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Short-range wireless terahertz (THz) communication and ultrafast THz interconnects require switches and modulators. Here, we experimentally show voltage-bias superconducting (SC) niobium nitride (NbN) metamaterial to realize a switch. The obtained maximum transmission coefficient at 0.507 THz is up to 0.98 and it drops to 0.19 when the applied voltage is only increased to 0.9 V. A relative transmittance...
In this paper, we demonstrate a metamaterial tunable filter with liquid metal, which can be tuned by changing the air pressure within the channels. In experiment, it measures a 3.3-GHz tuning range for the tunable metmaterial unit with the working wavelength of 11.27 GHz. The tuning of 9 × 9 unit array is demonstrated. Different from traditional metamaterials, the metal patterns of the tunable metamaterial...
We present a systematic study of different sonicated cold development scenarios for the purpose of achieving high density optical metamaterial. High aspect ratio sub-15-nm dots at pitch as small as 40 nm are successfully demonstrated for 110-nm thick resist at low exposure dose. Some of the key results include sub-15-nm gold nanodots at 40-nm pitch and high density optical metamaterial (with only...
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...
From semiconductor quantum well structures to the currently hottest metamaterials, the conquest of nano-world has been occurring in almost every field of research. In the field of quantum well structures for infrared photodetection, the inclusion of dilute nitride layers in the mature GaAs based quantum well structures results in a TE dominate photocurrent and the incorporation of nitrogen in the...
A novel realisable dual composite right/left-handed (D-CRLH) coplanar waveguide (CPW) transmission line (TL) in GaAs MMIC technology demonstrated by theoretical analysis and experimental results is presented. A D-CRLH TL is the dual of the conventional CRLH TL in the sense that it consists of series LC parallel tanks and shunt LC series tanks. However, an ideal D-CRLH TL cannot be realised because...
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