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Actively tunable bistable optical Yagi-Uda nanoantenna.

Ivan S Maksymov1, Andrey E Miroshnichenko, Yuri S Kivshar

  • 1Nonlinear Physics Centre and Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Research School of Physics and Engineering, The Australian National University, Canberra, ACT 0200, Australia. mis124@physics.anu.edu.au

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We introduce tunable optical Yagi-Uda nanoantennas. These novel devices offer broadband, unidirectional light emission and bistable control, advancing subwavelength optics beyond current limitations.

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Area of Science:

  • Nanophotonics
  • Plasmonics
  • Optical Nanoantennas

Background:

  • Traditional Yagi-Uda nanoantennas are often narrowband and lack tunability.
  • Achieving controlled, directional light emission at the nanoscale is crucial for advanced optical applications.

Purpose of the Study:

  • To propose and theoretically demonstrate a novel, tunable optical Yagi-Uda nanoantenna.
  • To explore broadband and bistable emission characteristics for ultrafast light control.

Main Methods:

  • Theoretical demonstration of a Yagi-Uda nanoantenna design.
  • Incorporation of a semiconductor disk in a metallic dipole feeding element for carrier density tuning.
  • Analysis of optical emission properties, including directionality and bandwidth.

Main Results:

  • The proposed nanoantenna exhibits broadband unidirectional emission.
  • A bistable response in the far-field emission is demonstrated.
  • Tunability is achieved by varying the free-carrier density of the semiconductor disk.

Conclusions:

  • The novel tunable nanoantenna offers advantages over narrowband, fixed counterparts.
  • This design enables unique possibilities for ultrafast control of subwavelength light.
  • Potential applications in advanced optical circuits and nanoscale light manipulation.