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In this paper, a tunable THz lens array based on reconfigurable metamaterials is reported. The metamaterial consists with 40 × 40 liquid metal microdroplets, in which the shape is tuned under different air pressures. The droplets are formed by injecting the liquid mercury into a pre-designed microchannel network and arranged to focus incident THz wave. The focus spot size can be tuned with different...
The polarization of electromagnetic (EM) wave plays an essential role in the application of optoelectronics, life science microscopy and photographic display[1]. The conversion of EM wave in one polarized direction to its orthogonal direction is usually quite weak in natural materials. This paper presents a tunable metamaterial which rotates the polarized direction up to 20° in THz regime. The metamaterial...
In this paper, we demonstrate a metamaterial tunable filter with liquid metal, which can be tuned by adjusting the size and position of the air gap within the liquid metal. In experiment, it measures a 2.3 GHz tuning range for the tunable metmaterial unit with the working wavelength of 8.9 GHz. The tuning of 5 × 5 unit array is also demonstrated. Different from traditional metamaterials [1, 2], the...
This paper presents a MEMS switchable optical delay line, which works at terahertz (THz) region. The geometry of the unit cell is tunable by MEMS actuators [1]. In the experiment, it measures that the round trip time of the 5-µm silicon-metal cavity with the metamaterial slab is delayed by a factor of 100 when the gap of the metamaterial unit cell is shifted from 4 µm to 8 µm. Compared with the traditional...
This paper presents a THz dual mode switch realized by a proper designed MEMS switchable metamaterial. The switch simultaneously controls the reflection intensity of two optical resonant modes and thus switches the ON/OFF state at two resonant frequencies. The switchable output is defined as ON state when its reflection intensity is above 65%, and OFF state if below. Furthermore, the switching between...
This paper presents a terahertz tunable metamaterial filter using microelectromechanical systems (MEMS) structures. The metamaterial unit cells are tuned by micromachined comb-drive. The metamaterial slab works as a notch filter of THz region, which can lower the transmission of interest frequency down to -70 dB. In the experiment, it measures the tuning range of filter frequency from 3.32 to 3.80...
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