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Angle resolved transmission through metal hole gratings
Optics Express
|April 26, 2017
Summary
We measured extraordinary optical transmission (EOT) through gold gratings, improving signal-to-noise for hole emission patterns. Our method separates direct and resonant EOT contributions, showing agreement for s-polarized light but unexplained deviations for p-polarized light.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Extraordinary optical transmission (EOT) through subwavelength hole arrays is a key phenomenon in nanophotonics.
- Understanding the angular emission patterns of individual holes within gratings is crucial for controlling light propagation.
- Previous studies often lacked the resolution to fully decouple different contributions to EOT.
Purpose of the Study:
- To perform the first angle-resolved measurements of EOT through hole array gratings.
- To develop a method for separately determining the direct and resonant contributions to EOT.
- To compare experimental results with theoretical models and simulations for different polarizations.
Main Methods:
- Angle-resolved measurements of EOT through gold hole array gratings.
- Systematic variation of lattice spacing and analysis of higher diffraction orders.
- Spectral analysis of diffraction orders combined with an established model to separate EOT contributions.
- Comparison with single-hole transmission data, Coupled Mode Model (CMM), and Finite Difference Time Domain (FDTD) simulations.
Main Results:
- Achieved improved signal-to-noise ratio for retrieving angular emission patterns of constituent holes compared to single-hole experiments.
- Successfully developed and applied a method to distinguish between direct and resonant contributions to EOT.
- Observed good agreement between experimental results and single-hole transmission for s-polarized light.
- Identified deviations between experimental data and theoretical predictions for p-polarized light.
Conclusions:
- Angle-resolved EOT measurements provide a powerful tool for characterizing nanostructured optical devices.
- The developed method effectively separates direct and resonant EOT components.
- Discrepancies in p-polarized light transmission highlight limitations in current theoretical models and necessitate further investigation.
- Further research is needed to fully understand the observed deviations for p-polarized light in EOT phenomena.
