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Plasmonic band gap engineering of plasmon-exciton coupling
Optics Letters
|November 1, 2014
Summary
Researchers engineered plasmonic band gaps in metal films to control plasmon-exciton coupling. Band gap engineering allows tuning the interaction between light and matter, impacting optical properties.
Area of Science:
- Condensed Matter Physics
- Nanophotonics
- Materials Science
Background:
- Plasmon-exciton coupling is crucial for light-matter interactions.
- Controlling this coupling is key for advanced optical devices.
- Plasmonic crystals offer a platform for manipulating plasmon resonances.
Purpose of the Study:
- To demonstrate control over plasmon-exciton coupling via plasmonic band gap engineering.
- To investigate resonant coupling between molecular and plasmonic resonances.
- To explore the role of grating profile contrast in band gap formation.
Main Methods:
- Fabrication of a one-dimensional sinusoidal grating on a metal surface using laser interference lithography.
- Utilizing the Kretschmann configuration for surface plasmon polariton excitation.
- Employing polarization-dependent spectroscopic reflection measurements.
Main Results:
- A plasmonic band gap was observed due to Bragg scattering of surface plasmon polaritons.
- The grating profile contrast was found to determine the plasmonic band gap width.
- Plasmon-exciton interaction was attenuated within the band gap region along the grating direction.
Conclusions:
- Band gap engineering of plasmonic crystals provides a method to control plasmon-exciton coupling.
- The spectral overlap between molecular and plasmonic resonances can be tuned.
- This approach offers potential for designing novel optical materials and devices.
