Three-dimensional phononic nanocrystal composed of ordered quantum dots

Abstract

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Non-equilibrium phonon generation and detection in microstructure devices

“…Successfully adapting STJbased phonon generation and detection techniques to the microscale has required several methods not used in previous macroscopic efforts, in particular the use of microphotolithography to place STJs onto microstructure sidewalls, the use of double-junction detectors for Josephson-current suppression, and the accounting for the role of quasiparticle diffusion in determining the effective area of the generator and detector. Phonons of controllable energy are emitted by the phonon generators from an area smaller than the phonon emission area of pulsed laser methods 6,33 and comparable to that demonstrated using scanning electron-beams. 34 This spatial resolution may be readily improved by fabricating smaller STJs.…”

“…[1][2][3][4][5] Existing methods to study thermal transport in dielectric structures permit either (a) spectrally resolved measurements of phonon modes in bulk-size samples, 3,4,6 or (b) measurement of total heat transmission (thermal conductance) in nanoscale samples. [7][8][9][10][11] However, the latter type of measurement cannot distinguish among phonon modes and cannot tell whether the phonons scatter inelastically in transit.…”

Wave Propagation in Nanoscaled Periodic Layered Structures

“…[43][44][45][46][47][48] Recently, the manufacture, measurement and computation of the hypersonic PNC together with its applications in manipulation of hypersonic acoustic waves have received more and more considerable attention. [49][50][51][52] It is known that the size-effect 53 54 will become more important and should be taken into account when a system is in the dimension of several nanometers. Ramprasad et al 55 calculated the phononic band structures for a nanoscaled multilayer stack by using the firstprinciples method 56 at the atomistic level and by solving the classical elastic wave equation at the continuum level, respectively.…”

Mapping gigahertz vibrations in a plasmonic–phononic crystal

“…In particular, attention has been devoted to periodic acoustic nanostructures, i.e. phononic crystals, where phononic band gaps arise [8][9][10][11][12][13][14][15][16]; such research on regular arrays of nano-objects has led to enhanced control over systems with resonant frequencies in the gigahertz range, paving the way for the development of novel high-frequency acoustic devices such as acousto-optic modulators and sensors.…”