Coupling-Assisted Quasi-Bound States in the Continuum in Heterogeneous Metasurfaces

Huang, Wei; Liu, Songyi; Zeng, Dehui; Yang, Quanlong; Zhang, Wentao; Yin, Shimin; Han, Jiaguang

doi:10.1109/jstqe.2023.3241657

Cited by 13 publications

(4 citation statements)

References 49 publications

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“…Metasurfaces, with artificial electromagnetic response not attainable in natural materials, offer a compact and versatile means of manipulating various characteristics of incident terahertz waves, including phase and amplitude [8][9][10]. Among them, the use of metasurfaces to actively control the resonant response of the electromagnetically induced transparency (EIT) effect has drawn continuous interests [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Active control of polarization-dependent terahertz surface plasmonic wave excitation using coupled graphene-metal hybrid metasurfaces

Su,

Li,

et al. 2024

Phys. Scr.

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Active control of terahertz surface plasmonic wave (SPW) intensity in the propagation direction holds substantial significance for advanced terahertz functional devices. In this study, we propose a graphene-metal hybrid split-ring slit resonator (SRSR) array metasurfaces and employ the concept of electromagnetically induced transparency (EIT) to achieve excitation of asymmetric SPWs under various polarization states. By individually integrating two graphene ribbons into the two split-ring slit gaps and applying different bias voltages, we observed a gradual transition in the excitation behavior of asymmetric terahertz SPWs, ultimately resembling that of a single SRSR. Near-field simulations reveal that this phenomenon is attributed to the short-connection effect of graphene. Our proposed graphene-metal active hybrid metasurface introduces a novel approach to realize active SPWs devices, holding potential applications in terahertz on-chip communication.

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Section: Introductionmentioning

confidence: 99%

Active control of polarization-dependent terahertz surface plasmonic wave excitation using coupled graphene-metal hybrid metasurfaces

Su,

Li,

et al. 2024

Phys. Scr.

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“…Recently, bound states in the continuum (BICs), nonradiative states with infinite confinement lifetimes, have emerged as efficient candidates to tailor nonlocal effects (38). By breaking symmetry in parameter and momentum spaces or destructive mode coupling to generate the leaky quasi-BIC (q-BIC), a finite high quality factor (Q-factor) can be achieved, providing potential for tailoring nearfield enhancement and far-field radiation (39)(40)(41)(42). However, because of considerations of meta-atom's individual and collective responses, as well as their interactions, nonlocal effects are generally difficult to manipulate, especially for flexible control up to the pixel level (43).…”

Section: Introductionmentioning

confidence: 99%

Nonlocal metasurface for dark-field edge emission

Yao,

Hsu,

Liang

et al. 2024

Sci. Adv.

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Nonlocal effects originating from interactions between neighboring meta-atoms introduce additional degrees of freedom for peculiar characteristics of metadevices, such as enhancement, selectivity, and spatial modulation. However, they are generally difficult to manipulate because of the collective responses of multiple meta-atoms. Here, we experimentally demonstrate the nonlocal metasurface to realize the spatial modulation of dark-field emission. Plasmonic asymmetric split rings (ASRs) are designed to simultaneously excite local dipole resonance and nonlocal quasi-bound states in the continuum and spatially extended modes. With one type of unit, nonlocal effects are tailored by varying array periods. ASRs at the metasurface’s edge lack sufficient interactions, resulting in stronger dark-field scattering and thus edge emission properties of the metasurface. Pixel-level spatial control is demonstrated by simply erasing some units, providing more flexibility than conventional local metasurfaces. This work paves the way for manipulating nonlocal effects and facilitates applications in optical trapping and sorting at the nanoscale.

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“…The other type is the parameter-tuned BIC or accidental BIC [26], which is achieved by destructive interference conditions, which are usually found in the metasurface supporting Fabry-Perot resonance [27], Friedrich-Wintgen coupling [28], Mie resonances [29], and single-mode resonance modes [30]. Temporal coupled-mode theory [31,32] and multipole scattering theory [33] are often used to explain the generation of the BIC and quasi-BIC phenomena. While breaking the mirror symmetry of BIC system, it is usually accompanied by the chiral phenomenon, which is called chiral quasi-BIC [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Chiral photothermoelectric effect driven by high-Q quasi-bound states in the continuum

Hu,

Yang,

Sang

et al. 2024

J. Opt.

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Bound states in continuum (BIC) have been proposed as a means to efficiently improve the light-matter interaction of metasurface. While breaking the mirror symmetry of structure and developing BIC into a reachable and observable quasi-BIC, it is usually accompanied by the chiral phenomenon with high quality (Q) factor. Here, we report a spin-sensitive photodetector in infrared (NIR) region, which is composed of a silicon metasurface with chiral quasi-BIC, a silver layer, and a thermoelectric layer. A chiral quasi- BIC supported by a silicon metsurface can be realized under normal incidence. Based on Finite element method (FEM) simulation, a silicon metsurface with a silver layer shows a high Q-factor of 958.6 with a giant absorption circular dichroism (CD) of 0.83. Subsequently, we study the thermal performance of the chiral absorbers by using Heat Transfer module of Comsol. Combining with the thermoelectric material bismuth telluride, we calculate the differential photothermoelectric effects of the system under circular-polarized light (CPL) irradiation. When the incident flux is 100 W/cm2, the output voltage under RCP (LCP) light reaches 0.59 mV (0.08 mV), which can be used for polarization detecting. Therefore, our designed structure incorporating thermoelectricity broadens the applications of chiral BIC in sensors and detectors.

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Coupling-Assisted Quasi-Bound States in the Continuum in Heterogeneous Metasurfaces

Cited by 13 publications

References 49 publications

Active control of polarization-dependent terahertz surface plasmonic wave excitation using coupled graphene-metal hybrid metasurfaces

Active control of polarization-dependent terahertz surface plasmonic wave excitation using coupled graphene-metal hybrid metasurfaces

Nonlocal metasurface for dark-field edge emission

Chiral photothermoelectric effect driven by high-Q quasi-bound states in the continuum

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