PT Unknown AU Kuznetsov, KA Kornienko, VV Vakhtomin, YB Pentin, IV Smirnov, KV Kitaeva, GK TI Generation and detection of optical-terahertz biphotons via spontaneous parametric downconversion SE Proc. ICLO PY 2018 BP 303 DI 10.1109/LO.2018.8435659 DE NbN HEB applications AB We study spontaneous parametric downconversion (SPDC) in the strongly non-degenerate regime when the idler wave hits the terahertz range. By using the hot-electron bolometer, for the first time the SPDC-generated idler-wave photons were directly detected in the terahertz frequency range. Spectrum of corresponding signal photons was measured using standard technique by the CCD camera. Possible applications of correlated optical-terahertz biphotons are discussed. ER