Near-field terahertz imaging

Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects

Reexamination Certificate

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C359S247000, C359S346000

Reexamination Certificate

active

07608827

ABSTRACT:
A T-ray imaging system employing an optical resonator that is adapted to be (i) positioned in the near-field proximity to a surface of a sample and (ii) pumped with pump light such that the pump light traverses a relatively thin layer of an electro-optically responsive material (EORM) located in the resonator's cavity. The imaging system has an optical detector that is adapted to detect at least a portion of the pump light reflected from the resonator, while the sample is illuminated with terahertz (THz) radiation such that the EORM is exposed to that radiation resulting in a detectable phase shift in the reflected pump light.

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“Laser Excess Noise Reduction in Optical Phase-Shift Measurements,” by O. Mitrofanov, Applied Optics, 2003, vol. 42, pp. 2526-2531.

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