Interface nano-confined acoustic waves in polymeric surface phononic crystals

Travagliati, Marco; Nardi, Damiano; Giannetti, Claudio; Gusev, Vitalyi; Pingue, Pasqualantonio; Piazza, Vincenzo; Ferrini, Gabriele; Banfi, Francesco

doi:10.1063/1.4905850

Cited by 28 publications

(19 citation statements)

References 30 publications

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“…An experimental demonstration of sensing functionalities in our system goes beyond the purpose of the present work. However, the present investigation can be of relevance for the development of all-optical cost-effective NW-based sensing platforms compatible with microfluidic integration [ 38 , 39 ], where the sensing area of the chip is made of NWs, light is focused at a fixed incidence angle and the reflectance versus wavelength is probed. For instance, when a small quantity of fluid is driven within a microfluidic circuit into the NW-based reflector (with a size scalable down to a few micrometers), the liquid fills the gaps around the NWs, and the reflectance spectrum changes.…”

Section: Discussion: Sensing Applicationsmentioning

confidence: 99%

Self-Assembled InAs Nanowires as Optical Reflectors

et al. 2017

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Subwavelength nanostructured surfaces are realized with self-assembled vertically-aligned InAs nanowires, and their functionalities as optical reflectors are investigated. In our system, polarization-resolved specular reflectance displays strong modulations as a function of incident photon energy and angle. An effective-medium model allows one to rationalize the experimental findings in the long wavelength regime, whereas numerical simulations fully reproduce the experimental outcomes in the entire frequency range. The impact of the refractive index of the medium surrounding the nanostructure assembly on the reflectance was estimated. In view of the present results, sensing schemes compatible with microfluidic technologies and routes to innovative nanowire-based optical elements are discussed.

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Section: Discussion: Sensing Applicationsmentioning

confidence: 99%

Self-Assembled InAs Nanowires as Optical Reflectors

et al. 2017

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“…The present work tackles temperature propagation in the frame of the firstorder DPL model, and its CV limit, adopting the same line of thought as the one that has been successfully followed in solid state physics, for instance when addressing coherent electronic transport [48], acoustic propagation in metamaterials [49,50,51] and electromagnetic wave propagation in matter. The complex-…”

Section: Introductionmentioning

confidence: 99%

Accessing temperature waves: A dispersion relation perspective

Gandolfi

Benetti

Glorieux

et al. 2019

International Journal of Heat and Mass Transfer

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c 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ In order to account for non-Fourier heat transport, occurring on short time and length scales, the often-praised Dual-Phase-Lag (DPL) model was conceived, introducing a causality relation between the onset of heat flux and the temper-arXiv:1908.07612v1 [cond-mat.mes-hall] 18 Aug 2019 ature gradient. The most prominent aspect of the first-order DPL model is the prediction of wave-like temperature propagation, the detection of which still remains elusive. Among the challenges to make further progress is the capability to disentangle the intertwining of the parameters affecting wave-like behaviour.This work contributes to the quest, providing a straightforward, easy-to-adopt, analytical mean to inspect the optimal conditions to observe temperature wave oscillations. The complex-valued dispersion relation for the temperature scalar field is investigated for the case of a localised temperature pulse in space, and for the case of a forced temperature oscillation in time. A modal quality factor is introduced showing that, for the case of the temperature gradient preceding the heat flux, the material acts as a bandpass filter for the temperature wave.The bandpass filter characteristics are accessed in terms of the relevant delay times entering the DPL model. The optimal region in parameters space is discussed in a variety of systems, covering nine and twelve decades in space and time-scale respectively. The here presented approach is of interest for the design of nanoscale thermal devices operating on ultra-fast and ultra-short time scales, a scenario here addressed for the case of quantum materials and graphite.

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“…A periodic metal pattern is formed on a substrate, and interacts with a surface acoustic wave (SAW), typically a Rayleigh wave. Taking SAW devices as the platform, surface phononic crystals are able to exercise interrogation on thin soft polymer in conjunction with opto-acoustic transducers [18,19] and increase transmitting pulse temporal beating [20]. Unfortunately this method cannot be used for bulk materials, so it cannot be used to modulate sound transmission in the larger environment.…”

Section: Introductionmentioning

confidence: 99%

One-step polymeric phononic crystal manufacture

Lowe

Stevenson

2019

Ultrasonics

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A versatile system to construct bulk polymeric phononic crystals by using acoustic waves is described. In order to fabricate this material, a customised cavity device fitted with a ∼2 MHz acoustic transducer and an acoustic reflector is employed for the acoustic standing wave creation in the device chamber. The polymer crystal is formed when the standing waves are created during the polymerisation process. The resulting crystals are reproduced into the shape of the tunable device cavity with a unique periodic feature. The separation is related to the applied acoustic wave frequency during the fabrication process and each unit cell composition was found to be made up to two material phases. To assess the acoustic properties of the polymer crystals their average acoustic velocity is measured relative to monomer solutions of different concentrations. It is demonstrated that one of the signature characteristics of phononic crystal, the slow wave effect, was expressed by this polymer. Furthermore the thickness of a unit cell is analysed from images obtained with microscope. By knowing the thickness the average acoustic velocity is calculated to be 1538 m/s when the monomer/cross-linker concentration is 1.5 M. This numerical calculation closely agrees with the predicted value for this monomer/cross-linker concentration of 1536 m/s. This work provides a methodology for rapid accessing a new type of adaptable phononic crystal based on flexible polymers.

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Interface nano-confined acoustic waves in polymeric surface phononic crystals

Cited by 28 publications

References 30 publications

Self-Assembled InAs Nanowires as Optical Reflectors

Self-Assembled InAs Nanowires as Optical Reflectors

Accessing temperature waves: A dispersion relation perspective

One-step polymeric phononic crystal manufacture

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