Induced transparency based subwavelength acoustic demultiplexers

Gu, Tianyu; Cheng, Yi; Wen, Zhihui; Boudouti, EI Houssaine Ei; Jin, Yabin; Li, Yong; Djafari‐Rouhani, Bahram

doi:10.1088/1361-6463/abe07c

Cited by 11 publications

(7 citation statements)

References 42 publications

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“…In fact, coupling multiple units to achieve a broad bandwidth is the most direct and effective way in the metamaterial design [41][42][43][44]. Recently, several broadband locally-resonant AMS have been proposed [38,42,45,46]. For example, Nguyen [37] proposed a subwavelength double-layer acoustic silencer based on the slit-type Helmholtz resonators, and the fluctuating TL produced by various resonances can be mitigated via the thermal viscosity inside the HR slit.…”

Section: Introductionmentioning

confidence: 99%

Compact broadband acoustic meta-silencer based on synergy between reactive and resistive units

Zhang¹,

Yu²,

Xiao³

et al. 2022

J. Phys. D: Appl. Phys.

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Acoustic silencers are the most effective solution to control noise in ducts. In this paper, we propose a compact acoustic meta-silencer (AMS) based on the synergy between reactive and resistive units that enables the reduction of low-frequency and broadband noise. We first propose a conceptual AMS comprising simple reactive and resistive units to verify its unique sound attenuation performance. To explore its potential for application, we then propose an advanced AMS unit consisting of two independent annular chambers that represent reactive and resistive units, respectively. The synergistic mechanism between reactive and resistive units to achieve superior sound attenuation is revealed. Next, the band structures of the infinite periodic advanced AMS are discussed, and three different types of advanced AMS containing six units are examined. It is demonstrated numerically and experimentally that the optimized AMS with a compact size can achieve a transmission loss (TL) higher than 15 dB over a super-wide low-frequency range (290 Hz–1344 Hz). The work here provides a new avenue for the design of low-frequency and broadband meta-silencers to control the noise in ducts.

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Section: Introductionmentioning

confidence: 99%

Compact broadband acoustic meta-silencer based on synergy between reactive and resistive units

Zhang¹,

Yu²,

Xiao³

et al. 2022

J. Phys. D: Appl. Phys.

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“…Other research involves Helmholtz resonators installed on the surface of the waveguide. [ 19 ] Two resonators were attached to each output channel so that they selectively output acoustic waves at certain frequencies. Fabricating these systems is much easier since the wavelength of acoustic waves can easily be longer than optical waves.…”

Section: Introductionmentioning

confidence: 99%

Selective Heating Through Y‐Junction Waveguide Designed by Acoustic Shape Optimization

et al. 2022

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Unlike phononic crystals or systems designed by topology optimization, waveguides designed by shape optimization do not have voids or internal defects, making the fabrication process more suitable for additive manufacturing. By designing a Y‐junction waveguide through shape optimization, an ultrasonic wave can be controlled so that it propagates to a predetermined location just by adjusting its frequency. These demultiplexed ultrasonic waves can be used to transport signals or stimulate nearby materials. As an example, the ultrasonic wave is converted to heat at different locations, which can be applied to mechanisms that can take advantage of heating. First, shape optimization is performed on a cylindrical structure to selectively propagate ultrasonic waves of a particular frequency while attenuating others, which is analyzed through a finite element model. The numerical study results are compared with experimental measurements from samples fabricated through additive manufacturing methods. After verifying the concept, the Y‐junction waveguide is fabricated to demultiplex the wave and selectively heat different locations. The results show that the method of combining shape optimization with additive manufacturing is exceptionally simple and capable of demultiplexing ultrasonic waves, which can replace complex electrical components with single‐material waveguides.

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“…The EIT resonance can also be realized in a so-called Cross structure with two grafted stubs at the same site. These Cross and U-shaped structures displaying Fano or EIT resonances have been proposed for the design of demultiplexers in mesoscopics [36], acoustics [37,38], photonics [39] and magnonics [40]. The aim of this paper is to extend these concepts to the field of plasmonics by using MIM-type waveguides for the transport of plasmonic modes and stubs as local resonators.…”

Section: Introductionmentioning

confidence: 99%

Analytical and numerical study of T-shaped plasmonic demultiplexer based on Fano and induced transparency resonances

Amrani¹,

Khattou²,

Rezzouk³

et al. 2021

J. Phys. D: Appl. Phys.

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We study analytically and numerically the design of plasmonic demultiplexers based on Fano and plasmonic induced transparency (PIT) resonances. The demultiplexers consist of T-shaped structures with an input waveguide and two output waveguides. Each output contains two waveguide stubs grafted either at the same position or at two different positions far from the input waveguide. We derive closed form analytical expressions of the geometrical parameters allowing a selective transfer of a single mode in one waveguide without affecting the other one. This is performed by implementing the Fano and PIT resonances which are characterized by a resonance placed near an antiresonance or placed between two antiresonances respectively. In particular, we show the possibility of trapped modes, also called bound in continuum (BIC) modes. These modes appear as resonances with zero width in the transmission spectra for appropriate lengths of the stubs. Then, by detuning slightly the stubs, BICs transform to PIT or Fano resonances. The existence of a full transmission besides a transmission zero, enables to filter a given wavelength on one output waveguide, by vanishing both the transmission on the second waveguide as well as the reflection in the input waveguide. The demultiplexer is capable to separate two fundamental optical windows (i.e. 1310 and 1550 nm). The performance of the demultiplexer platform is measured using the crosstalk of the two outputs and quality factor. The lowest value of the crosstalk −96.8 dB with an average of −84.7 dB is achieved and a maximum quality factor 45 is obtained. The maximum transmission reaches a high value of 85% despite the large metallic losses. These values are suitable for integrated photonic circuits in the optical communication. The analytical results are obtained by means of the Green’s function method which enables us to deduce the transmission and reflection coefficients, as well as the delay times and density of states. These results are confirmed by numerical simulations using a 2D finite element method. The analytical analysis developed in this work represent a predictive method to understand deeply different physical phenomena in more complex plasmonic devices.

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Induced transparency based subwavelength acoustic demultiplexers

Cited by 11 publications

References 42 publications

Compact broadband acoustic meta-silencer based on synergy between reactive and resistive units

Compact broadband acoustic meta-silencer based on synergy between reactive and resistive units

Selective Heating Through Y‐Junction Waveguide Designed by Acoustic Shape Optimization

Analytical and numerical study of T-shaped plasmonic demultiplexer based on Fano and induced transparency resonances

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