Orbital Angular Momentum Multiplexing in Space-Time Thermoacoustic Metasurfaces Articles uri icon

authors

  • JIA, YUROU
  • LIU, YIMIN
  • HU, BOLUN
  • XIONG, WEI
  • BAI, YECHAO
  • CHENG, YING
  • WU, DAJIAN
  • LIU, XIAOJUN
  • CHRISTENSEN, JOHAN

publication date

  • July 2022

start page

  • 1

end page

  • 10

issue

  • 29, 2202026

volume

  • 34

International Standard Serial Number (ISSN)

  • 0935-9648

Electronic International Standard Serial Number (EISSN)

  • 1521-4095

abstract

  • Multiplexing technology with increased information capacity plays a crucial role in the realm of acoustic communication. Different quantities of sound waves, including time, frequency, amplitude, phase, and orbital angular momentum (OAM), have been independently introduced as the physical multiplexing approach to allow for enhanced communication densities. An acoustic metasurface is decorated with carbon nanotube patches, which when electrically pumped and set to rotate, functions as a hybrid mode-frequency-division multiplexer with synthetic dimensions. Based on this spatiotemporal modulation, a superposition of vortex beams with orthogonal OAMs and symmetric harmonics are both numerically and experimentally demonstrated. Also, flexible combinations of OAM modes with diverse frequency shifts are obtained by transforming the azimuthal phase distributions, which inspires a mode-frequency-division multiplexing approach that significantly promotes the communication capacity.

subjects

  • Materials science and engineering
  • Physics

keywords

  • acoustic communication; mode-frequency-division multiplexing; multiplexing technology; spatiotemporal metasurface