Point source in a phononic grating: stop bands give rise to phonon-focusing caustics
We use locally-excited gigahertz surface phonon wavepackets in microscopic line structures of different pitches to reveal profound anisotropy in the radiation pattern of a point source in a grating. Time-domain data obtained by an ultrafast optical imaging technique and by numerical simulations are...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing,
2013-03-28T17:37:33Z.
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| Subjects: | |
| Online Access: | Get fulltext |