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Generation of diffraction-free optical beams using wrinkled membranes.

Ran Li1, Hui Yi, Xiao Hu

  • 11] University of Michigan - Shanghai Jiao Tong University Joint Institute, National Key Laboratory of Nano/Micro Fabrication Technology, Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China [2].

Scientific Reports
|September 28, 2013
PubMed
Summary

Researchers created optical focusing using wrinkled membranes. Concentric wrinkle rings on gold-polydimethylsiloxane (PDMS) bilayers transform light into focused beams, paving the way for new optical devices.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Wrinkling is a decade-old bottom-up technique for creating artificial surface textures.
  • The optical properties of ordered wrinkles have been primarily limited to one-dimensional gratings.
  • Developing advanced optical components from textured surfaces remains an active research area.

Purpose of the Study:

  • To demonstrate macroscopic optical focusing using wrinkled membranes.
  • To investigate the potential of ordered wrinkle patterns for light manipulation.
  • To explore the application of gold-polydimethylsiloxane (PDMS) bilayer membranes in optics.

Main Methods:

  • Fabrication of a gold-PDMS bilayer membrane exhibiting concentric wrinkle rings.
  • Utilizing the wrinkled membrane to convert collimated light into focused beams.
  • Experimental measurement and theoretical analysis of beam characteristics, including diameter and eccentricity.

Main Results:

  • Demonstrated macroscopic optical focusing with beam diameters of 300-400 μm in the visible range.
  • Observed that beam diameter is significantly influenced by device eccentricity.
  • Theoretical and experimental results showed strong agreement regarding eccentricity effects.

Conclusions:

  • Concentric wrinkle rings on gold-PDMS membranes can achieve optical focusing.
  • Eliminating eccentricity in device design could reduce beam diameter to approximately 50 μm.
  • This work opens possibilities for novel optical devices based on engineered surface textures.