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Related Experiment Video

Updated: Jan 8, 2026

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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One-dimensional dielectric grating structure for plasmonic coupling and routing.

Lam Yen Thi Nguyen1, Yu-Cheng Lin1, Tzu-Yu Chiu1

  • 1Department of Physics, National Chung Cheng University, 168, Sec. 1, University Road, Min-Hsiung, Chiayi, 621, Taiwan.

Nanophotonics (Berlin, Germany)
|December 22, 2025
PubMed
Summary

We developed novel 1D titanium dioxide (TiO2) dielectric gratings to efficiently couple light into surface plasmon polaritons (SPPs) and route them in plasmonic waveguides. These compact devices offer high efficiency and polarization selectivity for integrated photonic circuits.

Keywords:
plasmonic 1-D grating structuresplasmonic couplingplasmonic routingsurface plasmon polaritons

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Area of Science:

  • Plasmonics and Nanophotonics
  • Integrated Optics
  • Materials Science

Background:

  • Coupling free-space light into surface plasmon polaritons (SPPs) is crucial for integrated plasmonic circuits.
  • Existing methods often lack efficiency, compactness, or multifunctional capabilities for SPP manipulation.
  • Dielectric gratings offer a promising route for controlling light-matter interactions at the nanoscale.

Purpose of the Study:

  • To propose and demonstrate one-dimensional (1-D) TiO2 dielectric grating structures for efficient light-to-SPP coupling.
  • To investigate the capability of these gratings to guide and route two-dimensional (2-D) SPPs into 1-D plasmonic waveguides.
  • To evaluate the performance metrics including coupling efficiency, polarization selectivity, bandwidth, and footprint.

Main Methods:

  • Design of 1-D TiO2 dielectric gratings comprising a central stripe and periodic teeth.
  • Finite-difference time-domain (FDTD) simulations to analyze electromagnetic field distributions, coupling mechanisms, and routing efficiencies.
  • Experimental validation of simulated coupling efficiencies and polarization-dependent behavior.

Main Results:

  • Optimized symmetric TiO2 gratings achieved a maximum simulated coupling efficiency of 19.1% for 793-nm light into 1-D SPPs.
  • Experimental results confirmed high coupling efficiencies of ~13% for symmetric gratings, with strong TM polarization selectivity.
  • The gratings demonstrated SPP routing capabilities, with asymmetric designs achieving 5.7% simulated routing efficiency into 1-D waveguides.

Conclusions:

  • 1-D TiO2 dielectric gratings provide an efficient and compact platform for coupling free-space light into guided 1-D SPPs.
  • These structures enable multifunctional SPP manipulation, including routing, with high polarization selectivity.
  • The demonstrated figure of merit (efficiency/area) is the highest reported for direct free-space to 1-D SPP waveguide coupling, paving the way for advanced integrated plasmonic circuits.