Multispectral plasmon-induced transparency in hyperfine terahertz meta-molecules

Yang, Shengyan; Xia, Xiaoxiang; Liu, Zhe; Yiwen, E; Wang, Yujin; Tang, Chengchun; Li, Wuxia; Li, Junjie; Wang, Li; Gu, Changzhi

doi:10.1088/0953-8984/28/44/445002

Cited by 18 publications

(8 citation statements)

References 53 publications

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“…Meanwhile, the experimental modulation depth of the f 1 and f 3 extracted from the measured spectrum are 28.1% and 55.5%, respectively. It is worth noting that the values of both Q factor and modulation depth of the resonance f 1 and f 3 are much higher than that of the conventional metamaterials (The Q factor of both the fundamental inductive-capacitive and dipolar resonances in conventional metamaterials are usually smaller than ten) [13][14][15][16][17][18][19][20][21][22][23]. In order to better understand the fundamental nature and physical mechanism of these spectral resonances in greater detail, the surface current and electric field distributions at the three resonant frequencies (f 1 , f 2 , and f 3 ) were calculated as shown in Fig.…”

Section: Metamaterials Design and Experimentsmentioning

confidence: 99%

“…Hence, realizing resonators with high quality (Q) factors is of cardinal importance since various applications require metamaterials that support high-Qfactor resonances accompanying with strong field concentrations in subwavelength volume, such as optical switching [5,6], filtering [7,8], chemical/biological sensing [9][10][11], and slow light processing [12][13][14][15]. However, the Q factor of the majority of metal-based metamaterials is severely limited by high ohmic and radiative losses (Q<10) [13][14][15][16][17][18][19][20][21][22][23][24][25], which are considered a major hindrance to the development of typical plasmonic devices. Therefore, demonstration of metamaterials with ultrahigh Q-factor resonances has proven to be a challenging and crucial task for realistic applications.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous excitation of extremely high-Q-factor trapped and octupolar modes in terahertz metamaterials

Yang¹,

Tang²,

Liu³

et al. 2017

Opt. Express

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Achieving high-Q-factor resonances allows dramatic enhancement of performance of many plasmonic devices. However, the excitation of high-Q-factor resonance, especially multiple high-Q-factor resonances, has been a big challenge in traditional metamaterials due to the ohmic and radiation losses. Here, we experimentally demonstrate simultaneous excitation of double extremely sharp resonances in a terahertz metamaterial composed of mirror-symmetric-broken double split ring resonators (MBDSRRs). In a regular mirror-arranged SRR array, only the low-Q-factor dipole resonance can be excited with the external electric field perpendicular to the SRR gap. Breaking the mirror-symmetry of the metamaterial leads to the occurrence of two distinct otherwise inaccessible ultrahigh-Q-factor modes, which consists of one trapped mode in addition to an octupolar mode. By tuning the asymmetry parameter, the Q factor of the trapped mode can be linearly modulated, while the Q factor of the octupolar mode can be tailored exponentially. For specific degree of asymmetry, our simulations revealed a significantly high Q factor (Q>100) for the octupolar mode, which is more than one order of magnitude larger than that of conventional metamaterials. The mirror-symmetry-broken metamaterial offers the advantage of enabling access to two distinct high-Q-factor resonances which could be exploited for ultrasensitive sensors, multiband filters, and slow light devices.

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Section: Metamaterials Design and Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simultaneous excitation of extremely high-Q-factor trapped and octupolar modes in terahertz metamaterials

Yang¹,

Tang²,

Liu³

et al. 2017

Opt. Express

Self Cite

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“…More importantly, if VO2 islands are embedded into all four SRRs, the two peaks can be controlled both simultaneously and independently, as long as technically realizing separate stimulation of VO2 islands on each side of CWR. What's more, EIT with more peaks can be realized by introducing more different coupled dark modes [47], and each peak can also be independently controlled using the strategy described above. Obviously, such structure can provide double switchable THz channels, and can play an important role in THz active devices.…”

Section: Resultsmentioning

confidence: 99%

Actively tunable terahertz electromagnetically induced transparency analogue based on vanadium-oxide-assisted metamaterials

Zhang¹,

Yang²,

Han³

et al. 2020

Appl. Phys. A

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Recently, phase-change materials (PCMs) have drawn more attention due to the dynamically tunable optical properties. Here, we investigate the active control of electromagnetically induced transparency (EIT) analogue based on terahertz (THz) metamaterials integrated with vanadium oxide (VO2). Utilizing the insulator-to-metal transition of VO2, the amplitude of EIT peak can be actively modulated with a significant modulation depth. Meanwhile the group delay within the transparent window can also be dynamically tuned, achieving the active control of slow light effect. Furthermore, we also introduce independently tunable transparent peaks as well as group delay based on a double-peak EIT with good tuning performance. Finally, based on broadband EIT, the active tuning of quality factor of the EIT peak is also realized. This work introduces active EIT control with more degree of freedom by employing VO2, and can find potential applications in future wireless and ultrafast THz communication systems as multi-channel filters, switches, spacers, logic gates and modulators. Keywords: terahertz metamaterials; phase-change materials; vanadium oxide; electromagnetically induced transparency 1. Introduction Over the past decades, Metamaterials (MMs) have been focused continually due to the capability to manipulate electromagnetic (EM) waves in an unnatural way [1]. By designing artificial meta-resonators of MMs and arranging them appropriately, MMs can tailor lightwaves in subwavelength scale, consequently providing optical responses with desirable properties. In recent years, MMs have come to the terahertz (THz) regime [2]. Located between infrared and microwave band, THz radiations have enjoyed a rise of interest and are promising for security scanning [3], future wireless communications as well as the sixth-generation (6G) networks [3-5]. Now, MMshave been regarded as ideal platforms to achieve chipscale THz devices, such as THz sources [6,7], modulators [8,9], sensors [10,11] and absorbers [12,13].Recently, electromagnetically induced transparency (EIT) analogue in THz MMs have attracted more attention [14][15][16]. EIT refers to a sharp transparent window within a broad absorption spectrum, which comes from the quantum interference between two distinct excitation pathways in the natural three-level atom system [17]. Due to the dispersion properties, EIT has potential applications in slow light, optical data storage, nonlinear process enhancement and signal processing [18]. Mimicking EIT in the classical system, MMs can reproduce such effect via the near-field coupling between bright and dark modes supported on meta-resonators [14]. Compared with the conventional EIT, which requires severe experimental conditions [18], MM-based EIT analogue is easier to be produced and more stable, therefore suitable for practical chipscale applications [15].At the same time, for THz communication systems, THz devices with active tunability are required [19]. Therefore, various active optical materials have been utilized to turn passive MMs...

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“…This plasma phenomenon significantly changes the optical responses of the system and causes the appearance of a transparent window in the transmission spectrum. In recent years, PIT has been widely applied in the fields of optical filtering [2], sensing [3], slow light, and light conversion [4][5][6]. However, in practical applications, an active modulation of the transparent windows is necessary to control the optical responses dynamically and potentially expand the range of applications [7].…”

Section: Introductionmentioning

confidence: 99%

Dynamically Tunable Plasmon-Induced Transparency in Parallel Black Phosphorus Nanoribbons

Huang

Hong

et al. 2022

Plasmonics

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In this paper, we investigate the dynamically tunable plasmon-induced transparency (PIT) effects in parallel black phosphorus nanoribbons (BPNRs). The results show that the BPNRs having different lengths can be regarded as bright modes. Single-band, double-band, triple-band, and multi-band PIT effects based on the bright-bright mode coupling between parallel BPNRs are achieved. The physical mechanism of the single-band model can be explained theoretically by the radiating two-oscillator (RTO) model. Due to the heavier effective mass in the zigzag (ZZ) direction of the BP, the frequencies of the transparent peaks are shifted to lower frequencies when the placement directions of BPNRs are changed from the X-direction to the Y-direction.Furthermore, the resonant frequencies of the transparent windows in each model can be tuned by changing the relaxation rates of the BPNRs. The frequencies of the transparent windows are blue-shifted as the relaxation rates are increased. Finally, The corresponding sensors based on single-band PIT effect show high sensitivities of 7.35 THz/RIU. Our study has potential applications for improving the design of multiple-band filters, sensors and on-off switcher .

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Multispectral plasmon-induced transparency in hyperfine terahertz meta-molecules

Cited by 18 publications

References 53 publications

Simultaneous excitation of extremely high-Q-factor trapped and octupolar modes in terahertz metamaterials

Simultaneous excitation of extremely high-Q-factor trapped and octupolar modes in terahertz metamaterials

Actively tunable terahertz electromagnetically induced transparency analogue based on vanadium-oxide-assisted metamaterials

Dynamically Tunable Plasmon-Induced Transparency in Parallel Black Phosphorus Nanoribbons

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