In this paper, we propose a reconfigurable metasurface antenna for flexible scattering field manipulation using liquid metal. Since the Eutectic gallium indium (EGaIn) liquid metal has a melting temperature around the general room temperature (about 30 °C), the structure based on the liquid metal can be easily reconstructed under the temperature control. We have designed an element cavity structure to contain liquid metal for its flexible shape-reconstruction. By melting and rotating the element structure, the shape of liquid metal can be altered, resulting in the distinct reflective phase responses. By arranging different metal structure distribution, we show that the scattering fields generated by the surface have diverse versions including single-beam, dual-beam, and so on. The experimental results have good consistency with the simulation design, which demonstrated our works. The presented reconfigurable scheme may promote more interest in various antenna designs on 5G and intelligent applications.
Abstract-This paper presents an experimental study on the dispersion dependence of two-photon absorption (TPA) between 0.689~0.912 eV in a Si-base PIN photodiode. The obvious TPA process is clearly observed as the nonlinear enhancement of peak photoresponse on the incident light intensity in the power of 2. The tendency of the TPA coefficient increases with the incident photon energy increasing. The maximum enhancement factor of the TPA coefficient has been achieved as high as 4 times. This dispersion dependence of TPA has been qualitatively interpreted as when the photon energy increases, the electrons of valance band excited by TPA find an increasing availability states of conduction band by phonon assistance.
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