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Flexible Thermo-Optic Variable Attenuator based on Long-Range Surface Plasmon-Polariton Waveguides.

Jie Tang1,2, Yi-Ran Liu3,4, Li-Jiang Zhang5

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|November 15, 2018
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Summary

A flexible thermo-optic variable attenuator using long-range surface plasmon-polariton waveguides was developed. This device offers efficient amplitude control for microwave photonic systems and high-speed data transmission.

Keywords:
microwave photonicssurface plasmon-polariton (SPP)variable optical attenuator (VOA)

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Area of Science:

  • Photonics
  • Materials Science
  • Optoelectronics

Background:

  • Microwave photonic systems require efficient amplitude control components.
  • Flexible plasmonic waveguides offer potential for miniaturized optical devices.

Purpose of the Study:

  • To investigate a flexible thermo-optic variable attenuator based on long-range surface plasmon-polariton (LRSPP) waveguides.
  • To optimize the design for microwave photonic applications.

Main Methods:

  • Utilized low-loss polymer materials and a silver strip for LRSPP waveguide fabrication.
  • Employed finite element method (FEM) for optimizing thermal and optical field distributions.
  • Characterized the device using a 1550 nm laser and measured transmission performance in a broadband microwave photonics link.

Main Results:

  • Achieved a propagation loss of approximately 1.92 dB/cm for the LRSPP waveguide.
  • Demonstrated a maximum optical signal attenuation of 28 dB at a driving voltage of 4.17 V.
  • Observed variable attenuation of microwave signals by adjusting the driving voltage.

Conclusions:

  • The flexible plasmonic variable attenuator shows promise for chip-scale interconnection in photonic integrated circuits.
  • The device is suitable for data transmission and amplitude control in microwave photonic systems.