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Ultrasensitive, Room Temperature Detection of THz Radiation Using Nonlinear Parametric Conversion

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4 Author(s)
Khan, M.J. ; Lincoln Lab., Massachusetts Inst. of Technol., Lexington, MA, USA ; Chen, J.C. ; Zong-Long Liau ; Kaushik, S.

We demonstrate ultrasensitive, room temperature optical detection of terahertz by using nonlinear parametric upconversion. Terahertz radiation is mixed with pump light at 1550 nm in quasi-phase-matched GaAs crystal to generate an optical sideband or idler wave that is coupled into optical fiber and detected using a Geiger-mode APD. The resulting terahertz detector has a noise equivalent power of 78 fW/Hz1/2 with a timing resolution of 1 ns.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:17 ,  Issue: 1 )