Engineering the Hypersonic Phononic Band Gap of Hybrid Bragg Stacks

Nano Letters ◽  
2012 ◽  
Vol 12 (6) ◽  
pp. 3101-3108 ◽  
Author(s):  
Dirk Schneider ◽  
Faroha Liaqat ◽  
El Houssaine El Boudouti ◽  
Youssef El Hassouani ◽  
Bahram Djafari-Rouhani ◽  
...  
Keyword(s):  
Band Gap ◽  
Phononic Band Gap ◽  
Bragg Stacks

scholarly journals Evidence for a large phononic band gap leading to slow hot carrier thermalisation

2014 ◽  
Vol 68 ◽  
pp. 012002 ◽  
Author(s):  
S Chung ◽  
S Shrestha ◽  
X Wen ◽  
Y Feng ◽  
N Gupta ◽  
...  
Keyword(s):  
Band Gap ◽  
Phononic Band Gap ◽  
Hot Carrier

Evaluation of gel time of TEOS using the idea of phononic band-gap for macro bi-mass system

2020 ◽  
Vol 595 ◽  
pp. 412371
Author(s):  
Chayan Kanchan Karmakar ◽  
Priyanka Betal ◽  
Sampad Mukherjee
Keyword(s):  
Band Gap ◽  
Gel Time ◽  
Mass System ◽  
Phononic Band Gap

Full Band-Gap Silicon Phononic Crystals for Surface Acoustic Waves

2006 ◽  
Author(s):  
Saeed Mohammadi ◽  
Abdelkrim Khelif ◽  
Ryan Westafer ◽  
Eric Massey ◽  
William D. Hunt ◽  
...  
Keyword(s):  
Band Gap ◽  
Acoustic Waves ◽  
Phononic Crystal ◽  
Surface Acoustic Waves ◽  
Hexagonal Lattice ◽  
Phononic Crystals ◽  
Bulk Wave ◽  
Filling Fraction ◽  
Phononic Band Gap ◽  
Wide Range

Periodic elastic structures, called phononic crystals, show interesting frequency domain characteristics that can greatly influence the performance of acoustic and ultrasonic devices for several applications. Phononic crystals are acoustic counterparts of the extensively-investigated photonic crystals that are made by varying material properties periodically. Here we demonstrate the existence of phononic band-gaps for surface acoustic waves (SAWs) in a half-space of two dimensional phononic crystals consisting of hexagonal (honeycomb) arrangement of air cylinders in a crystalline Silicon background with low filling fraction. A theoretical calculation of band structure for bulk wave using finite element method is also achieved and shows that there is no complete phononic band gap in the case of the low filling fraction. Fabrication of the holes in Silicon is done by optical lithography and deep Silicon dry etching. In the experimental characterization, we have used slanted finger interdigitated transducers deposited on a thin layer of Zinc oxide (sputtered on top of the phononic crystal structure to excite elastic surface waves in Silicon) to cover a wide range of frequencies. We believe this to be the first reported demonstration of phononic band-gap for SAWs in a hexagonal lattice phononic crystal at such a high frequency.

scholarly journals A one-dimensional optomechanical crystal with a complete phononic band gap

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
J. Gomis-Bresco ◽  
D. Navarro-Urrios ◽  
M. Oudich ◽  
S. El-Jallal ◽  
A. Griol ◽  
...  
Keyword(s):  
Band Gap ◽  
One Dimensional ◽  
Phononic Band Gap

Band Gap Engineering in N-Dimensional Phononic Crystals

2006 ◽  
Author(s):  
Manvir S. Kushwaha
Keyword(s):  
Photonic Crystals ◽  
Band Structure ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Phononic Crystals ◽  
Spectral Gaps ◽  
Phononic Band Gap ◽  
Acoustic Waveguides ◽  
Photonic Band Gap Materials ◽  
Acoustic Filters

Periodic binary elastic/acoustic composites can give rise to genuine band gaps in the band structure. The term genuine refers to the complete gaps, which persist independently of the polarization of the wave and of its direction of propagation. Within these complete gaps sound and vibrations are forbidden, the "acoustic crystals" stand still, and the total silence reigns. Thus a vibrator (or defect) introduced into a periodic elastic composite would be unable to generate sound or vibrations within the gap. The existence of complete gaps in the band structure is closely associated with the (classical) Anderson localization of sound and vibrations. The search for phononic band-gap materials is of comparable interest to the pursuit of photonic band-gap materials. Thus the phononic crystals are to acoustics as photonic crystals are to optics. In comparison to the photonic crystals, there are additional parameters (the mass densities and two velocities - longitudinal and transverse) involved in the phononic crystals, which make the physics richer and leaves us with more options in the quest of creating full stop bands in the system. As regards the applications, the phononic crystals are envisioned to find ways in the acoustic waveguides, improvements in designing the transducers, elastic/acoustic filters, noise control, ultrasonics, and medical imaging, to name a few. Since the interesting phenomena emerging from the phononic crystals are all consequences of the existence of the gap(s), a major part of the research efforts has focused on the search for phononic band-gap crystals. As such, we report and emphasize on the spectral gaps in the band structure for cleverly synthesized N-dimensional (N = 1, 2, 3) phononic crystals. PACS numbers:

Topological design of phononic band gap crystals with sixfold symmetric hexagonal lattice

2017 ◽  
Vol 139 ◽  
pp. 97-105 ◽  
Author(s):  
Zhaoxuan Zhang ◽  
Yang Fan Li ◽  
Fei Meng ◽  
Xiaodong Huang
Keyword(s):  
Band Gap ◽  
Hexagonal Lattice ◽  
Phononic Band Gap ◽  
Topological Design
Sign in / Sign up

Export Citation Format

Share Document