Defect-Controlled Hypersound Propagation in Hybrid Superlattices

Schneider, Dietrich; Liaqat, Faroha; Boudouti, El Houssaine El; Abouti, O. El; Tremel, Wolfgang; Butt, Hans‐Jürgen; Djafari‐Rouhani, Bahram; Fytas, George

doi:10.1103/physrevlett.111.164301

Cited by 43 publications

(42 citation statements)

References 36 publications

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“…Above a certain compression the acoustic band rises above the defect mode frequency and the dynamics transition to being extended. An analogous tuning and transition has been achieved by geometrically altering defect cavity layers in phononic superlattices [17]. The rightmost panel [ Fig.…”

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confidence: 75%

“…This is due to an additional degree of freedom provided by the displacement of the secondary mass [13]. Control over the localization is interesting to applications of defect modes [14][15][16][17], since many properties, for example, the wave speed in coupled resonant optical waveguides [16,18] and the coupling of phonon-photon interactions [14], depend on the spatial overlap of modes.…”

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confidence: 99%

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Local to Extended Transitions of Resonant Defect Modes

2014

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We study the localized modes created by introducing a resonant defect in a mechanical lattice. We find that modes introduced by resonant defects have profiles that can be tuned from being extremely localized to totally delocalized by an external force. This is in direct contrast with modes introduced by traditional mass or stiffness defects, in which the modes' profiles stay constant. We present an analytical model for resonant defects in one-dimensional nonlinear lattices, computationally demonstrate the equivalent effect in a twodimensional lattice, and experimentally observe the mode profiles in a granular crystal. While our study is concerned with nonlinear mechanical lattices, the generality of our model suggests that the same effect should be present in other types of periodic lattices.

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confidence: 75%

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confidence: 99%

Local to Extended Transitions of Resonant Defect Modes

2014

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“…3(a)) represented by a sum of Lorentzian lines and their peak position defines the phonon frequencies at a given wavenumber q. 5,7,12,14 In the present hPnC, phonons were probed with wave vector q ¼ k s -k i (Fig. 2(d)) lying along the CX and CM (Fig.…”

Section: A)mentioning

confidence: 98%

“…The uniqueness of the velocity values can be verified by a more stringent criterion, which is the prediction of the BLS intensity. 12,37 Since the samples are transparent, we use a simple expression of the Brillouin intensity based only on the elasto-optic (or photoelastic) mechanism of light-matter interaction, 38…”

Section: A)mentioning

confidence: 99%

“…1,4 Since the first realization of a hypersonic phononic band gap, 5 the design, fabrication, and characterization of 1D, 2D, and 3D hypersonic phononic crystals (hPnC) have been the subject of intensive research. [6][7][8][9][10][11][12][13][14] However, the fabrication of such periodic crystals is still a technological challenge, since the control over the periodicity for various 3D architectures on the sub micrometer scale is necessary. Electron and focused ion-beam lithographic techniques are powerful in producing 2D GHz phononic structures in opaque media.…”

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Band structure of cavity-type hypersonic phononic crystals fabricated by femtosecond laser-induced two-photon polymerization

Rakhymzhanov

Gueddida

Alonso-Redondo

et al. 2016

Applied Physics Letters

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The phononic band diagram of a periodic square structure fabricated by femtosecond laser pulse-induced two photon polymerization is recorded by Brillouin light scattering (BLS) at hypersonic (GHz) frequencies and computed by finite element method. The theoretical calculations along the two main symmetry directions quantitatively capture the band diagrams of the air- and liquid-filled structure and moreover represent the BLS intensities. The theory helps identify the observed modes, reveals the origin of the observed bandgaps at the Brillouin zone boundaries, and unravels direction dependent effective medium behavior.

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Phonon‐polariton entrapment in homogenous surface phonon cavities

et al. 2016

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Surface phonon cavities that are homogenous in both mechanical and dielectric properties are reported. The cavities are formed by the placement of a defect of a single domain within periodic domain inversion of single crystal piezoelectric lithium niobate that exhibits surface phononic bandgap through the phonon-polariton coupling. Surface cavity resonances are observed within the bandgap, which manifest in entrapment of phonon-polariton within the defect. In addition to demonstrating that the observed resonances are non-radiative and decoupled to bulk radiation, which is critical for high Q cavities, it is also shown the possibility to tune the surface cavity resonance spectra simply by varying the defect width. Such an ability to excite surface cavity resonance that is non-radiative with simultaneous localization of the electric field together with the advantage of a cavity that is physically formed from a completely monolithic and uniform material offers unique opportunities for widespread applications for example in actuation, detection, and phonon lasing that can be fully integrated with other physical systems such as quantum acoustics, photonics, and microfluidics.Phononic bandgap structures and phononic crystals are novel class of materials, which have emerged as promising candidates to control the suppression and redirection of phonon propagation in controlled manner in contrast to their behavior in unstructured bulk materials, given rise by their unique properties, namely phononic bandgaps [1-3] and negative refraction [4]. The ability for such control is crucial for current research in phonon-mediated photonic interactions [5][6][7][8][9], quantum physics [10-13], biosensing [14,15], and nano-scale thermal management [16,17]. A critical requirement in many of these applications is the ability to insulate a region of interest from random phonons in the environment. Reports have shown that if a defect is embedded within a phononic bandgap structure, a phonon cavity can be formed [18][19][20][21][22], enabling the trapping and concentration of phonons of a specific resonant frequency in a desired location, which has been observed via a picosecond ultrasonic technique [21], by Brillouin light scattering [19] or Raman spectra [18]. Dynamic tuning of these phonon cavity resonances can be directly achieved by controlling defect parameters, thus facilitating a number of applications, such as acoustic diodes [23], coherent phonon generation [20][21][22], thermal control [16,17], and concurrent phonon-photon modulation [24,25].The vast majority of the research [18][19][20][21][22], nevertheless, have been carried out to obtain phononic cavities for bulk waves; these structures typically comprising periodic composite media, often exclusively engineered from multi-layer single crystal semiconductor materials, achieved by molecular beam epitaxy. On the other hand, cavities for surface acoustic waves (SAWs) are highly desirable due to the enhanced concentration of acoustic energy at the surface that can facilitate di...

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Defect-Controlled Hypersound Propagation in Hybrid Superlattices

Cited by 43 publications

References 36 publications

Local to Extended Transitions of Resonant Defect Modes

Local to Extended Transitions of Resonant Defect Modes

Band structure of cavity-type hypersonic phononic crystals fabricated by femtosecond laser-induced two-photon polymerization

Phonon‐polariton entrapment in homogenous surface phonon cavities

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