Spatiotemporal path discontinuities of wavepackets propagating across a meta-atom
- Title
- Spatiotemporal path discontinuities of wavepackets propagating across a meta-atom
- Author
- 신동수
- Keywords
- ELECTROMAGNETICALLY INDUCED TRANSPARENCY; TERAHERTZ METAMATERIALS; PLASMONIC METASURFACES; LIGHT-PROPAGATION; WAVE-FRONT; REFRACTION; ANALOG; REFLECTION; LENSES; PHASE
- Issue Date
- 2014-04
- Publisher
- NATURE PUBLISHING GROUP, MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
- Citation
- Scientific reports v.4 ,pp. 4634
- Abstract
- The realization of phase discontinuities across metasurfaces has led to a new class of reflection and refraction. Here we present theory and experiment on the discontinuous propagation of wavepackets across subwavelength- thickness meta-atoms. Using acoustic waves, we observe the process of wavepackets traversing a meta-atom with abrupt displacements, which appear as path discontinuities on a space-time diagram. We construct a tunable meta-atom from two coupled resonators at,500 Hz, map the spatiotemporal trajectories of individual sonic pulses, and reveal discontinuities at the meta-atom where the pulses exit at a time similar to 50 ms ahead or behind their arrivals. Applications include thin acoustic metasurface lenses.
- URI
- http://dx.doi.org/10.1038/srep04634http://hdl.handle.net/20.500.11754/50080
- ISSN
- 0068-1261; 2045-2322
- DOI
- 10.1038/srep04634
- Appears in Collections:
- GRADUATE SCHOOL[S](대학원) > ETC
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