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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.

|January 19, 2023

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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.

Keywords:

chemical modulation doping indium tin oxide localized surface plasmon resonance metal oxide nanocrystals near-field enhancement

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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.