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Thickness-Dependent Drude Plasma Frequency in Transdimensional Plasmonic TiN
Deesha Shah1, Morris Yang1, Zhaxylyk Kudyshev1
1School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States.
Nano Letters
|May 31, 2022
Summary
Researchers studied plasmonic transdimensional materials (TDMs), atomically thin metals, to understand their optical properties. Quantum confinement effects in ultrathin titanium nitride films were observed, influencing their optical response.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Atomically thin metals, known as plasmonic transdimensional materials (TDMs), offer tunable optical properties.
- Understanding the influence of thickness and surface passivation on TDMs is crucial for their application.
Purpose of the Study:
- To characterize the complex permittivity of ultrathin titanium nitride (TiN) films.
- To investigate the impact of quantum confinement on the optical properties of plasmonic TDMs.
- To validate theoretical models predicting thickness-dependent optical behavior.
Main Methods:
- Spectroscopic ellipsometry was used to measure the optical properties of TiN films.
- Ultrathin TiN films with thicknesses from 1 to 10 nm were fabricated and passivated.
- Experimental data was analyzed using nonlocal Drude dielectric response theory with the Keldysh-Rytova potential.
Main Results:
- The complex permittivity of passivated TiN films was determined.
- A decrease in plasma frequency and an increase in damping were observed in thinner films due to spatial confinement.
- Experimental trends were consistent with the Keldysh-Rytova model.
Conclusions:
- Quantum confinement significantly influences the optical properties of plasmonic transdimensional TiN.
- The Keldysh-Rytova model accurately predicts thickness-dependent optical behavior in these materials.
- This study demonstrates quantum-confinement-induced optical properties in plasmonic TDMs.
