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Published on: April 4, 2017
Highly sensitive plasmonic sensing based on a topological insulator nanoparticle.
Dikun Li1, Hua Lu1, Shouhao Shi1
1MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Key Laboratory of Light-Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, 710129, China. hualu@nwpu.edu.cn.
Topological insulator nanoparticles demonstrate localized surface plasmon resonance for high-sensitivity refractive index sensing. These novel plasmonic nanosensors offer promising applications in nanophotonics.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Topological insulators (TIs) are Dirac materials with unique optical and electrical properties.
- TIs enable surface plasmon generation across a broad spectrum, suitable for advanced devices.
Purpose of the Study:
- To fabricate antimony telluride (Sb2Te3) topological insulator nanoparticles.
- To experimentally demonstrate high-performance refractive index nanosensing using these TI nanoparticles.
Main Methods:
- Magnetron sputtering and focused ion beam (FIB) lithography for nanoparticle fabrication.
- Experimental characterization of localized surface plasmon resonance (LSPR) in TI nanoparticles.
- Finite-difference time-domain (FDTD) numerical simulations for validation.
Main Results:
- Sb2Te3 TI nanoparticles exhibit tunable LSPR dependent on nanoparticle dimensions.
- Achieved high refractive index sensitivity of 443 nm RIU⁻¹ for nanoscale sensing.
- Experimental findings align well with FDTD simulations.
Conclusions:
- TI nanoparticles can effectively support LSPR for plasmonic sensing.
- This work introduces a novel approach for developing high-performance plasmonic nanosensors.
- Highlights potential for TI materials in nanophotonic device applications.
