Room temperature high efficiency heterodyne THz QW detector based on quantum coherence

Details Room temperature high efficiency heterodyne THz QW detector based on quantum coherence Room temperature high efficiency heterodyne THz QW detector based on quantum coherence

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..mar.r1258j&link_type=abstract

American Physical Society, APS March Meeting, March 5-9, 2007, abstract #R1.258

Physics

Optics

Scientific paper

THz devices are used for Earth's (and other planets) atmospheric remote sensing, astronomical investigation of interstellar dust medium, and life detection instruments for in-situ probing of the planet's surfaces. As the radio astronomy science community demands observations at higher THz frequencies, there is a technology development push for high power tunable THz sources, high efficiency room temperature heterodyne detectors that need low power local oscillators, and high dynamic range near-quantum-noise-limit detectors. THz technology gap is being filled up by traditional optics and microwave communities. Quantum coherence promises to be the enabling technology in many technical areas [including Electromagnetically Induced Transparency (EIT) based magnetometer, all optical switch, single photon counter, quantum computer, micro-K laser cooling). Quantum coherence phenomena have been demonstrated successfully in select (gaseous) atoms, and in few (crystalline) solids. We will discuss a heterodyne THz QW detector device based on quantum coherence with prospects of performing near-quantum-noise-limit at room temperature with high quantum efficiency, where the need for high power THz source is eased, and phase-matching is no longer restrictive. THz down-conversion concept via closed-loop four-wave-mixing will be discussed.

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