Effect of Damping on Magnetic Induced Resonances in Cross Waveguide Structures

Mouadili, A.; Boudouti, El Houssaine El; Akjouj, Abdellatif; Al-Wahsh, Housni; Djafari‐Rouhani, Bahram

doi:10.1007/s10948-020-05742-5

Cited by 7 publications

(4 citation statements)

References 51 publications

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“…This behavior has been discussed by some of our group in Ref. [43] for BICs in magnonic circuits. In addition, similar results of the quality factor can be obtained from the DOS (see the Supplemental Material SM4 [41]).…”

Section: Single Layermentioning

confidence: 62%

Experimental Evidence of the Existence of Bound States in the Continuum and Fano Resonances in Solid-Liquid Layered Media

Amrani¹,

Quotane²,

Ghouila-Houri

et al. 2021

Phys. Rev. Applied

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Bound states in continuum (BICs) are resonances with zero width (infinite lifetime) without any leakage into the surrounding media. Their fascinating properties and potential applications have attracted a great deal of interest. In this paper, we give an analytical, numerical, and experimental demonstration of BICs in simple acoustic structures based on either a single solid layer or a triple solid-liquid-solid layer inserted between two liquids. These modes are an intrinsic property of the inserted structure (solid layer or solidliquid-solid triple layer) with free surfaces and are independent of the surrounding media. Two kinds of BICs are discussed: (i) Fabry-Perot (FP) BICs exist as the consequence of the intersection of the local resonances induced by inserted structure intersect the transmission zeros induced by the solid layers. (ii) Symmetry-protected (SP) BICs occur when appear at normal incidence due to the decoupling of the transverse modes in the solid layer from the longitudinal modes that propagate in the solid and solidliquid multilayer media. When the incidence angle departs slightly from the BIC conditions, the latter transform into Fano resonances characterized by an asymmetric line shape in the transmission spectra. In addition, we show that the transmission zeros give rise to negative delay times and therefore acoustic superluminal effect. The theoretical results are obtained by means of the Green's function method, whereas the experimental measurements are carried out in ultrasonic domain using plexiglass plates in water. These results may have important applications to realize subsonic and acoustic superluminal phenomena as well as acoustic filters and sensors.

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Section: Single Layermentioning

confidence: 62%

Experimental Evidence of the Existence of Bound States in the Continuum and Fano Resonances in Solid-Liquid Layered Media

Amrani¹,

Quotane²,

Ghouila-Houri

et al. 2021

Phys. Rev. Applied

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“…The optical BIC is invisible with zero linewidth and an infinite Q -factor in its optical spectra [ 14 ]. When it collapses to the quasi-BIC (QBIC), it can be experimentally observed with a highly enhanced Q factor [ 14 , 15 , 16 , 17 ] and other interesting phenomena [ 1 , 2 ]. These unique features distinguish BICs from the traditional optical modes and significantly improve the performance of optical devices, especially for sensors, whose sensitivity is directly affected by the Q factor.…”

Section: Introductionmentioning

confidence: 99%

“…However, BICs are locked in the passband of the continua in an open system, and these continua can be regarded as noise, limited the free-spectral-range (FSR, namely, there exists only one resonance within a broad optical span) of the sensors, and the FSR directly limits the operation span. Nevertheless, limited by the finite periodic system [ 44 ], or fabrication errors [ 45 ], the radiative loss is difficult to suppress, and only QBICs with finite radiative lifetime can be actually observed, exhibiting Fano resonances in the scattering spectrum [ 14 , 15 , 16 , 17 , 46 ]. The Q -factors of most QBICs are affected by the dimension of the open systems [ 8 , 47 ]; the larger the period, the higher the Q -factor.…”

Section: Introductionmentioning

confidence: 99%

Two Individual Super-Bound State Modes within Band Gap with Ultra-High Q Factor for Potential Sensing Applications in the Terahertz Wave Band

Guo

et al. 2023

Sensors

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Bound states in the continuum (BICs) garnered significant research interest in the field of sensors due to their exceptionally high-quality factors. However, the wide-band continuum in BICs are noise to the bound states, and it is difficult to control and filter. Therefore, we constructed a top-bottom symmetric cavity containing three high permittivity rectangular columns. The cavity supports a symmetry-protected (SP) superbound state (SBS) mode and an accidental (AC) SBS mode within the bandgap. With a period size of 5 × 15, the bandgap effectively filters out the continuum, allowing only the bound states to exist. This configuration enabled us to achieve a high signal-to-noise ratio and a wide free-spectral-range. The AC SBS and the SP SBS can be converted into quasi-SBS by adjusting different parameters. Consequently, the cavity can function as a single-band sensor or a dual-band sensor. The achieved bulk sensitivity was 38 µm/RIU in terahertz wave band, and a record-high FOM reached 2.8 × 108 RIU−1. The effect of fabrication error on the performance for sensor application was also discussed, showing that the application was feasible. Moreover, for experimental realization, a 3D schematic was presented. These achievements pave the way for compact, high-sensitivity biosensing, multi-wavelength sensing, and other promising applications.

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“…BICs were first predicted by Neumann and Wigner in 1929 [1]. Since then, BICs were found in various fields of physics such as photonics [7,8], acoustics [9][10][11], magnonics [12], mesoscopics [13,14], and plasmonics [15][16][17]. Interest in BICs also results from their potential use in many applications such as lasers [18], filters [19,20], and sensors [21,22].…”

Section: Introductionmentioning

confidence: 99%

Formation and highly directional output of long-lived resonances in photonic comblike structures

Dobrzyński,

Al-Wahsh,

Akjouj

et al. 2023

Phys. Rev. B

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Bound states in the continuum (BICs) and long-lived resonances have become a unique way to produce the extreme localization of light waves. In this paper, we present a theoretical demonstration of BICs and long-lived resonances in photonic comblike structures with two semi-infinite leads, together with their existence conditions. The comb structure is composed of connected guides of length L. The BICs correspond to localized resonances of infinite lifetime inside the comb, without any leakage into the surrounding leads. When BICs exist within state continua, they induce long-lived resonances for specific values of some modified lengths of the guides constituting the comb structure. This enables to regulate these resonances by means of these lengths. The obtained results take due account of the state number conservation between the final system and the reference one constituted by the independent comb and semi-infinite leads. This conservation rule enables to find all the states of the final system and among them the bound in continuum ones. In addition, we present a comb structure with highly directional outputs through two different lines. In each output line two different long-lived resonances enable to transmit two different signals. This system enables to demultiplex two different signals through each of two output lines. The analytical results are obtained by means of the Green's function technique. The structures and the long-lived resonances presented in this paper may have potential applications due to their high sensitivities to weak perturbations, in particular in filtering, sensing, and communication technology improvements.

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Effect of Damping on Magnetic Induced Resonances in Cross Waveguide Structures

Cited by 7 publications

References 51 publications

Experimental Evidence of the Existence of Bound States in the Continuum and Fano Resonances in Solid-Liquid Layered Media

Experimental Evidence of the Existence of Bound States in the Continuum and Fano Resonances in Solid-Liquid Layered Media

Two Individual Super-Bound State Modes within Band Gap with Ultra-High Q Factor for Potential Sensing Applications in the Terahertz Wave Band

Formation and highly directional output of long-lived resonances in photonic comblike structures

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