Abstract
We report on the experimental observation of the existence and the interaction of localized defect modes in a full acoustic band gap in a two-dimensional lattice of steel cylinders immersed in water. The confinement of defect modes and the splitting of their resonance frequencies are observed and are explained by their evanescent coupling. A new type of waveguiding in a phononic crystal based on the evanescent coupling of defect modes is proposed and demonstrated experimentally. The finite-difference time-domain (FDTD) method is used to interpret the experimental data and it is found that theoretical predictions properly account for the observed spectra.
| Original language | English |
|---|---|
| Pages (from-to) | 377-380 |
| Number of pages | 4 |
| Journal | Proceedings - IEEE Ultrasonics Symposium |
| Volume | 1 |
| Publication status | Published - 2003 |
| Externally published | Yes |
| Event | 2003 IEEE Ultrasonics Symposium - Proceedings - Honolulu, HI, United States Duration: 5 Oct 2003 → 8 Oct 2003 |