Sub-terahertz on–off switch based on a two-dimensional photonic crystal infiltrated by liquid crystals

Ghattan, Z.; Hasek, T.; Wilk, R.; Shahabadi, Mahmoud; Koch, Martin

doi:10.1016/j.optcom.2008.05.041

Cited by 76 publications

(31 citation statements)

References 20 publications

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“…Zhang and coworkers reported recently on a tunable THz photonic crystal [45]. Our group furthermore demonstrated a LC-based dielectric THz-mirror and a sub-THz photonic crystal [46,47]. Moreover, Khoo et al suggested a tunable THz device, which combines a metamaterial with liquid crystals [48][49][50].…”

Section: State Of the Artmentioning

confidence: 80%

Liquid Crystals and their Applications in the THz Frequency Range

Vieweg

Jansen

Koch

2012

Terahertz Spectroscopy and Imaging

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We present a survey through the study of liquid crystals with terahertz time domain spectroscopy. The macroscopic dielectric properties such as the refractive index and the absorption coefficient for both ordinary and extraordinary polarization of various liquid crystals are presented and the underlying physical mechanisms are discussed. Furthermore, we deduce the microscopic characteristics such as the order parameter and the polarizabilities from the measured data.

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Section: State Of the Artmentioning

confidence: 80%

Liquid Crystals and their Applications in the THz Frequency Range

Vieweg

Jansen

Koch

2012

Terahertz Spectroscopy and Imaging

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“…The bandwidth is only reduced by 0.04, which is quite different from that of dielectric PCs. As we know, in this case, the sizes of PBG of dielectric PCs will be significantly reduced [14] or even totally disappear [13] due to the decreasing difference of refractive indexes between the PC and the LC. Therefore, metallic PCs filled with LC can overcome the drawback of PBG reduction in dielectric PCs filled with LC.…”

Section: Metallic Photonic Crystal For a Tunable Band-pass Filtermentioning

confidence: 89%

“…Among these devices, photonic crystals (PCs) have proved to be an effective way to transmit and control THz waves [9][10][11]. PCs for high quality switching and filtering have been widely studied due to their potential applications [12][13][14]. For example, Ghattan et al [13] demonstrated the high density polyethylene (HDPE) PC with air holes filled with liquid crystal (LC) can be used as a switch for the sub-THz wave.…”

Section: Introductionmentioning

confidence: 99%

“…PCs for high quality switching and filtering have been widely studied due to their potential applications [12][13][14]. For example, Ghattan et al [13] demonstrated the high density polyethylene (HDPE) PC with air holes filled with liquid crystal (LC) can be used as a switch for the sub-THz wave. A magnetically tunable THz filter based on a photonic crystal waveguide composed of silicon rods filled with LC has also been proposed by Zhang et al [14].…”

Section: Introductionmentioning

confidence: 99%

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Metallic photonic crystals for terahertz tunable filters

Fan

Chang

2011

Sci. China Inf. Sci.

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We have investigated the photonic band gap and transmission properties of metallic photonic crystals (PCs) filled with liquid crystal (LC) in the terahertz region by using the finite element method and the finitedifference time-domain method. The calculations on the LC-filled metallic PC and metallic PC waveguide demonstrated that they can realize low-loss broadband terahertz tunable filters, which have a tunable range of about 110 GHz and extinction ratio larger than 35 dB. Moreover, the 3 dB bandwidths of the filters keep constant. The designed filters based on the metallic PC can greatly improve the performances in terms of loss, bandwidth and tunable region compared to those based on the LC-filled dielectric PC.

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“…It consists of a triangular lattice of air holes filled by the liquid crystal (LC) and operates as a switch at a certain frequency based on the dynamic shift of the photonic bandgaps [13]. Furthermore, Ghattan et al [14] confirmed experimentally that rotating the optical axis of the LC by applying an external electric field could considerably affect the transmission of the THz waves in the PBG. This result demonstrated that PCS filled with the LC can be used as an ON-OFF switch in the sub-THz range.…”

Section: Introductionmentioning

confidence: 99%

Terahertz switch and polarization controller based on photonic crystal fiber

Fan

Wang

et al. 2011

Sci. China Inf. Sci.

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Theoretical studies on liquid crystal filled photonic crystal fiber (LC-PCF) are presented. The effects of electric birefringence of liquid crystal (LC) in the LC-PCF and the transmitting properties of photonic crystal fiber (PCF) are investigated by using the full vector plane wave expansion and beam propagation method. The simulation results show that the electrically controlled LC-PCF can act as not only a terahertz (THz) switch with about 0.55 THz bandwidth, but also a tunable polarization controller for changing the polarization state of the fundamental mode.

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Sub-terahertz on–off switch based on a two-dimensional photonic crystal infiltrated by liquid crystals

Cited by 76 publications

References 20 publications

Liquid Crystals and their Applications in the THz Frequency Range

Liquid Crystals and their Applications in the THz Frequency Range

Metallic photonic crystals for terahertz tunable filters

Terahertz switch and polarization controller based on photonic crystal fiber

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