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Related Experiment Video

Updated: May 13, 2026

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy
08:54

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Published on: June 5, 2019

Sub-diffraction phase-contrast imaging of transparent nano-objects by plasmonic lens structure.

Na Yao1, Changtao Wang, Xing Tao

  • 1State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Science, PO Box 350, Chengdu 610209, People's Republic of China.

Nanotechnology
|March 13, 2013
PubMed
Summary

We developed a novel metal-insulator-metal plasmonic lens for sub-diffraction phase-contrast imaging of transparent nano-objects. This new structure enhances scattered light and suppresses illumination, achieving 64 nm resolution.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Optical Imaging

Background:

  • Transparent nano-objects are challenging to image due to their low refractive index contrast.
  • Sub-diffraction imaging techniques are crucial for nanoscale characterization.

Purpose of the Study:

  • To propose and numerically demonstrate a plasmonic lens for sub-diffraction phase-contrast imaging.
  • To enhance imaging of transparent nano-objects with high resolution.

Main Methods:

  • Design of a specialized metal-insulator-metal (MIM) plasmonic lens structure.
  • Embedding nano-objects within the insulator layer of the MIM structure.
  • Numerical simulation of surface plasmon excitation and light scattering.

Main Results:

  • Achieved a spatial resolution of approximately 64 nm.
  • Demonstrated a minimum distinguishable refractive index difference of 0.05.
  • The optimized MIM structure outperformed a superlens for imaging irregular 3D nanowires and nanocylinders.

Conclusions:

  • The proposed MIM plasmonic lens enables high-resolution phase-contrast imaging of transparent nano-objects.
  • This approach significantly enhances scattered light and suppresses transmitted light for improved contrast.
  • The MIM structure offers superior performance compared to conventional superlenses for specific nanoscale imaging applications.