Researchers at the University of Nagoya in Japan have discovered a phenomenon called the photodielectric effect, which they think could be applied to the development of laser-controlled touch displays.
"A photo-capacitor provides a novel way for operating electronic devices with light," says Nagoya's Hiroki Taniguchi. "It will push the evolution of electronics to next-generation photo-electronics."
Taniguchi and colleagues made their discovery by experimenting with an intrinsic photodielectric effect in a ceramic by shining a light-emitting diode (LED) onto the ceramic and quantifying its dielectric permittivity, which rose even at high frequencies. However, unlike prior experiments that used the extrinsic photodielectric effect, the material exhibited solid insulation properties.
The researchers say this means the LED is directly changing the dielectric permittivity of the material, and not elevating conductance.
Taniguchi says it remains uncertain how the intrinsic photodielectric effect operates, but he thinks it may be related to defects in the material.
From EE Times Asia
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