Related Experiment Video
Updated: May 20, 2026
07:39
Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Liquid plasmonics: manipulating surface plasmon polaritons via phase transitions
S R C Vivekchand1, Clifford J Engel, Steven M Lubin
1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.
Nano Letters
|July 25, 2012
Summary
Researchers manipulated surface plasmon polaritons (SPPs) in liquid gallium (Ga) gratings. Liquid Ga showed enhanced SPP light coupling due to a broadened electronic band structure, offering new possibilities for plasmonic devices.
Area of Science:
- Plasmonics
- Materials Science
- Condensed Matter Physics
Background:
- Surface plasmon polaritons (SPPs) are crucial for nanoscale light manipulation.
- Controlling plasmonic properties through material phase transitions is an active research area.
Purpose of the Study:
- To investigate the manipulation of SPPs in gallium (Ga) gratings by inducing solid-to-liquid phase transitions.
- To understand the underlying mechanisms responsible for changes in plasmonic properties during phase change.
Main Methods:
- Fabrication of 1D Ga gratings using a molding process.
- Characterization of plasmonic properties in solid and liquid phases of Ga.
- Utilizing supercooling of Ga to extend the liquid phase temperature range.
- Ab initio density functional theory-molecular dynamic calculations.
Main Results:
- Gallium gratings exhibited distinct plasmonic properties in solid and liquid phases.
- Light coupled more efficiently to SPPs in the liquid phase of Ga.
- Supercooling enabled access to liquid-phase plasmonics up to 30 °C below bulk melting point.
- Broadening of the solid-state electronic band structure in liquid Ga was identified as the cause of enhanced plasmonics.
Conclusions:
- Phase transition in Ga gratings dynamically controls SPP behavior.
- Liquid Ga offers superior plasmonic performance compared to its solid state.
- Understanding electronic band structure changes is key to optimizing liquid metal plasmonics.
