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Tunable Multiple-Step Plasmonic Bragg Reflectors with Graphene-Based Modulated Grating.

Qinglu Qian1, Youjian Liang2, Yue Liang3

  • 1School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi 214122, China. qianqinglu0915@163.com.

Sensors (Basel, Switzerland)
|December 6, 2016
PubMed
Summary

We developed a novel graphene-based plasmonic Bragg reflector (PBR) with a multi-step silicon structure for mid-infrared applications. This innovation reduces insertion loss and enables ultra-compact, low-cost hyperspectral sensors.

Keywords:
Bragg grating sensorfinite element methodmetal-insulator-metalplasmonics

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Area of Science:

  • Photonics and Plasmonics
  • Materials Science
  • Mid-Infrared Optics

Background:

  • Plasmonic Bragg reflectors (PBRs) are crucial for optical devices.
  • Graphene offers tunable optical properties via electric field modulation.
  • Existing PBR designs face challenges with insertion loss and spectral ripple.

Purpose of the Study:

  • To propose a novel PBR utilizing graphene and a multi-step silicon structure.
  • To investigate the modulation of graphene's optical properties for refractive index control.
  • To enhance PBR performance by reducing insertion loss and suppressing spectral ripple.

Main Methods:

  • Fabrication of a PBR with monolayer graphene on a multiple-step silicon structure.
  • Electrical modulation of graphene's optical properties using external bias voltage.
  • Analysis of transmission spectra to evaluate insertion loss, ripple, and resonance modes.

Main Results:

  • The multi-step structure significantly decreased insertion loss and suppressed transmission spectra ripple.
  • Introducing defects into the PBR created multiple resonance modes within the stopband.
  • Tunable optical properties of graphene were achieved in the mid-infrared region.

Conclusions:

  • The proposed graphene-based multi-step PBR offers improved performance for mid-infrared applications.
  • Defect engineering in these PBRs allows for the formation of multiple resonance modes.
  • This technology holds promise for developing ultra-compact, low-cost hyperspectral sensors.