Terahertz light apparatus
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United States of America Patent
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Issued Date -
Oct 7, 2004
app pub date -
Feb 27, 2004
filing date -
Sep 21, 2001
priority date (Note) -
Abandoned
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Abstract
A terahertz light generation element 8 emits terahertz light as excitation pulse light is emitted onto an area between electrically conductive films 32 and 33 formed on a substrate 31 while a bias voltage is applied between the electrically conductive films 32 and 33. A terahertz light detection unit 13 outputs an electrical signal corresponding to the intensity level of the electric field of the terahertz light entering the terahertz light detection unit. The polarity of the electric field of the terahertz light is modulated by inverting the polarity of the bias voltage applied between the pair of electrically conductive films. By using a reference signal synchronous with the polarity inversion of the bias voltage applied between the pair of electrically conductive films, the electrical signal provided by the terahertz light detection unit 13 is amplified at a lock-in amplifier 24.
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