US Government As Represented by the Secretary of the Army

Grace D Metcalfe

Michael Wraback

Paul H Shen

Xin Zhang

Richard Douglas Averitt

Kebin Fan

Andrew Strikwerda

A reflection-mode waveplate for operation in the terahertz region by shifting the phase between two perpendicular polarization components of the light wave, comprising a ground plane; an array of polygonal unit cells; the polygonal unit cells comprising a polymer positioned between the ground plane and the exterior of the array of polygonal patches.

Electromagnetic composite-based reflecting terahertz waveplate

A method and device for generating terahertz radiation comprising a polar crystal material layer operative to emit terahertz radiation; the polar crystal material layer comprising a plurality of stacking faults; the stacking faults lying substantially perpendicular to the polar axis and forming boundaries at which the internal electric polarization terminates leading to charges accumulating at the boundaries, and creation of internal electric fields oriented along the polar axis; a pulsed radiation source for creating photogenerated carriers in the polar crystal material; whereby the photogenerated carriers accelerate in the internal electric fields associated with the termination of the internal electric polarization by the stacking faults to thereby generate terahertz radiation.

Method and apparatus for enhanced terahertz radiation from high stacking fault density

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Bethesda, MD, United States of America

Grace D Metcalfe