Abstract

We describe and demonstrate sensitive room-temperature detection of terahertz (THz) radiation by nonlinearly upconverting terahertz to the near-infrared regime, relying on telecommications components. THz radiation at $700\mathrm{GHz}$ is mixed with pump light at $1550\mathrm{nm}$ in a bulk GaAs crystal to generate an idler wave at $1555.6\mathrm{nm}$, which is separated and detected by using a commercial $\mathrm{p}\mathrm{\text{-}}\mathrm{i}\mathrm{\text{-}}\mathrm{n}$ diode. The THz detector operates at room temperature and has an intrinsic THz-to-optical photon conversion efficiency of 0.001%.

© 2007 Optical Society of America

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