Analogue of electromagnetically induced transparency in a metal-dielectric bilayer terahertz metamaterial

Yue, Yang; He, Fengyan; Shu, Fangjie; Jing, Xufeng; Hong, Zhi

doi:10.1364/oe.428758

Cited by 13 publications

(3 citation statements)

References 61 publications

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“…Due to the very thin dielectric layer of the structure, an additional layer of substrate is required for a real device, which may have a certain impact on the simulation results. When the proposed structure was extended to the terahertz band, the coupling distance could be larger than 500 µm [49], no additional substrate was needed and the device could be easily fabricated by photolithography and deep etching [38]. stantial increase in the bandwidth of the EIT.…”

Section: Widely Tunable Eit Based On Td-bicmentioning

confidence: 99%

Analogue of Electromagnetically Induced Transparency in an All-Dielectric Double-Layer Metasurface Based on Bound States in the Continuum

Pan

et al. 2021

Nanomaterials

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Bound states in the continuum (BICs) have attracted much attention due to their infinite Q factor. However, the realization of the analogue of electromagnetically induced transparency (EIT) by near-field coupling with a dark BIC in metasurfaces remains challenging. Here, we propose and numerically demonstrate the realization of a high-quality factor EIT by the coupling of a bright electric dipole resonance and a dark toroidal dipole BIC in an all-dielectric double-layer metasurface. Thanks to the designed unique one-dimensional (D)–two-dimensional (2D) combination of the double-layer metasurface, the sensitivity of the EIT to the relative displacement between the two layer-structures is greatly reduced. Moreover, several designs for widely tunable EIT are proposed and discussed. We believe the proposed double-layer metasurface opens a new avenue for implementing BIC-based EIT with potential applications in filtering, sensing and other photonic devices.

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Section: Widely Tunable Eit Based On Td-bicmentioning

confidence: 99%

Analogue of Electromagnetically Induced Transparency in an All-Dielectric Double-Layer Metasurface Based on Bound States in the Continuum

Pan

et al. 2021

Nanomaterials

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“…Such an unparalleled control of electromagnetic fields can be achieved by simply tuning the geometry of the unit cells or meta-atoms that constructs the periodic array of the meta-device [7,8], The emergence and evolution of metamaterials have gained momentum after the seminal works on realizing negative index media came into picture about two decades ago [9,10]. Since then, these artificial photonic structures have seen a wide range of applications in realizing Electromagnetically induced transparency (EIT) [11,12], near-unity absorbers [13,14], sensors [15][16][17][18], switches [19][20][21][22], as well as extensive implementations in the studies pertaining to nonlinear-optics [23,24], quantum computation [25], observation of exceptional points [26], extraordinary transmissions [27,28] and many more. In this regard, we would like to mention that EIT-like effects are analogous to quantum-interference effects that lead to the observation of high transmission window in an otherwise absorptive background.…”

Section: Introductionmentioning

confidence: 99%

Accessing dual toroidal modes in terahertz plasmonic metasurfaces through polarization-sensitive resonance hybridization

et al. 2023

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Plasmonic metasurfaces have been quite a fascinating framework to invoke transformation of incident electromagnetic waves in recent times. Oftentimes, the building block of these metasurfaces (unit cells) consists of two or more meta-resonators. As a consequence, near-field coupling amongst these constituents may occur depending upon the spatial and spectral separation of the individual elements (meta-resonators). In such coupled structures resonance mode-hybridization can help in explaining the formation and energy re-distribution among the resonance modes. However, the coupling of these plasmonic modes is extremely sensitive to incident probe beam polarization and offers ample scope to harness newer physics. A qualitative understanding of the same can be attained through mode-hybridization phenomena. In this context, here, we have proposed a multi-element metastructure unit cell consisting of split ring and dipole resonators aiming to explore the intricate effects of the polarization dependency of these hybridized modes. Therefore, multi-resonator systems with varied inter-resonator spacings (sp= 3.0, 5.0 and 7.0 μm) are fabricated and characterized in the terahertz domain, showing a decrement in the frequency detuning (δ) by 30% (approx.) for a particular polarization orientation of THz probe beam. However, no such detuning is observed for the other polarization. Further, as an outcome of the strong near-field coupling, the emergence of dual toroidal modes is observed. Excitation of toroidal modes demands thoughtful mode engineering to amplify the response of these otherwise feeble modes. Such modes are capable of strongly confining electromagnetic fields due to higher Quality (Q-) factor. Our experimental studies have shown significant signature of the presence of these modes in the Terahertz (THz) domain, backed up with rigorous numerical investigations along with multipole analysis. The calculated multipole decomposition demonstrates stronger scattering amplitude enhancements (~ 7 times) at both the toroidal modes compared to off-resonant values. Such dual toroidal resonances are capable of superior field confinements as compared to single toroidal mode, and therefore, can potentially serve as an ideal testbed in developing next-generation multi-mode bio-sensors as well as realization of high Q-factor lasing cavities, electromagnetically induced transparency (EIT), non-radiating anapole modes, novel ultrafast switching, and several other applications.

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“…Terahertz metamaterials are artificially constructed structures composed of periodic arrays of subwavelength units [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. These metamaterials have been widely studied for their versatile and remarkable effects, such as circular dichroism, photoluminescence signal controllability, electromagnetically induced transparency, and near-perfect absorption [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. Among them, metamaterials-based electromagnetically induced transparency (EIT) windows and resonant bands have been extensively investigated for their potential applications in biosensing and biomolecular detection due to their ability to provide multi-channel detection [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Application of Multi-Resonant Bands Terahertz Metamaterials in the Field of Carbohydrate Films Sensing

Zhang

Guo

et al. 2023

Biosensors

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Terahertz spectroscopy is a powerful tool for investigating the properties and states of biological matter. Here, a systematic investigation of the interaction of THz wave with “bright mode” resonators and “dark mode” resonators has been conducted, and a simple general principle of obtaining multiple resonant bands has been developed. By manipulating the number and positions of bright mode and dark mode resonant elements in metamaterials, we realized multi-resonant bands terahertz metamaterial structures with three electromagnetic-induced transparency in four-frequency bands. Different carbohydrates in the state of dried films were selected for detection, and the results showed that the multi-resonant bands metamaterial have high response sensitivity at the resonance frequency similar to the characteristic frequency of the biomolecule. Furthermore, by increasing the biomolecule mass in a specific frequency band, the frequency shift in glucose was found to be larger than that of maltose. The frequency shift in glucose in the fourth frequency band is larger than that of the second band, whereas maltose exhibits an opposing trend, thus enabling recognition of maltose and glucose. Our findings provide new insights into the design of functional multi-resonant bands metamaterials, as well as new strategies for developing multi-band metamaterial biosensing devices.

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Analogue of electromagnetically induced transparency in a metal-dielectric bilayer terahertz metamaterial

Cited by 13 publications

References 61 publications

Analogue of Electromagnetically Induced Transparency in an All-Dielectric Double-Layer Metasurface Based on Bound States in the Continuum

Analogue of Electromagnetically Induced Transparency in an All-Dielectric Double-Layer Metasurface Based on Bound States in the Continuum

Accessing dual toroidal modes in terahertz plasmonic metasurfaces through polarization-sensitive resonance hybridization

Exploring the Application of Multi-Resonant Bands Terahertz Metamaterials in the Field of Carbohydrate Films Sensing

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