Achieving large acoustic and phonon band gaps in multilayered structures

2015 ◽  
Vol 213 (3) ◽  
pp. 824-830
Author(s):  
K. R. Mangipudi ◽  
Ch. Jooss ◽  
C. A. Volkert
Keyword(s):  
Band Gaps ◽  
Multilayered Structures ◽  
Phonon Band

Phonon Band Gaps

1997 ◽  
Vol 7 (3) ◽  
pp. 509-519 ◽  
Author(s):  
R. M. Hornreich ◽  
M. Kugler ◽  
S. Shtrikman ◽  
C. Sommers
Keyword(s):  
Band Gaps ◽  
Phonon Band

Phonon band gaps in the IV-VI monochalcogenides

2019 ◽  
Vol 100 (5) ◽  
Author(s):  
Uri Argaman ◽  
Ran E. Abutbul ◽  
Yuval Golan ◽  
Guy Makov
Keyword(s):  
Band Gaps ◽  
Phonon Band

Anisotropic lattice expansion of three-dimensional colloidal crystals and its impact on hypersonic phonon band gaps

2014 ◽  
Vol 16 (19) ◽  
pp. 8921 ◽  
Author(s):  
Songtao Wu ◽  
Gaohua Zhu ◽  
Jin S. Zhang ◽  
Debasish Banerjee ◽  
Jay D. Bass ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Colloidal Crystals ◽  
Band Gaps ◽  
Lattice Expansion ◽  
Phonon Band ◽  
Anisotropic Lattice

A Comment on “Phonon Band Gaps” by R.M. Hornreich et al.

1997 ◽  
Vol 7 (7) ◽  
pp. 863-864 ◽  
Author(s):  
Emanuel Gluskin
Keyword(s):  
Band Gaps ◽  
Phonon Band

Dibenzochrysene Enables Tightly Controlled Docking and Stabilizes Photoexcited States in Dual-Pore Covalent Organic Frameworks

2019 ◽  
Author(s):  
Torben Sick ◽  
Niklas Keller ◽  
Nicolai Bach ◽  
Andreas Koszalkowski ◽  
Julian Rotter ◽  
...  
Keyword(s):  
Molecular Docking ◽  
Photophysical Properties ◽  
Visible Spectrum ◽  
Large Family ◽  
Building Blocks ◽  
Band Gaps ◽  
Docking Site ◽  
Covalent Organic Frameworks ◽  
Connected Node ◽  
Optoelectronic Applications

Covalent organic frameworks (COFs), consisting of covalently connected organic building units, combine attractive features such as crystallinity, open porosity and widely tunable physical properties. For optoelectronic applications, the incorporation of heteroatoms into a 2D COF has the potential to yield desired photophysical properties such as lower band gaps, but can also cause lateral offsets of adjacent layers. Here, we introduce dibenzo[g,p]chrysene (DBC) as a novel building block for the synthesis of highly crystalline and porous 2D dual-pore COFs showing interesting properties for optoelectronic applications. The newly synthesized terephthalaldehyde (TA), biphenyl (Biph), and thienothiophene (TT) DBC-COFs combine conjugation in the a,b-plane with a tight packing of adjacent layers guided through the molecular DBC node serving a specific docking site for successive layers. The resulting DBC-COFs exhibit a hexagonal dual-pore kagome geometry, which is comparable to COFs containing another molecular docking site, namely 4,4′,4″,4‴-(ethylene-1,1,2,2-tetrayl)-tetraaniline (ETTA). In this context, the respective interlayer distances decrease from about 4.60 Å in ETTA-COFs to about 3.6 Å in DBC-COFs, leading to well-defined hexagonally faceted single crystals sized about 50-100 nm. The TT DBC-COFs feature broad light absorption covering large parts of the visible spectrum, while Biph DBC-COF shows extraordinary excited state lifetimes exceeding 10 ns. In combination with the large number of recently developed linear conjugated building blocks, the new DBC tetra-connected node is expected to enable the synthesis of a large family of strongly p-stacked, highly ordered 2D COFs with promising optoelectronic properties.

Flexural Wave Band Gaps in Phononic Crystal Thick Plates with Defects

2019 ◽  
Author(s):  
Edson Jansen Pedrosa de Miranda Junior ◽  
Jose Maria Campos dos Santos
Keyword(s):  
Phononic Crystal ◽  
Band Gaps ◽  
Flexural Wave ◽  
Wave Band ◽  
Thick Plates

Simulating Photonic Band Gaps in Crystals

2007 ◽  
Author(s):  
Daniel H. Kodan ◽  
Peter W. Chung
Keyword(s):  
Band Gaps ◽  
Photonic Band Gaps ◽  
Photonic Band
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