Growth and Characteristics of ZnTe Single Crystal for THz Technology

ZnTe single crystals were grown perfectly by employing the Te-solution method.X-ray diffraction was introduced to investigate the crystals,and 〈110〉 oriented crystals of 10mm×10mm size were obtained.The transmittance is about 61% in range of 2.5 ~20mm,as measured with a Fourier Transform Infrared spectrometer.The visible and near-infrared spectrum show that the ZnTe band-gap is about 2.24eV.Moreover,a THz pulse was emitted and detected on a ZnTe single crystal by means of a femto-second Ti:sapphire amplifier system.The THz radiation signal has a pulse width of about 0.18ps and frequency bandwidth of 5THz.