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Preparation and characteristic analysis of nanofacula array.

Lina Shao1,2, Xin Tian3, Shengxiang Ji4

  • 1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, Jilin, China.

Scientific Reports
|November 13, 2021
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Summary

A novel nanofacua array fabricated using metal nanopore arrays improves Near-field Scanning Optical Microscopy (NSOM) performance for high-throughput scanning. This method enhances electric fields, enabling fast super-resolution focusing.

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Area of Science:

  • Nanotechnology
  • Optical Microscopy
  • Materials Science

Background:

  • Near-field Scanning Optical Microscopy (NSOM) requires improved performance for high-throughput array scanning.
  • Nanofacua arrays offer a potential solution for enhancing NSOM capabilities.

Purpose of the Study:

  • To develop and characterize a nanofacua array for improved NSOM performance.
  • To investigate the impact of metal film properties on nanofacua array fabrication.
  • To achieve high-energy focused nanofacua arrays for fast super-resolution imaging.

Main Methods:

  • Fabrication of metal nanopore arrays using a double-layer resist process and lift-off technique.
  • Investigation of shading coefficients for gold-palladium (Au/Pd), platinum (Pt), and chromium (Cr) films.
  • Finite Difference and Time Domain (FDTD) simulations to analyze optical field enhancement.

Main Results:

  • Au/Pd film with approximately 23 nm thickness and a shading coefficient ≥90% was identified as optimal.
  • Irradiation through the fabricated metal nanopore array generated a nanofacua array.
  • FDTD simulations confirmed a 3.2x electric field enhancement by combining nanopore and microlens arrays.

Conclusions:

  • The developed nanofacua array fabrication method is effective for enhancing NSOM.
  • Optimized metal film properties and array design lead to significant optical field enhancement.
  • This approach provides a new strategy for achieving fast super-resolution focusing in NSOM.