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Area of Science:

  • * Electromagnetism and Optics
  • * Non-Hermitian Physics
  • * Plasmonics

Background:

  • * Space and guided electromagnetic waves are fundamental to wireless and integrated applications.
  • * Anti-parity-time (APT) symmetry, from non-Hermitian quantum mechanics, has been effective for guided waves but not space waves.
  • * Existing methods typically develop radiative and integrated devices separately.

Purpose of the Study:

  • * To propose and demonstrate a radiative plasmonic APT design for harnessing space waves.
  • * To experimentally realize novel phenomena in APT physics for space waves.
  • * To explore the potential of APT symmetry in radiative devices.

Main Methods:

  • * Development of a radiative plasmonic anti-parity-time (APT) design.
  • * Experimental demonstration using subwavelength designer-plasmonic structures.
  • * Investigation of polarization-controlled and angle-dependent APT phase transitions.

Main Results:

  • * Successful harnessing of space waves using a radiative plasmonic APT system.
  • * Observation of polarization-controlled APT phase transition by rotating incident wave polarizations.
  • * Observation of multi-stage APT phase transition by tuning incidence angles in higher-order APT systems.

Conclusions:

  • * The proposed scheme successfully demonstrates novel APT physics for space waves.
  • * The design enables unprecedented control over APT phase transitions.
  • * This work paves the way for APT-symmetry-empowered radiative devices.