Acoustic Tamm states of three-dimensional solid-fluid phononic crystals
Küçük Resim Yok
Tarih
2018
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Acoustical Soc Amer Amer Inst Physics
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this work, the existence and propagation of acoustic Tamm states at the interface of air and a face-centered cubic solid-fluid phononic crystal composed of spherical air voids interconnected by cylindrical air channels are demonstrated. Supercell band structure computations via the finite element method reveal surface bands for Tamm states on (100), (110), and (111) surfaces of the phononic crystal. The states decay sharply into the phononic crystal so that only a two-row slab is sufficient to guide them over the respective surfaces without leakage, as confirmed by finite element simulations. In addition, surface wave propagation along the [10] direction of the (100) surface is experimentally demonstrated. Ability to confine the Tamm states in all three dimensions is a key aspect in designing few-layer-thick acoustic circuits. Low material filling fraction of the phononic crystal could be leveraged to realize lightweight all-acoustic systems where either bulk or surface states can be incorporated. (C) 2018 Acoustical Society of America.
Açıklama
Anahtar Kelimeler
Surface-States, Photonic Crystal, Band-Gap, Modes, Waves, Sound, Interface, Boundary, Shockley, Media
Kaynak
Journal of The Acoustical Society of America
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
143
Sayı
2
