Active manipulation of electromagnetically induced reflection in complementary terahertz graphene metamaterial

He, Xiaodong; Yao, Yuan; Huang, Yufei; Zhang, Qinfei; Zhu, Lei; Wu, Fengmin; Ying, Guobing; Jiang, Jiuxing

doi:10.1016/j.optcom.2017.09.038

Cited by 19 publications

(7 citation statements)

References 37 publications

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“…www.nature.com/scientificreports/ reflection properties. Therefore, this theoretical work could help to design and understand the working principles of these active metamaterials 24,27,34 . Moreover, since the resonance frequency is very sensitive to the dielectric environment, the observation of its shift can be used for various chemical and biological sensing applications [35][36][37] .…”

Section: Resultsmentioning

confidence: 99%

Anomalous blueshift of aperture resonance enabled by the loss of a thin film

Kyoung

2020

Sci Rep

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The substrate effects on aperture resonance have been widely studied because the resonance peak position is key for sensing, communications, and field enhancement applications. So far, the theoretical works have focused on the lossless infinite substrate case, which only explains the resonance peak redshift by the substrate index. The loss effect has not been investigated yet because lossy infinite substrate significantly reduces the aperture transmission. Therefore, this work studied the loss effect on aperture resonance via an analytic model of the transmission though slot antennas on a finite substrate. When the substrate thickness was very thin compared to the wavelength, the transmittance remained high even for a large imaginary part of the refractive index; furthermore, the developed model predicted a strong blueshift when this imaginary part exceeds the real part. Besides, the zero of the imaginary part of the coupling strength was crucial in determining the resonance frequency for both infinite and finite substrates. Thus, this study can contribute to the material characterization, label-free detection, and efficient design of active metamaterials.

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Section: Resultsmentioning

confidence: 99%

Anomalous blueshift of aperture resonance enabled by the loss of a thin film

Kyoung

2020

Sci Rep

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“…4(a) exhibit a common horizontal branch at κ ¼ 1 as predicted from Eqs. ( 15), ( 18) and (23). In presence of the magnetic flux (Fig.…”

Section: Dbc Nbc and Bic Statesmentioning

confidence: 99%

“…In addition to the EIT resonances, the electromagnetically induced reflection (EIR) refers to the formation of a reflection window inside a transparency band of an atomic system. Recently, this effect has been studied theoretically [22,23] and experimentally [24] in metamaterials made of wire-slot and split-ring resonator arrays. Other works have treated theoretically [25] and experimentally [26] EIR resonances in planar metamaterials for plasmonic sensing applications.…”

Section: Introductionmentioning

confidence: 99%

Aharonov-Bohm-effect induced transparency and reflection in mesoscopic rings side coupled to a quantum wire

Mrabti

Labdouti

Mouadili

et al. 2020

Physica E: Low-dimensional Systems and Nanostructures

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We demonstrate analytically and numerically the possibility of existence of the analogues of electromagnetic induced transparency (EIT) and electromagnetic induced reflection (EIR) in a simple mesoscopic structure. The latter consists of a ring of length 2d attached vertically to two semi-infinite leads (waveguide) by a wire of length d 1 . The ring is threaded by a magnetic flux Φ, the so-called Aharonov-Bohm effect. The number of dangling wire-ring resonators attached at the same point can be increased to N. First, we demonstrate analytically that in the absence of the magnetic flux (Φ ¼ 0) and for particular values of d 1 , the structure may present some states that are confined in the ring and do not interact with the waveguide states. These trapped states fall in the continuum states of the two leads and therefore represent bound in continuum (BIC) states. These states are characterized by a zero width resonance (i.e., infinite life-time) in the transmission and reflection spectra. In presence of a weak magnetic flux (Φ 6 ¼ 0), the BIC states transform to EIT or EIR resonances for specific values of the lengths d 1 and d of the wire and the ring respectively. In addition to the numerical results, we have developed Taylor expansion calculations of the transmission and reflection coefficients around EIT and EIR resonances to show that the latter can be written following a Fano shape. In particular, we have deduced the Fano parameter q and the quality factor Q of these resonances as function of N and the flux Φ. We have found that Q decreases as function of Φ for both EIT and EIR resonances, whereas it increases (decreases) as function of N for EIT (EIR) resonances. These results show the possibility of tuning EIT and EIR resonances by means of the magnetic flux Φ and the number of dangling resonators N. The effect of temperature on EIT and EIR resonances is also considered through an analysis of the Landauer-Buttiker conductance formula obtained from transmission. The theoretical results are obtained within the framework of the Green's function method which enables us to deduce analytically the dispersion relation, transmission and reflection coefficients. These results may have important applications for electronic transport in mesoscopic systems such as filters and demultiplexers.

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“…Contrary to PIT, it generates a reflection window in the transparency band of the system. Lately, PIR-phenomenon has been investigated theoretically [35,36] and experimentally [37] in metamaterials made of wire-slot and split-ring resonator arrays. Furthermore, authors in Ref.…”

Section: Introductionmentioning

confidence: 99%

Terahertz multi-plasmon induced reflection and transmission and sensor devices in a graphene-based coupled nanoribbons resonators

Noual

Amrani

Boudouti

et al. 2019

Optics Communications

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We demonstrate numerically multi-plasmon-induced reflection (PIR), multi-plasmon-induced transparency (PIT) and propose a highly sensitive refractive index nanosensor in a novel ultra-compact graphene-based nano-device, operating in the terahertz frequency range. The base structure of the system is composed out of a bus waveguide made out of graphene coupled to resonators inserted along or aside the waveguide where each resonator is constituted by a set of two coupled graphene nano-ribbons (CGNR). The latters behave as a molecule-like entity, whose surface plasmon eigen-modes originate from the splitting of the single ribbons modes. We show that the two CGNRs can also be regarded as an effective rectangular cavity-like system, so that the insertion of the latter along or aside the graphene bus waveguide (GBW) enables the design of tunable selective or rejective filters, respectively. By inserting two identical effective cavities in the structure, into a Λlike state (in analogy with three level atomic systems), we show the possibility of realizing multiple plasmon induced reflection, and highlight its fast light-features. On the other hand, if the two identical cavities are set symmetrically on each side of the GBW with slightly detuned Fermi energy levels in a V-like configuration, multi-plasmon induced transparency can be obtained. In addition, a highly sensitive refractive index nanosensor is showcased. The latter consists in a GBW, sidecoupled to an effective cavity-oscillator embedded with the analyte to be detected. The sensitivity of the sensor is numerically derived. Owing to its simple structure, the proposed sensor may offer the advantage of being easily fabricated. The showcased graphene-based devices proposed in this work should help the design of tunable and highly integrated optical devices such as nano-filters, optical switches and highly sensitive nanosensors.

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Active manipulation of electromagnetically induced reflection in complementary terahertz graphene metamaterial

Cited by 19 publications

References 37 publications

Anomalous blueshift of aperture resonance enabled by the loss of a thin film

Anomalous blueshift of aperture resonance enabled by the loss of a thin film

Aharonov-Bohm-effect induced transparency and reflection in mesoscopic rings side coupled to a quantum wire

Terahertz multi-plasmon induced reflection and transmission and sensor devices in a graphene-based coupled nanoribbons resonators

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