A mass-loaded topological switching mechanism for phononic biosensors
Abstract
Abstract We propose a switchable topological phononic biosensor that exploits interface modes protected by band topology. The device is based on a hexagonal unit cell consisting of six tungsten pillars embedded in an acrylic resin matrix, arranged with an equilateral-triangle-based motif that, when unrotated, enforces threefold symmetry. Two topologically distinct domains are formed by slightly rotating this internal triangular structure, creating robust zero-line modes localized at their interface. Finite-element simulations show that surface mass loading shifts the interface-mode dispersion and switches the propagation path at a fixed excitation frequency, providing a new biosensing mechanism based on topological mode switching.
Fields of Study & Subjects
Topological Materials and Phenomena
Acoustic Wave Phenomena Research
Metamaterials and Metasurfaces Applications
Publication details
- Journal / source
- Japanese Journal of Applied Physics
- Publisher
- IOP Publishing
- Volume
- 65
- Issue
- 3
- Pages
- 03SP30–03SP30
- Publication date
- 13 January 2026
- Language
- EN