THz Hybrid Metamaterial-Liquid Crystal Based Structures with Large Tunability

Chikhi, N.; Lisitskiy, M.; Molis, G.; Urbanovic, Andzej; Andreone, A.

doi:10.1007/978-94-017-8572-3_1

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…Under THz radiation, this hybrid metamaterial shows a limited frequency shift of the electromagnetic response when the LC is polarised 25 , and at the same time a low field confinement around the gaps area, which translates in a relatively strong signal crosstalk between adjacent cells (see Fig. 1(b,c) respectively).…”

Section: Resultsmentioning

confidence: 99%

A hybrid tunable THz metadevice using a high birefringence liquid crystal

Chikhi

Lisitskiy

Papari

et al. 2016

Sci Rep

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We investigate a hybrid re-configurable three dimensional metamaterial based on liquid crystal as tuning element in order to build novel devices operating in the terahertz range. The proposed metadevice is an array of meta-atoms consisting of split ring resonators having suspended conducting cantilevers in the gap region. Adding a “third dimension” to a standard planar device plays a dual role: (i) enhance the tunability of the overall structure, exploiting the birefringence of the liquid crystal at its best, and (ii) improve the field confinement and therefore the ability of the metadevice to efficiently steer the THz signal. We describe the design, electromagnetic simulation, fabrication and experimental characterization of this new class of tunable metamaterials under an externally applied small voltage. By infiltrating tiny quantities of a nematic liquid crystal in the structure, we induce a frequency shift in the resonant response of the order of 7–8% in terms of bandwidth and about two orders of magnitude change in the signal absorption. We discuss how such a hybrid structure can be exploited for the development of a THz spatial light modulator.

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Section: Resultsmentioning

confidence: 99%

A hybrid tunable THz metadevice using a high birefringence liquid crystal

Chikhi

Lisitskiy

Papari

et al. 2016

Sci Rep

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First steps towards an innovative compressive sampling based-THz imaging system for early crack detection on aereospace plates

Angrisani

Bonavolontà

Moriello

et al. 2014

2014 IEEE Metrology for Aerospace (MetroAeroSpace)

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The paper deals with the problem of early detecting cracks in composite materials for avionic applications. In particular, the authors present a THz imaging system that exploits compressive sampling (CS) to detect submillimeter cracks with a reduced measurement burden. Traditional methods for THz imaging usually involve raster scan of the issue of interest by means of highly collimated radiations and the corresponding image is achieved by measuring the received THz power in different positions (pixels) of the desired image. As it can be expected, the higher the required resolution, the longer the measurement time. On the contrary, two different approaches for THz imaging (namely, continuous wave and time domain spectroscopy) combined with a proper CS solution are used to assure as good results as those granted by traditional raster scan; a proper set of masks (each of which characterized by a specific random pattern) are defined to the purpose. A number of tests conducted on simulated data highlighted the promising performance of the proposed method thus suggesting its implementation in an actual measurement setup

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THz Hybrid Metamaterial-Liquid Crystal Based Structures with Large Tunability

Cited by 2 publications

References 15 publications

A hybrid tunable THz metadevice using a high birefringence liquid crystal

A hybrid tunable THz metadevice using a high birefringence liquid crystal

First steps towards an innovative compressive sampling based-THz imaging system for early crack detection on aereospace plates

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