scholarly journals Infrared to visible upconversion of Nd3+ions in KPb2Br5low phonon crystal

2006 ◽  
Vol 14 (9) ◽  
pp. 3993 ◽  
Author(s):  
Rolindes Balda ◽  
Joaquín Fernández ◽  
Ei Ei Nyein ◽  
Uwe Hömmerich
Keyword(s):  
Phonon Crystal

scholarly journals Research Progress of Locally Resonance Acoustic Metamaterials

2021 ◽  
Vol 248 ◽  
pp. 01041
Author(s):  
Du Zhehua
Keyword(s):  
Sound Wave ◽  
Negative Refraction ◽  
Low Frequency ◽  
Research Progress ◽  
Frequency Noise ◽  
Bragg Scattering ◽  
Acoustic Metamaterials ◽  
Low Frequency Noise ◽  
Phonon Crystal ◽  
Developed Surface

Bragg scattering phonon crystal and locally resonant acoustic metamaterials were introduced. In order to generate noise reduction, the lattice constant of Bragg scattering phonon crystal should be of the same order of magnitude as the wave length of the sound wave, therefore, its application field is limited. Locally resonant acoustic metamaterials consume sound energy by coupling its own resonant frequencies with those of sound waves at close range. Its size is two orders of magnitude smaller than the wavelength of sound wave; thus, the control of low-frequency noise by small-size acoustic metamaterials is realized. Locally resonant acoustic metamaterials have some extraordinary physical characteristic in the conventional medium for their special acoustic structural units, such as negative refraction and negative mass density. Especially in low frequency band, they have acoustic forbidden band in which the sound wave transmission is prohibited. Acoustic structural unit having resonant characteristics has been developed. Surface-mounted resonant element plate structures and thin film acoustic metamaterials are the normal types of locally resonant acoustic metamaterials. Their research and development provide a new method for low-frequency noise control.

Nd3+sensitized upconversion luminescence of Nd3+/Pr3+codoped KPb 2 Cl 5 low phonon crystal

2011 ◽  
Author(s):  
R. Balda ◽  
M. Al-Saleh ◽  
M. A. Arriandiaga ◽  
S. Garcia-Revilla ◽  
J. Fernández
Keyword(s):  
Upconversion Luminescence ◽  
Phonon Crystal

scholarly journals Exploring bandgap generation mechanism of phonon crystal

2020 ◽  
Vol 22 (1) ◽  
pp. 013008 ◽  
Author(s):  
Chiming Wang ◽  
Wangqiang Xiao ◽  
Dehui Wu ◽  
Changming Lin ◽  
Jingjing Xiao ◽  
...  
Keyword(s):  
Generation Mechanism ◽  
Phonon Crystal

Electrically reconstructable phonon crystal based on a coplanar waveguide with a nanodimensional ferroelectric film

2013 ◽  
Vol 39 (10) ◽  
pp. 921-923 ◽  
Author(s):  
V. M. Mukhortov ◽  
S. I. Masychev ◽  
A. A. Mamatov ◽  
Vas. M. Mukhortov
Keyword(s):  
Coplanar Waveguide ◽  
Ferroelectric Film ◽  
Phonon Crystal

Raman study of coupled-phonon–crystal-field excitations inNd1+xBa2−xCu3Oysingle crystals

1998 ◽  
Vol 58 (21) ◽  
pp. 14349-14355 ◽  
Author(s):  
A. A. Martin ◽  
T. Ruf ◽  
T. Strach ◽  
M. Cardona ◽  
T. Wolf
Keyword(s):  
Crystal Field ◽  
Phonon Crystal ◽  
Raman Study
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