Dynamically tunable electromagnetically induced reflection in terahertz complementary graphene metamaterials

Jiang, Jiuxing; Zhang, Qinfei; Ma, Qixiang; Yan, Shitao; Wu, Fengmin; He, Xiaodong

doi:10.1364/ome.5.001962

Cited by 77 publications

(27 citation statements)

References 24 publications

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“…Due to the interband transition of electrons in graphene, the photons of energy ħω > 2 E f for the guided mode will be absorbed by graphene, which hinders the generation of EIT-like spectrum. This mechanism is different from that of graphene plasmonic systems 51 . Here, the surface conductivity σ g of graphene can be derived according to the random-phase approximation in the local limit (see Methods section).…”

Section: Resultsmentioning

confidence: 69%

Flexibly tunable high-quality-factor induced transparency in plasmonic systems

Lü

Gan

Mao

et al. 2018

Sci Rep

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The quality (Q) factor and tunability of electromagnetically induced transparency (EIT)-like effect in plasmonic systems are restrained by the intrinsic loss and weak adjustability of metals, limiting the performance of the devices including optical sensor and storage. Exploring new schemes to realize the high Q-factor and tunable EIT-like effect is particularly significant in plasmonic systems. Here, we present an ultrahigh Q-factor and flexibly tunable EIT-like response in a novel plasmonic system. The results illustrate that the induced transparency distinctly appears when surface plasmon polaritons excited on the metal satisfy the wavevector matching condition with the guided mode in the high-refractive index (HRI) layer. The Q factor of the EIT-like spectrum can exceed 2000, which is remarkable compared to that of other plasmonic systems such as plasmonic metamaterials and waveguides. The position and lineshape of EIT-like spectrum are strongly dependent on the geometrical parameters. An EIT pair is generated in the splitting absorption spectra, which can be easily controlled by adjusting the incident angle of light. Especially, we achieve the dynamical tunability of EIT-like spectrum by changing the Fermi level of graphene inserted in the system. Our results will open a new avenue toward the plasmonic sensing, spectral shaping and switching.

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Section: Resultsmentioning

confidence: 69%

Flexibly tunable high-quality-factor induced transparency in plasmonic systems

Lü

Gan

Mao

et al. 2018

Sci Rep

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“…Most electromagnetically induced transparent resonances has broad frequency band and with low Q factor. For example, the [30] presented a dynamically tunable electromagnetically induced reflection (EIR) based on the complementary graphene metamaterials composed of the wire-slot and split-ring resonators slot (SRRs-slot) array structures for the terahertz region. But the value of Q factor is less than 8.…”

Section: Resultsmentioning

confidence: 99%

Dynamically tunable Fano resonance with high Q factor based on asymmetric Dirac semimetal split-ring structure

Yan

Song

Zhang

et al. 2020

Mater. Res. Express

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We propose an asymmetric split-ring (ASR) structure based on Dirac semimetal, which has Fano resonance with a high quality (Q) factor in the terahertz (THz) band, the Q factor can reach a maximum value of 20.19. Amplitude modulation can be achieved by increasing the degree of asymmetry Δθ of the asymmetric split ring. As a result, in this study, an amplitude modulation of 27.19% has been achieved by increasing the asymmetry from 10°to 40°. Furthermore, our full-wave electromagnetic simulations show that the frequency sensitivity values of Fano and quadrupole resonance are as high as 0.6 THz/refractive index unit (RIU) and 0.933 THz/RIU, respectively. In addition, the sensing range can be adjusted by changing the Fermi levels of Dirac semimetal. Our study can guide the practical application of ultrasensitive THz sensors. OPEN ACCESS RECEIVED

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“…These behaviors can be attributed to change in resonant frequency of graphene cutwire, in which the resonant frequency can be written as f f ffiffiffiffiffi E F p . 38,43 During the blue-shi, moreover, the amplitude of the transparency peak is almost unchanged, while the corresponding bandwidth gradually widens, as shown in Fig. 7(b).…”

Section: Tunabilitymentioning

confidence: 88%