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Dynamically modulating the surface plasmon resonance of doped semiconductor nanocrystals
Guillermo Garcia1, Raffaella Buonsanti, Evan L Runnerstrom
1The Molecular Foundry, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
Nano Letters
|August 24, 2011
Summary
Researchers demonstrate dynamic tuning of semiconductor nanocrystal surface plasmons using electrochemical methods. This approach allows for significant shifts in plasmon wavelength without material degradation, offering new possibilities for optical applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Semiconductor nanocrystals exhibit localized surface plasmon resonance (LSPR) at high doping levels, typically in the near-infrared spectrum.
- Tuning LSPR in these materials is crucial for advanced optical and electronic applications.
Purpose of the Study:
- To investigate the dynamic and reversible tuning of surface plasmons in tin-doped indium oxide nanocrystal films.
- To achieve significant shifts in plasmon wavelength and carrier density without causing material degradation.
Main Methods:
- Utilized postsynthetic electrochemical modulation to alter the electron concentration in tin-doped indium oxide nanocrystal films.
- Monitored changes in localized surface plasmon absorption features and carrier density.
Main Results:
- Achieved a dynamic and reversible tuning of surface plasmons.
- Induced a > 1200 nm shift in the plasmon wavelength.
- Modulated the carrier density by a factor of nearly three without ion intercalation or material degradation.
Conclusions:
- Electrochemical modulation offers a viable method for tuning surface plasmons in semiconductor nanocrystals.
- This technique enables significant control over optical properties without compromising material integrity.
- Opens avenues for tunable plasmonic devices and advanced optical materials.
