Thermal transport in 2- and 3-dimensional periodic “holey” nanostructures

Ma, Jan; Sadhu, Jyothi; Ganta, D.; Tian, Hongxiang; Sinha, Sanjiv

doi:10.1063/1.4904073

Cited by 21 publications

(19 citation statements)

References 60 publications

(106 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The periodic and aperiodic nanomeshes are subject to very similar particle boundary scattering. However, coherence effects would be disrupted by the aperiodicity, as recently shown for acoustic wave propagation in the nanomesh36 and phonon transport in superlattices37. Possible effects of phonon confinement in the direction would also be the same between these periodic and aperiodic structures.…”

Section: Resultsmentioning

confidence: 84%

Investigation of phonon coherence and backscattering using silicon nanomeshes

et al. 2017

View full text Add to dashboard Cite

Phonons can display both wave-like and particle-like behaviour during thermal transport. While thermal transport in silicon nanomeshes has been previously interpreted by phonon wave effects due to interference with periodic structures, as well as phonon particle effects including backscattering, the dominant mechanism responsible for thermal conductivity reductions below classical predictions still remains unclear. Here we isolate the wave-related coherence effects by comparing periodic and aperiodic nanomeshes, and quantify the backscattering effect by comparing variable-pitch nanomeshes. We measure identical (within 6% uncertainty) thermal conductivities for periodic and aperiodic nanomeshes of the same average pitch, and reduced thermal conductivities for nanomeshes with smaller pitches. Ray tracing simulations support the measurement results. We conclude phonon coherence is unimportant for thermal transport in silicon nanomeshes with periodicities of 100 nm and higher and temperatures above 14 K, and phonon backscattering, as manifested in the classical size effect, is responsible for the thermal conductivity reduction.

show abstract

Section: Resultsmentioning

confidence: 84%

Investigation of phonon coherence and backscattering using silicon nanomeshes

et al. 2017

View full text Add to dashboard Cite

show abstract

“…In addition, the phase of the atomic displacements defining phonons needs to be maintained in a suitable spatial extension. This leads introducing the frequency‐dependent phonon coherence length, which represents the average spatial extension of a phonon wave packet at the given frequency . When phonon coherence length exceeds a required number of PnC periods, phonon wave interference modifies the energy dispersion relations of the phonon band structure.…”

Section: Thermal Transportmentioning

confidence: 99%

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

Sledzinska

Graczykowski

Maire

et al. 2019

Adv Funct Materials

View full text Add to dashboard Cite

The central concept in phononics is the tuning of the phonon dispersion relation, or phonon engineering, which provides a means of controlling related properties such as group velocity or phonon interactions and, therefore, phonon propagation, in a wide range of frequencies depending on the geometries and sizes of the materials. Phononics exploits the present state of the art in nanofabrication to tailor dispersion relations in the range of GHz for the control of elastic waves/phonons propagation with applications toward new information technology concepts with phonons as state variable. Moreover, phonons provide an adaptable approach for supporting a coherent coupling between different state variables, and the development of nanoscale optomechanical systems during the last decade attests this prospect. The most extended approach to manipulate the phonon dispersion relation is introducing an artificial periodic modulation of the elastic properties, which is referred to as phononic crystal (PnC). Herein, the focus is on the recent experimental achievements in the fabrication and application of 2D PnCs enabling the modification of the dispersion relation of surface and membrane modes, and presenting phononic bandgaps, waveguiding, and confinement in the hypersonic regime. Furthermore, these artificial materials offer the potential of modifying and controlling the heat flow to enable new schemes in thermal management.

show abstract

“…However, there is considerable debate on the role played by phonon coherence when periodicities are large compared with λ but small compared with Λ U . Since incoherent scattering may reproduce the ultra-low thermal conductivity of NMs due to surface disorder and partially coherent transport may also result in the same without consideration of disorder, the effect of coherence at room temperature may be difficult to resolve without additional data and characterization [177]. Very recently, Lee et al isolated the waverelated coherence effects by comparing periodic and aperiodic silicon NMs and quantified the backscattering effect by comparing variable-pitch NMs [67].…”

Section: Coherent Phonon Transport In Nmsmentioning

confidence: 99%

Phonon coherence and its effect on thermal conductivity of nanostructures

Xie

Ding

Zhang

2018

Advances in Physics: X

View full text Add to dashboard Cite

The concept of coherence is one of the fundamental phenomena in electronics and optics. In addition to electron and photon, phonon is another important energy and information carrier in nature. Without any doubt, exploration of the phonon coherence and its impact on thermal conduction will markedly change many aspects in broad applications for heat control and management in the real world. So far, the application of coherent effect on manipulation of phonon transport is a challenging work. In this article, we review recent advances in the study of the phonon coherent transport in nanomaterials and nanostructures. We first briefly look back the classical and quantum theory of coherence. Next, we review the progresses made in the understanding of phonon coherence in superlattice, nanowires and nanomeshes, respectively, and focus on the effect of phonon coherence on thermal conductivity. Finally, we introduce the recent advances in the direct detection of phonon coherence using optical coherence theory. ARTICLE HISTORY

show abstract

Thermal transport in 2- and 3-dimensional periodic “holey” nanostructures

Cited by 21 publications

References 60 publications

Investigation of phonon coherence and backscattering using silicon nanomeshes

Investigation of phonon coherence and backscattering using silicon nanomeshes

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

Phonon coherence and its effect on thermal conductivity of nanostructures

Contact Info

Product

Resources

About