In recent decades, with the rapid development of terahertz generator and detector, more and more people are focus on the research of propagation of terahertz wave, one of which is terahertz modulator. Metasurface are engineered electromagnetic materials, which offered enormous opportunities and unprecedented functionalities to manipulate electromagnetic waves. Therefore, metasurface has earned considerable attention due to its potential applications in areas such as bio-sensing, compressive imagining and so on.
With the guidance of Professor Jianquan Yao and Furi Ling, Jie Ji et. al in the Wuhan National Laboratory for Optoelectronics investigated an active multifunctional terahertz modulator based on plasmonic metasurface under an external optical field at room temperature by time-domain terahertz spectroscopy. Experimental results showed a phenomenon infrared light induced blue shift on the both resonator with increasing optical powers. When the optical power was tuned to 400 mW, the amplitude tunability of transmission at transparency window reached to 34.01%. Moreover, the phase tunability of the transmission at 0.98 THz reached to 31.35%.
In Feb 4, 2019, the article ’’Active multifunctional terahertz modulator based on plasmonic metasurface’’ was published in Optics Express under the OSA. This work was supported by the National Natural Science Foundation of China (61735010, 61675147) and National Key Research and Development Program of China (2017YFA0700202).
Fig.1. Amplitude, phase and resonance frequency of the measured transmission of the metasurface in frequency spectra with different powers of the infrared light whose wavelength is 1064 nm.
