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Exceptional energy harvesting from coupled bound states.
Felix Kronowetter1,2,3, Anton Melnikov4, Marcus Maeder5
1Chair of Vibro-Acoustics of Vehicles and Machines, Department of Engineering Physics and Computation, TUM School of Engineering and Design, Technical University of Munich, Bavaria, Germany. felix.kronowetter@tum.de.
Nature Communications
|April 13, 2025
Summary
Researchers developed novel acoustic energy harvesters using bound states in the continuum. These devices efficiently convert ubiquitous low-density noise into usable electrical power, significantly outperforming traditional methods for low-power applications.
Area of Science:
- Acoustics and Energy Harvesting
- Materials Science and Engineering
Background:
- Noise pollution presents a ubiquitous, low-density energy source.
- Conventional energy harvesters struggle with the low energy density of ambient noise.
- Bound states in the continuum offer a mechanism for localized energy concentration.
Purpose of the Study:
- To investigate bound state acoustic harvesters for efficient energy conversion.
- To theoretically, numerically, and experimentally validate the performance of these novel harvesters.
- To explore methods for further enhancing energy harvesting efficiency.
Main Methods:
- Theoretical modeling of bound state acoustic phenomena.
- Numerical simulations to predict harvester performance.
- Experimental fabrication and testing of bound state acoustic harvesters.
- Comparison with conventional Helmholtz resonator harvesters.
Main Results:
- Bound state harvesters demonstrated superior performance over Helmholtz resonators.
- A factor of 2.2 increase in output voltage amplitude spectral density was observed.
- A 10-fold increase in output power was achieved compared to conventional harvesters.
- A 'super-bound state' configuration yielded a 50-fold increase in output voltage.
Conclusions:
- Bound state acoustic harvesters represent a significant advancement in energy harvesting technology.
- These devices offer a promising solution for powering low-power devices using ambient noise.
- The 'super-bound state' concept further enhances energy harvesting potential.
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