Observing metamaterial induced transparency in individual Fano resonators with broken symmetry

Singh, Ranjan; Al-Naib, Ibraheem; Yang, Yuping; Chowdhury, Dibakar Roy; Cao, Wei; Rockstuhl, Carsten; Ozaki, T.; Morandotti, Roberto; Zhang, Weili

doi:10.1063/1.3659494

Cited by 283 publications

(149 citation statements)

References 32 publications

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“…In this structure, two gaps are present, and these are placed at angles other than 180 ° . [16][17][18] Examples for sensors based on such asymmetric split-ring resonators include biosensors in the GHz and THz region, [ 19 , 20 ] as well as sensors in the mid-infrared. [ 21 , 22 ] The asymmetric plasmonic geometry provides also the potential for other nanophotonic applications, such as lasing spasers, [ 23 ] coherent plasmon emitters, [ 24 ] and tunable metamaterials with narrow linewidth and varying coupling strength.…”

Section: Doi: 101002/adma201202109mentioning

confidence: 99%

Large‐Area Low‐Cost Plasmonic Nanostructures in the NIR for Fano Resonant Sensing

et al. 2012

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Large‐area low‐cost plasmonic nanostructures with high‐quality Fano resonances have been fabricated for the first time. Hole‐mask colloidal nanolithography is utilized and the degree of asymmetry of double split‐ring resonators is varied to optimize the modulation depth of the Fano resonances for refractive index sensing. In situ optical spectroscopy during thermal annealing monitors the spectral change to control improvement of sample quality. Liquids with different refractive indices yield experimental sensitivities of up to 520 nm/RIU and figures of merit of 2.9.

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Section: Doi: 101002/adma201202109mentioning

confidence: 99%

Large‐Area Low‐Cost Plasmonic Nanostructures in the NIR for Fano Resonant Sensing

et al. 2012

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“…The comprehensive study on the coupling schemes in these structures is detailed in Figure S4 of the Supporting Information. [ 36 ] Besides the independent control of bright and dark mode resonators to actively tune the transparency in the system, both the individual resonators can be simultaneously actuated to completely change the system from the strongly coupled to uncoupled confi guration or vice versa. Figure 5 d shows the transmission response of the coupled system under the simultaneous reconfi guration of CWR and SRR to OFF state.…”

Section: Communicationmentioning

confidence: 99%

Active Control of Electromagnetically Induced Transparency Analog in Terahertz MEMS Metamaterial

Pitchappa

Manjappa

et al. 2016

Advanced Optical Materials

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541wileyonlinelibrary.com COMMUNICATIONand their possible applications. The ultimate form of active manipulation of EIT phenomenon will be when all three primary parameters are controlled independently. The independent control of individual resonators demands for the controllability at unit cell level, and conventional approaches such as optical pumping of photoconductive elements or thermally controlled superconductor are restricted to provide only global control.Recently, microelectromechanical systems (MEMS) based tunable metamaterials have been reported to achieve controllability at unit cell level, along with the added advantage of being electrically controlled, miniaturized size and enhanced electrooptic performance. The versatility of MEMS design has enabled active manipulation of numerous THz properties such as magnetic resonance, [19][20][21][22] electrical resonance, [23][24][25] anisotropy, [ 26 ] broadband response, [ 27 ] isotropic resonance switching [ 28 ] multiresonance switching, [29][30][31] and coupling strength between resonators. [ 32 ] The enhanced controllability and direct integration of MEMS actuators into metamaterial unit cell geometry is an ideal fi t for the realization of selective control of coupled mode resonators. In this Communication, reconfi gurable metamaterial with independently controlled bright and dark mode resonators is proposed for advanced manipulation of the classical analog of EIT and slow light effects in THz spectral region. The active control of bright mode resonator enables modulation of EIT intensity, while the tuning of dark mode resonance causes the EIT peak to tune in frequency. Furthermore, simultaneous switching of bright and dark mode resonators results in dynamic switching of the system between coupled and uncoupled states. The proposed approach of selective reconfi guration can be scaled for multiresonator systems, which can be coupled either through inductive, capacitive, or conductive means.The metamaterial consists of 80 × 80 periodic array of cut wire resonator (CWR) with closely placed split ring resonators (SRRs), as shown in Figure 1 and Figure 2 . The periodicity of unit cell is 100 µm along both axial directions. The CWR has length, l C = 60 µm and width, w C = 5 µm, respectively. The SRRs have a base length, b S = 30 µm, side length, l S = 20 µm, and split gap, g S = 4 µm. The SRRs are placed at a distance of S = 2 µm from the CWR. When the polarization of the excitation fi eld is along the CWR arm, the dipole mode resonance of the CWR will be the bright mode and the inductive-capacitive (LC) mode of SRR resonance acts as the dark mode. Thus for the incident THz polarization, the direct excitation of the bright mode induces image charges on the nearby SRRs through nearfi eld inductive coupling, thereby exciting the LC resonance of the SRRs. These bright-dark resonances have contrasting line widths with identical resonance frequencies and under a strong coupling regime they experience an EIT-type of interference that gives rise to a sharp transm...

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“…The emergence of metamaterials that has the ability to support resonances in subwavelength structures created the possibility to capture and control electromagnetic near fields in artificially designed structures [12−15,22,23,29−37] . In this section we review a near field mediated coupling between bright and dark mode metamaterial resonators [12][13][14][15]29,30] . The near field coupled metamaterial arrays are shown in Figs.…”

Section: Near-field Coupling Between Bright and Dark Plasmonic Modes mentioning

confidence: 99%

Metamaterial inspired terahertz devices: from ultra-sensitive sensing to near field manipulation

Wang

Singh

et al. 2013

中国光学快报

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We present a review of terahertz plasmonic metamaterial devices that have functionalities and applications ranging from sensing, enhanced electromagnetic fields, and near field manipulation. Metamaterials allow the properties of light propagation to be manipulated at will by using a combination of appropriately designed geometry and suitable materials at the unit cell level. In this review, we first discuss the sensing aspect of a planar plasmonic metamaterial and how to overcome its limitations. Conventional symmetric metamaterials are limited by their low Q factor, thus we probed the symmetry broken plasmonic metamaterial structures in which the interference between a broad continuum mode and a narrow localized mode leads to the excitation of the sharp Fano resonances. We also discuss the near field mediated excitation of dark plasmonic modes in metamaterials that is caused by a strong coupling from the bright mode resonator. The near field coupling between the dark and bright mode resonances leads to classical analogue of electromagnetically induced transparency in plasmonic systems. Finally, we discuss active switching in terahertz metamaterials based on high temperature superconductors that holds the promise of reducing the resistive losses in these systems, though it fails to suppress the radiation loss in plasmonic metamaterial at terahertz frequencies.

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Observing metamaterial induced transparency in individual Fano resonators with broken symmetry

Cited by 283 publications

References 32 publications

Large‐Area Low‐Cost Plasmonic Nanostructures in the NIR for Fano Resonant Sensing

Large‐Area Low‐Cost Plasmonic Nanostructures in the NIR for Fano Resonant Sensing

Active Control of Electromagnetically Induced Transparency Analog in Terahertz MEMS Metamaterial

Metamaterial inspired terahertz devices: from ultra-sensitive sensing to near field manipulation

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