Strong THz to IR thermal radiation from random metallic nanostructures by femtosecond laser excitation

Liangliang Zhang; Kaijun Mu; Ji Zhao; Tong Wu; Hai Wang; Cunlin Zhang

doi:10.1117/12.2192952

12 August 2015 Strong THz to IR thermal radiation from random metallic nanostructures by femtosecond laser excitation

Liangliang Zhang, Kaijun Mu, Ji Zhao, Tong Wu, Hai Wang, Cunlin Zhang

Proceedings Volume 9625, 2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications; 962509 (2015) https://doi.org/10.1117/12.2192952
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

Abstract

We report intense (~10 mW), ultra-broadband (~150 THz wide), terahertz-to-infrared, Gaussian-wavefront emission from nanopore-structured metallic thin films under femtosecond laser pulse irradiation. The proposed underlying mechanism is thermal radiation. The nanostructures of the metal film are produced by random holes in the substrate. Under pulse-train femtosecond laser irradiation, we found dramatically enhanced optical absorption, with an absorptivity that was equal to as much as 95% of the metallic surface nanostructure, due to both an antireflection mechanism and dissipation of excited surface plasmon polaritons into the metal surface.

Citation Download Citation

Liangliang Zhang, Kaijun Mu, Ji Zhao, Tong Wu, Hai Wang, and Cunlin Zhang "Strong THz to IR thermal radiation from random metallic nanostructures by femtosecond laser excitation", Proc. SPIE 9625, 2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications, 962509 (12 August 2015); https://doi.org/10.1117/12.2192952

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