2018
DOI: 10.3390/app8122454
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Fast-Tunable Terahertz Metamaterial Absorber Based on Polymer Network Liquid Crystal

Abstract: This paper introduces a tunable metamaterial absorber (MA) based on polymer network liquid crystal (PNLC) in the terahertz (THz) frequency band. Under the optimal polymerization condition, through electrical control of the orientation of the PNLC embedded in the frequency selective surface, the resonant frequency of the absorber can be tuned from 416.5 to 405.0 GHz, corresponding to fractional frequency bandwidth of 2.8%. The experimental results show that the proposed MA based on the PNLC offers an adjustment… Show more

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Cited by 23 publications
(9 citation statements)
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“…According to some previous studies of our co-workers, the response time of LC-integrated devices includes two stages: the adjustment time (unbiased state to saturated state), which mainly depends upon the thickness of the LC layer and bias voltage, and the recovery time (saturated state to unbiased state), which is determined by the reorientation process of LC molecules and is related to the thickness of the LC layer. 42 In our design, the time for the two stages is in the order of 10 and 200 ms, respectively. However, if the second stage (free relaxation) can also be electrically driven, the response time can be largely reduced.…”
Section: Resultsmentioning
confidence: 99%
“…According to some previous studies of our co-workers, the response time of LC-integrated devices includes two stages: the adjustment time (unbiased state to saturated state), which mainly depends upon the thickness of the LC layer and bias voltage, and the recovery time (saturated state to unbiased state), which is determined by the reorientation process of LC molecules and is related to the thickness of the LC layer. 42 In our design, the time for the two stages is in the order of 10 and 200 ms, respectively. However, if the second stage (free relaxation) can also be electrically driven, the response time can be largely reduced.…”
Section: Resultsmentioning
confidence: 99%
“…Although a high modulation depth can be obtained through the combination, the response time of a conventional liquid crystal is long. To make full use of the high birefringence of a liquid crystal and improve the liquid crystal response time, Yin introduced a dynamic metamaterial absorber with a polymer network liquid crystal (PNLC) in 2018 [149]. The peak resonant frequency of the absorption spectra shows a shift by electrically controlling the direction of the PNLC embedded in the metamaterial.…”
Section: Liquid Crystal Metasurfacementioning
confidence: 99%
“…For the nematic liquid crystal device, the response time is composed of the rise time and the decay time. The rotation time can be greatly cut down by applying a large bias voltage (Yin et al, 2018). Compared with other tunable materials, the liquid crystal (LC) is continuously adjustable with lower operating voltage, low-cost and easy to fabricate large arrays.…”
Section: Introductionmentioning
confidence: 99%