 THz, which was chosen because it corresponded to
available experimental facilities. The researchers say the device would work
within other bands as well.
Although there is
significant interest in using the THz band of the electromagnetic spectrum,
which would enable the wireless transmission of data at speeds significantly
faster than conventional technology, the band has been underutilized in part
because of a lack of compact, on-chip components, such as modulators,
transmitters, and receivers.
"This is a very
promising device that can operate at terahertz frequencies, is miniaturized
using mainstream semiconductor foundry, and is in the same form factor as
current communication devices. It's only one building block, but it could help
to start filling the THz gap," said Sameer Sonkusale, Ph.D., of Nano Lab,
Department of Electrical and Computer Engineering, Tufts University, and the
paper's corresponding author.
Source: Science Daily
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