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Local heating with lithographically fabricated plasmonic titanium nitride nanoparticles.
Urcan Guler1, Justus C Ndukaife, Gururaj V Naik
1School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University , West Lafayette, Indiana 47907, United States.
Nano Letters
|November 28, 2013
Summary
Titanium nitride nanodisks are efficient heat sources, outperforming gold nanoparticles in the near-infrared biological transparency window. This finding simplifies designs for plasmonic applications.
Area of Science:
- Nanotechnology
- Materials Science
- Biomedical Optics
Background:
- Titanium nitride (TiN) exhibits localized surface plasmon resonances (LSPRs) in the near-infrared (NIR) biological transparency window.
- Plasmonic nanoparticles are crucial for applications requiring localized heating.
- Gold nanoparticles are commonly used but have limitations in the NIR region.
Purpose of the Study:
- To compare the local heating efficiencies of titanium nitride (TiN) and gold (Au) nanodisks.
- To evaluate their performance in both visible and near-infrared spectral regions.
- To assess TiN as a potential alternative to gold for plasmonic heating applications.
Main Methods:
- Fabrication of disk-shaped TiN and Au nanoparticles using e-beam lithography.
- Numerical simulations to model optical properties and heating efficiencies.
- Experimental characterization of nanoparticle performance in visible and NIR regions.
Main Results:
- Plasmonic TiN nanodisks demonstrate efficient local heat generation.
- TiN nanodisks outperform Au nanodisks in the biological transparency window (NIR region).
- The study validates TiN's potential as a superior plasmonic heating material.
Conclusions:
- Titanium nitride is a highly efficient plasmonic material for localized heating.
- TiN nanodisks offer advantages over gold, particularly in the NIR biological window.
- The findings simplify the design of plasmonic nanostructures by eliminating the need for complex geometries.
