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Silver Nanowires for Reconfigurable Bloch Surface Waves.

Douguo Zhang1, Ruxue Wang1, Yifeng Xiang1

  • 1Institute of Photonics, Department of Optics and Optical Engineering, University of Science and Technology of China , Hefei, Anhui 230026, China.

ACS Nano
|September 19, 2017
PubMed
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Researchers propose using a single silver nanowire to convert free space light beams into Bloch surface waves on dielectric multilayers. This flexible method allows for controlled focusing and dynamic manipulation of these waves for various optical applications.

Area of Science:

  • Nanophotonics
  • Surface Physics
  • Optics

Background:

  • Bloch surface waves (BSWs) are electromagnetic waves confined to the surface of periodic dielectric structures.
  • Efficiently coupling free-space light into BSWs is crucial for various photonic applications.
  • Existing methods often require complex setups or specialized materials.

Purpose of the Study:

  • To propose a novel and flexible method for generating and controlling Bloch surface waves.
  • To utilize a single silver nanowire as a coupler for transforming free-space beams into BSWs.
  • To demonstrate the dynamic control and focusing capabilities of the proposed system.

Main Methods:

  • Employing a single silver nanowire as a flexible coupler.
  • Utilizing Huygens' Principle to explain the generation of BSWs from a focused Gaussian beam on the nanowire.
Keywords:
dielectric multilayerreconfigurable Bloch surface wavesilver nanowiresspatial light modulator

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  • Implementing a spatial light modulator (SLM) for active control of the incident laser beam's spatial phase.

    • Main Results:

    • Demonstrated the transformation of a free-space Gaussian beam into a BSW propagating on a dielectric multilayer using a silver nanowire.
    • Showed that curving the nanowire allows for focusing of the generated surface wave.
    • Achieved reconfigurable and dynamically controlled BSWs by manipulating the incident beam's phase via an SLM.

    Conclusions:

    • A single silver nanowire serves as an effective and flexible coupler for generating BSWs.
    • The proposed method offers dynamic control over BSWs, enabling focusing and reconfiguration.
    • This low-cost, flexible approach holds significant promise for applications in optical micromanipulation, fluorescence imaging, and sensing.