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Terahertz response of plasmonic nanoparticles: Plasmonic Zeeman Effect
Optics Express
|December 31, 2020
Summary
We studied magnetoplasmons, the interaction between magnetic fields and plasmons in nanoparticles. Applying a magnetic field splits plasmonic modes, similar to the Zeeman effect, with shifts proportional to the field strength.
Area of Science:
- Condensed matter physics
- Plasmonics
- Quantum optics
Background:
- Plasmons are collective oscillations of electrons in materials.
- Magnetoplasmons describe the coupling of plasmons with external magnetic fields.
- Understanding these interactions is crucial for developing novel optical and electronic devices.
Purpose of the Study:
- To theoretically investigate the plasmonic response of nanoparticles under an applied magnetic field.
- To analyze the splitting of plasmonic modes and its relation to magnetic field strength.
- To explore the potential for magnetoplasmonics in various materials.
Main Methods:
- Theoretical study in the quasi-static limit.
- Analysis of plasmonic modes in nanoparticles subjected to a constant magnetic field.
- Comparison with the Zeeman effect in atomic physics.
Main Results:
- Plasmonic modes split into two satellite peaks.
- The frequency shift is proportional to the applied magnetic field, determined by the effective Bohr magneton.
- Non-linear frequency shifts occur at higher magnetic fields, analogous to the non-linear Zeeman effect.
Conclusions:
- The study provides a theoretical framework for understanding magnetoplasmonic effects in nanoparticles.
- The observed splitting phenomenon offers a new avenue for magnetic field sensing and manipulation of light.
- The findings are applicable to any material exhibiting plasmonic behavior.
