Efficient tunability and circuit model of nested-U nanoresonators in optical metasurfaces

Dehghani, Mojtaba; Pakizeh, Tavakol

doi:10.1080/09500340.2017.1382591

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…At 0.72 THz, a 50% relative intensity change of transmission is observed at a reverse gate bias of 16 V. Hence, this device could be used as a reasonably efficient narrowband THz switch/ modulator. Extensive reports are on the tunability of the resonance frequency of the metasurfaces by altering the period of the unit cells by stretching the substrate 230,[232][233][234][235][236][237][238] . The FTIR reflection spectra for an array of resonators on PDMS with a coupling distance of 60 nm are shown in Fig.…”

Section: Semiconductorsmentioning

confidence: 99%

Tunable and reconfigurable metasurfaces and metadevices

Nemati

Wang

Hong

et al. 2018

Opto-Electronic Advances

328

205

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Metasurfaces, two-dimensional equivalents of metamaterials, are engineered surfaces consisting of deep subwavelength features that have full control of the electromagnetic waves. Metasurfaces are not only being applied to the current devices throughout the electromagnetic spectrum from microwave to optics but also inspiring many new thrilling applications such as programmable on-demand optics and photonics in future. In order to overcome the limits imposed by passive metasurfaces, extensive researches have been put on utilizing different materials and mechanisms to design active metasurfaces. In this paper, we review the recent progress in tunable and reconfigurable metasurfaces and metadevices through the different active materials deployed together with the different control mechanisms including electrical, thermal, optical, mechanical, and magnetic, and provide the perspective for their future development for applications.

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Section: Semiconductorsmentioning

confidence: 99%

Tunable and reconfigurable metasurfaces and metadevices

Nemati

Wang

Hong

et al. 2018

Opto-Electronic Advances

328

205

View full text Add to dashboard Cite

show abstract

“…In order to explain the phenomenon by using the LC circuit model, it is necessary to calculate all equivalent circuit parameters. Based on the line capacitance theory [40,41], it is not difficult to obtain…”

Section: Physics Mechanismmentioning

confidence: 99%

“…, where x is the distance between two wires, and ω 0 is the width of the wire. If substitute the geometric parameters into formula (5) and fit the coefficient a [41], the capacitances C 1 , C 3 and C g can be calculated and the results are shown in table 2.…”

Section: Physics Mechanismmentioning

confidence: 99%

Tunable terahertz band-pass filter based on MEMS reconfigurable metamaterials

Jiang

Qian

et al. 2019

J. Phys. D: Appl. Phys.

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We present a tunable terahertz (THz) band-pass filter based on electrostatically actuated microelectromechanical systems reconfigurable metamaterials. The unit cell of the filter consists of a U-shaped structure and a fat-T shaped structure. The fat-T shaped structure connects with a movable frame which is actuated by two columns of electrostatic comb actuators. Initially, the filter has two passbands whose central resonance frequencies locate at 0.66 THz and 1.31 THz, respectively. When the actuators are biased with direct currents (DC) voltages, the fat-T shaped structures will move to the U-shaped structures. Thus, the transmition of the peak at 0.66 THz will decrease, and the modulation depth can reach 84.4%. Meanwhile, the resonance frequency of the high-frequency passband shows distinct blueshift, and the largest frequency shift arrives to 0.195 THz. The simulation results obtained from the finite-intergration-technology show that these two resonance peaks are produced by two LC resonators on the two arms and one resonator on the bottom of the U-shaped structure. A flinite element analysis method is introduced to study the electromechanical performance of the actuator, and a displacement of 4 µm is achieved at DC 120 V. The tunable THz band-pass filter can be applied in THz communication, THz frequency selection and THz sensing.

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Metasurfaces based on Functional Materials in THz and Optical Regions

Erfani-azad

Shahmirzadi

Pakizeh

et al. 2020

J. Phys.: Conf. Ser.

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In this paper we present the properties of metamaterials and metasurfaces composed of resonant micro/nano-structures in which their tunable electromagnetic (EM) properties can be achieved by employing the substrate or resonant structures consisting of functional materials such as polydimethylsiloxane (PDMS), Vanadium-dioxide (VO2), shape memory alloys (SMAs) or in general smart materials. Using a mechanical stretching PDMS substrate for a metasurface, reflectance and transmission of electromagnetic (EM) wave can be remarkably altered. Moreover, by employing resonators consists of Nitinol (NiTi) split ring resonators (SRR) which transforms to complete ring resonator (CRR) thermally, the resonance wavelength and its modal behaviour are affected. Furthermore, the chiroptical activity of planar optical metasurfaces composed of L-shape heterogeneous (Ag-VO2) dimer is studied as well. It is shown that by increasing temperature from room temperature to 81°C, the observed optical activity (OA) at 690 nm has been raised ∼ 50%, because of the occurred phase transition.

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Efficient tunability and circuit model of nested-U nanoresonators in optical metasurfaces

Cited by 5 publications

References 26 publications

Tunable and reconfigurable metasurfaces and metadevices

Tunable and reconfigurable metasurfaces and metadevices

Tunable terahertz band-pass filter based on MEMS reconfigurable metamaterials

Metasurfaces based on Functional Materials in THz and Optical Regions

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