Files in This Item:
| File | Format | ||
|---|---|---|---|
| b1200903.mp4 | Streaming Video | View/Open |
| 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 |