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Plasmonic phase modulator based on novel loss-overcompensated coupling between nanoresonator and waveguide.

Song-Jin Im1,2, Gum-Song Ho1, Da-Jie Yang2,3

  • 1Department of Physics, Kim Il Sung University, Pyongyang, Democratic People's Republic of Korea.

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We demonstrate a novel nanoscale plasmonic phase modulator. This device achieves a significant phase shift with low energy consumption, enabling efficient optical signal modulation.

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Area of Science:

  • Photonics and Nanotechnology
  • Optical Communications

Background:

  • Surface plasmon polaritons (SPPs) are essential for nanoscale optical devices.
  • Controlling SPP phase shifts is crucial for optical modulation and signal processing.

Purpose of the Study:

  • To develop a highly efficient nanoscale plasmonic phase modulator.
  • To achieve a large phase shift with broadband, flat transmission.
  • To enable low-energy optical modulation for advanced photonic circuits.

Main Methods:

  • Side-coupling SPPs to a gain-assisted nanoresonator.
  • Overcompensating absorption in the nanoresonator to achieve gain.
  • Modulating the plasmonic phase shift using a pumping signal.

Main Results:

  • Achieved a prominent phase shift up to π with flat unity transmission across broad spectra.
  • Demonstrated controllable phase shift bandwidth up to 100 GHz by adjusting waveguide-resonator distance.
  • Realized nanoscale device length and low energy consumption (10 fJ/bit).

Conclusions:

  • The proposed device offers a compact and energy-efficient solution for plasmonic phase modulation.
  • Potential applications include nanoscale Mach-Zehnder interferometers and phase shift keying modulators.
  • This technology advances nanoscale optical signal processing and communication.