Related Experiment Video
Updated: May 11, 2026
Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
Stable, high-performance sodium-based plasmonic devices in the near infrared
Yang Wang1, Jianyu Yu1, Yi-Fei Mao2
1National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, People's Republic of China.
Stable sodium-based plasmonic devices offer superior performance at near-infrared wavelengths. These novel materials overcome the limitations of noble metals, paving the way for advanced photonic and metamaterial applications.
Area of Science:
- * Materials Science and Nanophotonics
Background:
- * Plasmonics allows light manipulation beyond the diffraction limit, enabling applications in photonic devices, cloaking, sensing, and imaging.
- * A major challenge in plasmonics is parasitic Ohmic loss in noble metal-based devices, which limits performance.
- * There is a long-standing need for plasmonic materials with lower loss than traditional noble metals.
Purpose of the Study:
- * To develop stable, low-loss plasmonic devices with enhanced performance at near-infrared wavelengths.
- * To explore the potential of sodium as a plasmonic material, surpassing noble metal limitations.
Main Methods:
- * Fabrication of high-quality sodium films using a thermo-assisted spin-coating process.
- * Characterization of electron relaxation times and surface plasmon polariton propagation lengths.
- * Demonstration of a room-temperature sodium-based plasmonic nanolaser.
Main Results:
- * Achieved high-quality sodium films with electron relaxation times up to 0.42 picoseconds.
- * Demonstrated a surface plasmon polariton propagation length of 200 micrometers at the sodium-quartz interface.
- * Reported a low lasing threshold of 140 kW/cm² for a room-temperature sodium-based plasmonic nanolaser.
- * Sodium-based devices exhibited stable performance under ambient conditions for several months.
Conclusions:
- * Stable sodium-based plasmonic devices offer state-of-the-art performance at near-infrared wavelengths, outperforming noble metal-based devices.
- * These findings have significant implications for advancing plasmonics, nanophotonics, and metamaterials.
- * Sodium presents a promising alternative plasmonic material for next-generation optical applications.
