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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

Backward propagating slow light in inverted plasmonic taper.

Eyal Feigenbaum¹, Meir Orenstein

¹EE Department, Technion, Haifa 32000, Israel.

|February 17, 2009

Summary

The study identifies a backward wave in thin plasmonic gaps, characterized by negative dispersion above surface plasmon frequency. This slow-light mode exhibits inverse geometrical cutoff behavior with increasing gap width.

Area of Science:

Physics
Materials Science
Nanotechnology

Background:

Surface plasmon polaritons (SPPs) are fundamental to plasmonics.
Understanding wave propagation in nanostructured materials is crucial for optical device development.
Negative dispersion and slow-light phenomena offer unique opportunities for light manipulation.

Purpose of the Study:

To investigate the nature of the TM1 mode in thin plasmonic gaps.
To analyze the dispersion characteristics and group velocity of this mode.
To explore the relationship between gap width and cutoff behavior.

Main Methods:

Theoretical analysis of electromagnetic wave propagation.
Modeling of thin plasmonic gap structures.
Investigation of TM1 mode properties, including dispersion and group velocity.

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Main Results:

The TM1 mode exhibits negative dispersion at frequencies above the surface plasmon frequency.
This mode is identified as a backward wave due to causality.
The mode demonstrates slow-light characteristics with a small positive group velocity.
Inverse geometrical cutoff is observed: the cutoff frequency decreases as the gap width increases.

Conclusions:

The TM1 mode in thin plasmonic gaps behaves as a backward wave, offering novel propagation properties.
The slow-light nature and inverse geometrical cutoff characteristics present opportunities for designing advanced plasmonic devices.
This research contributes to the fundamental understanding of wave phenomena in nanoplasmonic systems.