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Guided Bloch surface waves on ultrathin polymeric ridges.

Emiliano Descrovi1, Tristan Sfez, Marzia Quaglio

  • 1Materials and Microsystems Laboratory, Politecnico di Torino, C.so Duca degli Abruzzi 24, IT-10129 Torino, Italy. emiliano.descrovi@polito.it

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Researchers guided Bloch surface waves (BSWs) on ultrathin polymer ridges, demonstrating low-loss waveguiding. This breakthrough enables precise light control for advanced sensing applications using nanometric structures.

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Area of Science:

  • Photonics and Nanotechnology
  • Surface Physics

Background:

  • Bloch surface waves (BSWs) are electromagnetic waves confined to the surface of periodic dielectric structures.
  • Guiding BSWs on nanostructures is crucial for developing novel photonic devices.

Purpose of the Study:

  • To demonstrate direct evidence of Bloch surface wave (BSW) waveguiding on ultrathin polymeric ridges.
  • To investigate the coupling and propagation characteristics of BSWs on nanometric dielectric structures.

Main Methods:

  • Near-field measurements were employed to directly observe BSWs.
  • A silicon-based multilayer structure was used to sustain near-infrared BSWs.
  • A prism-based configuration facilitated wavelength-selective BSW coupling.

Main Results:

  • BSWs were successfully coupled and guided along ultrathin dielectric ridges with low propagation losses.
  • Wavelength-selective coupling of BSWs was achieved both inside and outside the polymeric ridge.
  • Nanometric polymeric ridges demonstrated effective BSW waveguiding capabilities.

Conclusions:

  • Ultrathin polymeric ridges can effectively guide Bloch surface waves.
  • This technique offers precise control over light coupling for surface wave-based sensing.
  • The findings open opportunities for nanophotonic devices and sensing applications.