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Title: Transformation Acoustics : Virtual Pinholes and Collimators
Originating Office: IAS
Speaker: Fang, Nicholas
Issue Date: 5-Oct-2012
Event Date: 5-Oct-2012
Group/Series/Folder: Record Group 8.15 - Institute for Advanced Study
Series 3 - Audio-visual Materials
Location: 8.15:3 EF
Notes: Croucher Advanced Study Institute on New Materials and New Concepts for Controlling Light and Waves. Talk no.17
Host: HKUST Institute for Advanced Study.
Sponsor: The Croucher Foundation.
Abstract: The remarkable success of electromagnetic metamaterials stimulated exploration of controlling and manipulation of other form of waves in materials.
The talk will present our preliminary study of a virtual hole and a broadband acoustic collimator, by combination of the concept of complimentary media with transformational acoustics. Such effect is exemplified by a segmental defect in the original cloak, which appears as if a dipole scatterer was under the acoustic imager. We also derived a set of spatially varying effective parameter from coordinate transformation. These parameters can be readily implemented using non-resonant acoustic elements. Our numerical study confirmed the collimation of acoustic beam from a small hydrophone behind the metamaterial device. The potential application of such novel device concept in underwater communication and medical ultrasound will be also discussed.
Duration: 37 min.
Appears in Series:8.15:3 - Audio-visual Materials
Videos for Public -- Distinguished Lectures