Femtosecond laser-induced surface structures to significantly improve the thermal emission of light from metals |
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| Authors: | J. Yang Y. Yang B. Zhao Y. Wang X. Zhu |
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| Affiliation: | (1) Institute of Modern Optics, Nankai University, Key Laboratory of Optical Information Science and Technology, Education Ministry of China, Tianjin, 300071, China;(2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi’an, Shaanxi, 710119, China |
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| Abstract: | Extraordinary thermal emission properties of the metallic surface microstructures induced by femtosecond lasers are investigated in both experiment and theory. Within the spectral range of 4–17 μm, the measured maximum thermal emissivities at different temperatures enhance significantly to about 100%. Especially for the coral-like surface structure, the improved thermal emission behaviors can extend largely over the whole spectrum rather than happening at some distinctive wavelengths. Moreover, the enhancement factor of the thermal emissivity is observed to depend on the wavelength and the idiographic morphology of the microstructures. This phenomenon can be understood well by equivalent recognizing the SPP field coupling assisted transmission of blackbody radiation through the microstructured interfaces, and the finite-difference time-domain simulations elucidate the underlying physical pictures. |
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