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Nonlinear Refractory Plasmonics with Titanium Nitride Nanoantennas
Lili Gui1, Shahin Bagheri1, Nikolai Strohfeldt1
14th Physics Institute and Research Center SCoPE, University of Stuttgart , Pfaffenwaldring 57, 70569 Stuttgart, Germany.
Nano Letters
|August 6, 2016
Summary
Titanium nitride (TiN) nanoantennas are robust plasmonic materials for high-power applications. They withstand high laser intensities, outperforming gold antennas and enabling new nanoscale technologies.
Area of Science:
- Materials Science
- Nanotechnology
- Plasmonics
Background:
- Titanium nitride (TiN) is a refractory plasmonic material with significant optical nonlinearities.
- High-power nonlinear plasmonic applications require materials that can sustain high temperatures and laser intensities.
Purpose of the Study:
- To fabricate and characterize titanium nitride (TiN) nanoantenna arrays for high-power plasmonic applications.
- To investigate the nonlinear optical properties and laser power sustainability of TiN nanoantennas.
Main Methods:
- Fabrication of TiN nanoantenna arrays with tunable plasmonic resonances (950-1050 nm).
- Second-harmonic (SH) spectroscopy analysis using a nonlinear oscillator model.
- Characterization of material robustness under high peak laser intensity (up to 15 GW/cm²).
Main Results:
- TiN nanoantennas exhibit tunable plasmonic resonances.
- The material shows a wavelength-dependent second-order nonlinear response.
- TiN antennas demonstrated exceptional laser power sustainability, enduring 15 GW/cm² without optical or physical degradation, outperforming gold antennas by tenfold.
Conclusions:
- TiN nanoantennas are highly robust and suitable for high-power/high-temperature plasmonic applications.
- These nanoantennas show promise for use in coherent nonlinear converters and nanoscale heat sources.
