[19p-D62-1~17] 22.1 Joint Session M "Phonon Engineering"

1:30 PM - 1:45 PM JST(4:30 AM - 4:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[19p-D62-3] Automated tailoring of the phonon dispersion for highly anisotropic phononic crystal

〇(P)Michele Diego¹, Matteo Pirro¹, Byunggi Kim¹, Roman Anufriev¹, Masahiro Nomura¹ (1.IIS, Univ. of Tokyo)

Keywords:

Phononic Metasurfaces,Genetic algorithm,Brillouin light scattering

Controlling acoustic/phononic properties at the nanoscale is crucial across numerous fields, spanning from thermal transport, mechanical resonators and nano-sensing to quantum technologies. In recent years, phononic crystals have emerged as a highly advantageous class of structures for tailoring phononic properties in advanced devices. However, the current design of phononic crystals often rely on conventional shapes and follow simple rules based on human intuition. In this work, we experimentally demonstrate an automated way to design phononic crystals, exploiting an inverse design method called genetic algorithm [1]. With this method, the desired phononic properties are input into the algorithm, which automatically identifies the optimal structural design to meet these specific requirements. This enables the discovery of shapes beyond traditional human-made structures, resulting in crystals with unique properties. In this case, we optimize a two-dimensional phononic crystal to exhibit high phononic anisotropy along different directions of the crystal. Subsequently, we fabricate the structure by means of clean room techniques and experimentally validate the predicted high anisotropy using Brillouin light scattering spectroscopy. [1] M. Diego, M.Pirro, B.Kim, R.Anufriev and M.Nomura, "Tailoring Phonon Dispersion of Genetically Designed Nanophononic Metasurface", ACS Nano (accepted).