Thermo-acoustic phase modulator for physical reservoir computing

This study proposes a nonlinear thermo-acoustic phase modulator for application in physical reservoir computing. We designed and fabricated the modulator, and then investigated the properties such as insertion loss and modulation effects. Finally, we constructed a physical reservoir system with the proposed modulator and demonstrated benchmark tasks. The modulator makes use of surface acoustic waves, which contributes to fast processing and low power consumption. The modulator has a waveguide which also acts as a microheater. The modulation principle is a wave-velocity reduction caused by heating the surface of the substrate with the microheater, which provides nonlinearity and short-term memory required for the reservoir system. We confirmed these characteristics in the measurements of the modulator, and we verified the effectiveness of the modulator by NARMA2 task

Conference

• Taiki Ijima, Claude Meffen, Amit Banerjee, Jun Hirotani, Toshiyuki Tsuchiya, Development of a Thermal SAW Phase Modulator for Physical Reservoir Computing, 2024 IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium, Taipei, TAIWAN, Sep. 22-26, 2024, 8033.
• Taiki Ijima, Claude Meffan, Amit Banerjee, Jun Hirotani and Toshiyuki Tsuchiya, Nonlinear thermo-acoustic phase modulator for physical reservoir computing, 37th International Microprocesses and Nanotechnology Conference (MNC 2024), Kyoto, Japan, Nov. 12-15, 2024, 15B-3-1
• 井嶋泰貴*，Meffan Claude，Amit Banerjee，廣谷潤，土屋智由，表面弾性波リザバーへの応用に向けた熱音響位相変調器の開発第15回「マイクロ・ナノ工学シンポジウム」，仙台，2024年11月25‐28日，26A3-PN-54

Paper

• Taiki Ijima, Claude Meffan, Masaki Shimofuri, Amit Banerjee, Jun Hirotani, Toshiyuki Tsuchiya
  Nonlinear thermo-acoustic phase modulator for physical reservoir computing
  Japanese Journal of Applied Physics, accepted.
  DOI: 10.35848/1347-4065/adb6ac