Mechanical mode engineering with orthotropic metamaterial membranes
arXiv:2202.13705 · doi:10.1002/admt.202200337
Abstract
Metamaterials are structures engineered at a small scale with respect to the wavelength of the excitations they interact with. These structures behave as artificial materials whose properties can be chosen by design, mocking and even outperforming natural materials and making them the quintessential tool for manipulation of wave systems. In this Letter we show how the acoustic properties of a silicon nitride membrane can be affected by nanopatterning. The degree of asymmetry in the pattern geometry induces an artificial anisotropic elasticity, resulting in the splitting of otherwise degenerate mechanical modes. The artificial material we introduce has a maximum Ledbetter-Migliori anisotropy of 1.568, favorably comparing to most bulk natural crystals. With an additional freedom in defining arbitrary asymmetry axes by pattern rotation, our approach can be useful for fundamental investigation of material properties as well as for devising improved sensors of light, mass or acceleration based on micromechanical resonators.
References in corpus (22)
- Cavity Optomechanics
- Strong dispersive coupling of a high finesse cavity to a micromechanical membrane
- Broadband Acoustic Cloak for Ultrasound Waves
- Reverse Doppler Effect of Sound
- Gradient metasurfaces: a review of fundamentals and applications
- Ultra-coherent nanomechanical resonators via soft clamping and dissipation dilution
- High quality mechanical and optical properties of commercial silicon nitride membranes
- Optomechanical coupling in a two-dimensional photonic crystal defect cavity
- Nanoelectromechanical Sensors based on Suspended 2D Materials
- Dynamic modulation of photonic crystal nanocavities using gigahertz acoustic phonons
- High quality-factor mechanical resonators based on WSe2 monolayers
- High-finesse Fabry-Perot cavities with bidimensional SiN photonic-crystal slabs
- Spiderweb nanomechanical resonators via Bayesian optimization: inspired by nature and guided by machine learning
- Quantum Electromechanics on Silicon Nitride Nanomembranes
- Micromechanical bolometers for sub-Terahertz detection at room temperature
- Centimeter-scale suspended photonic crystal mirrors
- Mechanically Compliant Grating Reflectors for Optomechanics
- Optomechanics of chiral dielectric metasurfaces
- Vibrational modes of ultrathin carbon nanomembrane mechanical resonators
- Membrane sandwich squeeze film pressure sensors
- High frequency mechanical excitation of a silicon nanostring with piezoelectric aluminum nitride layers
- Optomechanical response with nanometer resolution in the self-mixing signal of a terahertz quantum cascade laser