Acoustic waveguide demultiplexer based on Fano resonance: Experiment and simulation

Robertson, W. M.; Vazquez, Carina; Lopez, Jennifer; LaVerde, Alexander; Giuntini, R. J.

doi:10.1063/5.0087034

Cited by 4 publications

(2 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The PnC device considered here is a 1D periodic system consisting of alternating stubs grafted periodically along a waveguide (Figure 1). The tubes and waveguides are filled with the same fluid (air) and characterized by the same impedance Z = ρv a , where ρ = 1.2 kg/m 3 is the mass density of air, v = 342 m/s is the longitudinal speed of acoustic wave and a = 3.14 cm 2 is the cross section of the guide [53]. The PnCs are made by the same material (air) with different geometrical parameters: the first PnC (on the left-hand side) is made by stubs of length d 1 and a period of length d 1 with a tube of length d 1 2 at the surface, whereas the second PnC (on the right-hand side) is made by stubs of length d 2 and a period of length d 2 with a tube of length d 2 2 at the surface (Figure 1b).…”

Section: Interface States From Zak Phases and Symmetry Of Edge Modesmentioning

confidence: 99%

“…The analytical calculations developed here are performed by means of the Green's function approach [3,52]. It is worth noticing that the interface states predicted here can be observed experimentally in the low-frequency domain using slender tubes or Helmholtz resonators as in the experiments based on the impulse response technique [12,14,[53][54][55]. The outline of this paper is as follows: In Section 2, we discuss the possibility of the existence of acoustical Tamm states from the band structures and Zak phases of the bulk bands of periodic infinite PnCs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tunable Topological Acoustic Tamm States in Comblike Structures Based on Band Inversion around Flat Bands

et al. 2022

View full text Add to dashboard Cite

We investigate the existence of acoustic Tamm states at the interface between two one-dimensional (1D) comblike phononic crystals (PnCs) based on slender tubes and discuss their topological or trivial character. The PnCs consist of stubs grafted periodically along a waveguide and the two crystals differ by their geometrical parameters (period and length of the stubs). We use several approaches to discuss the existence of Tamm states and their topology when connecting two half-crystals. First, we derive a necessary and sufficient condition on the existence of interface states based on the analysis of the bulk band structure and the symmetry of the band edge states. This approach is equivalent to an analysis of the Zak phases of the bulk bands in the two crystals. Indeed, a topological interface state should necessarily exist in any common bandgap of the two PnCs for which the lower (upper) band edges have opposite symmetries. A novelty of our structure consists in the fact that the symmetry inversion results from a band closure (flat band) rather than from a gap closure, in contrast to previous works. Then, such interface states are revealed through different physical quantities, namely: (i) the local density of states (LDOS), which exhibits a high localization around the interface; (ii) sharp peaks in the transmission spectra in the common bandgap when two finite crystals are connected together; (iii) the phases of the reflection coefficients at the boundary of each PnC with a waveguide, which have a direct relationship with the Zak phases. In addition, we show that the interface states can transform to bound states in the continuum (BICs). These BICs are induced by the cavity separating both PnCs and they remain robust to any geometrical disorder induced by the stubs and segments around this cavity. Finally, we show the impossibility of interface states between two connected PnCs with different stub lengths and similar periods. The sensitivity of these states to interface perturbations can find many practical applications in PnC sensors.

show abstract

Section: Interface States From Zak Phases and Symmetry Of Edge Modesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tunable Topological Acoustic Tamm States in Comblike Structures Based on Band Inversion around Flat Bands

et al. 2022

View full text Add to dashboard Cite

show abstract

Tunable acoustic resonances: From weak to strong coupling regime

Günay,

Biçer,

Korozlu

et al. 2023

Applied Physics Letters

View full text Add to dashboard Cite

Tunable interaction strength between a side-coupled ring resonator and an acoustic waveguide structure is demonstrated. Fano resonances in the weak coupling regime are observed from the interference between a discrete state of the ring resonator and a continuum state of the waveguide. As the distance between the two structures is decreased, a transition from weak to strong coupling regime is obtained, where we observe splitting in the transmission spectrum and Rabi oscillations in the temporal behavior for smaller values. The findings of the finite-element method simulations are supported with the results obtained from a simple theoretical model in which one can explain the dynamics of the hybrid modes. The results can contribute to device applications in acoustic sensors, switches, and surface acoustic wave integrated circuits.

show abstract

Flat band induced topological photonic Tamm states in stubbed structures: Theory and experiment

et al. 2023

View full text Add to dashboard Cite

Acoustic waveguide demultiplexer based on Fano resonance: Experiment and simulation

Cited by 4 publications

References 15 publications

Tunable Topological Acoustic Tamm States in Comblike Structures Based on Band Inversion around Flat Bands

Tunable Topological Acoustic Tamm States in Comblike Structures Based on Band Inversion around Flat Bands

Tunable acoustic resonances: From weak to strong coupling regime

Flat band induced topological photonic Tamm states in stubbed structures: Theory and experiment

Contact Info

Product

Resources

About