Non-Foster acoustic radiation from an active piezoelectric transducer
Abstract
Many of the exciting wave phenomena found in acoustic metamaterials arise as a result of the collective response of subwavelength resonators. To widen the frequency range of these phenomena, it is necessary to understand the source of these bandwidth limitations and explore techniques that can overcome them. Here, we quantify the general tradeoff between size and bandwidth of passive acoustic resonators and show how this constraint can be overcome by actively loading them. As an example, we demonstrate a large bandwidth enhancement of a sonar transducer by connecting it to a specialized active non-Foster circuit. This important finding can have long-lasting impact in acoustic metamaterials for exotic sound interactions, paving the way to enhanced compact resonant acoustic devices.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 19, 2021
- Source ID
- 10.1073/pnas.2024984118
Entities
People
- Andrea Alù
- Curtis Rasmussen
Organizations
- Air Force Office of Scientific Research
- CUNY Graduate School and University Center
- City University of New York
- National Science Foundation
- Simons Foundation
- University of Texas at Austin