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Highly Responsive Plasmon Modulation in Dopant-Segregated Nanocrystals
Bharat Tandon1, Stephen L Gibbs1, Christopher Dean1
1McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, United States.
Nano Letters
|January 19, 2023
Summary
We engineered tin-doped indium oxide nanocrystals with dopant segregation to dynamically tune their infrared light interactions. This method enables significant control over optical properties for advanced photonic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Electron transfer in metal oxide nanocrystals (NCs) influences their infrared localized surface plasmon resonance (LSPR).
- Understanding and controlling LSPR is crucial for photophysics and dynamic optical applications.
Purpose of the Study:
- To investigate the impact of radial dopant segregation in Sn-doped In2O3 NCs on LSPR modulation and near-field enhancement (NFE).
- To explore dopant segregation as a strategy for engineering dynamic optical modulation in semiconductor heterostructures.
Main Methods:
- Synthesis and chemical reduction of dopant-segregated Sn-doped In2O3 NCs.
- Experimental investigation of LSPR shifts and NFE changes during chemical titration.
- Computational simulations to understand the underlying mechanisms of LSPR modulation.
Main Results:
- Core-doped NCs exhibited substantial LSPR shifts (>1000 cm-1) and peak extinction changes (>300%) upon chemical reduction.
- Simulations indicated that LSPR evolution is driven by increased surface Fermi level and donor defect density in the shell.
- Demonstrated broadband modulation of optical properties through dopant segregation.
Conclusions:
- Dopant segregation is an effective strategy for precise engineering of dynamic optical modulation in plasmonic semiconductor NCs.
- This approach offers advantages over conventional plasmonic metals for tunable optical applications.
- The findings provide fundamental insights into the photophysics of doped metal oxide NCs.
