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Genetic algorithm enables precise design of phononic crystals

A genetic algorithm for phononic crystals
Researchers at the Institute of Industrial Science, The University of Tokyo implement a genetic algorithm to automatically design phononic crystals with desired vibrational properties, which may help with future computer and communication devices. Credit: Institute of Industrial Science, The University of Tokyo

The advent of quantum computers promises to revolutionize computing by solving complex problems exponentially more rapidly than classical computers. However, today's quantum computers face challenges such as maintaining stability and transporting quantum information.

Phonons, which are quantized vibrations in periodic lattices, offer new ways to improve these systems by enhancing qubit interactions and providing more reliable information conversion. Phonons also facilitate better communication within quantum computers, allowing the interconnection of them in a network.

Nanophononic materials, which are artificial nanostructures with specific phononic properties, will be essential for next-generation quantum networking and . However, designing phononic crystals with desired characteristics at the nano- and micro-scales remains challenging.

In a study recently published in the journal ACS Nano, researchers from the Institute of Industrial Science of The University of Tokyo have experimentally proven a new genetic algorithm for the automatic inverse design—which outputs a structure based on desired properties—of phononic crystal nanostructures that allows the control of acoustic waves in the material.

"Recent advances in and inverse design offer the possibility to search for irregular structures that show unique properties," explains lead author of the study Michele Diego.

Genetic algorithms use simulations to iteratively assess proposed solutions, with the best passing on their characteristics, or "genes," to the next generation. Sample devices designed and fabricated with this new method were tested with light scattering experiments to establish the effectiveness of this approach.

The team was able to measure the vibrations on a two-dimensional phononic "metacrystal," which had a periodic arrangement of smaller designed units. They showed that the device allowed vibrations along one axis, but not along a perpendicular direction, and it can thus be used for acoustic focusing or waveguides.

"By expanding the search for optimized structures with complex shapes beyond normal human intuition, it becomes possible to design devices with precise control of acoustic wave propagation properties quickly and automatically," says senior author Masahiro Nomura. This approach is expected to be applied to surface acoustic wave devices used in quantum computers, smartphones and other devices.

More information: Tailoring Phonon Dispersion of Genetically Designed Nanophononic Metasurface, ACS Nano (2024). DOI: 10.1021/acsnano.4c01954

Journal information: ACS Nano

Citation: Genetic algorithm enables precise design of phononic crystals (2024, July 3) retrieved 13 July 2024 from
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