Abstract:

In past decades, extensive efforts have been focused on terahertz wave generation, transportation and detection, little was done on control and manipulation of THz radiation. In fact, techniques to control and manipulate THz wave (for example, amplitude and phase modulation, frequency filtering etc) are also important for the practical application of THz wave in future. Ultrafast photonics group in shanghai university focused on THz wave generation and coherent control. We develop two methods to manipulate the THz wave, one is active control, and the other is passive control. In this talk, I would like to introduce our study on the THz wave active control: THz generation and phase modulation in periodically poled lithium niobate (PPLN) crystal; we demonstrate the observation of magnetic field induced THz wave phase flip in photorefractive PPLN crystal. After that, I would like to introduce our preliminary results on the passive control on THz wave: By designing proper structure, we can realize THz wave antireflection, frequency filtering etc.
 
 
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