Terahertz Detection Using Optical Parametric Upconversion and Geiger Mode Avalanche Photodiodes

摘要

Terahertz radiation is nonlinearly upconverted to telecommunication wavelength. The resulting idler is coupled into fiber and detected with a photon counting receiver. Detection with 4.5 pW/Hz{sup}(1/2) noise equivalent power and nanosecond temporal resolution is demonstrated.