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Antenna Produces High-Energy Terahertz Radiation

Photonics Spectra
Apr 2002
Researchers from the University of Electrocommunications in Tokyo and NEC Corp. in Kanagawa, Japan, have produced terahertz radiation with an energy density of 10 µJ/cm2 from a photoconductive semiconductor antenna.

Using 0.5-ps pulses from a 248-nm, 10-mJ KrF laser system, the team produced the high energy density by inducing coherently added emissions from more than 2000 photoconductive gaps on the chip. A chemical vapor-deposited film provided a threshold breakdown in the gaps high enough for an electric field stress of 2 x 106 V/cm to be applied.

The team, reporting in the Dec. 20 issue of Applied Optics, predicted that, by using a higher laser intensity, electric field and emission area, a focused intensity of several hundred megawatts per square centimeter may soon be achieved.

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