Organics-Based Phase Modulator for Terahertz Detection up to 1.25 THz

We present a three-dimensional phase modulator at telecom wavelength acting as a Terahertz detector with an electrooptic bandwidth of 1.25 Terahertz. The detector exploits the r₃₃ coefficient in the organic chromophore-host mixture JRD1:PMMA. With an interaction length of only 4 μm, it is sensitive to fields equivalent to few photons only.