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Dark plasmonic mode based perfect absorption and refractive index sensing.

W H Yang1, C Zhang, S Sun

  • 1State Key Laboratory on Tunable Laser Technology, Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, China518055. shumin.xiao@hit.edu.cn qinghai.song@hit.edu.cn.

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Summary
This summary is machine-generated.

Researchers developed a simple method to excite dark plasmonic modes in silver gratings using normal incident light, enabling perfect absorption and enhanced sensitivity for refractive index sensing applications.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Optical Metamaterials

Background:

  • Dark plasmonic resonances are crucial for applications like sensing and nanolasers.
  • Exciting dark modes experimentally is challenging, limiting practical uses.

Purpose of the Study:

  • To demonstrate a straightforward experimental method for exciting quadrupolar and higher-order plasmonic modes.
  • To investigate the properties and potential applications of these excited dark modes.

Main Methods:

  • Directionally depositing silver films onto sidewalls of metal-covered 1D gratings.
  • Experimental observation of asymmetrical resonances and perfect absorption.
  • Numerical simulations to identify the resonances as dark modes.

Main Results:

  • Successfully excited dark modes (quadrupolar and higher-order) using normal incident light.
  • Observed perfect absorption with near-zero reflection and transmission coefficients.
  • Demonstrated high refractive index sensitivity (458 nm/RIU) for the excited dark modes.

Conclusions:

  • The developed method provides a practical way to excite dark plasmonic modes.
  • These dark modes exhibit excellent sensitivity for refractive index sensing.
  • This research opens new avenues for utilizing dark surface plasmons in various applications.