Bio-inspired plasmonic leaf for enhanced light-matter interactions

Liu, Changxu, Mao, Peng, Guo, Qinghua, Han, Min and Zhang, Shuang (2019) Bio-inspired plasmonic leaf for enhanced light-matter interactions. Nanophotonics, 8 (7). pp. 1291-1298. ISSN 2192-8614

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The mathematical concept of fractals is widely applied to photonics as planar structures ranging from terahertz resonators, optical antennas, to photodetectors. Here, instead of a direct mathematical abstract, we design a plasmonic leaf with fractal geometry from the outline of a leaf from Wargrave Pink. The enhanced light-matter interactions are observed numerically from the improvement in both absorption and near-field intensification. To demonstrate the effect experimentally, a three-dimensional fractal structure is realised through direct laser writing, which significantly improves the photothermal conversion. By virtue of the self-similarity in geometry, the artificial leaf improves the absorption of a 10-nm-thick gold film with 14 ×  temperature increment compared to flat Au film. Not limited to the proof-of-concept photothermal experiment demonstrated here, the fractal structure with improved light-matter interactions can be utilised in a variety of applications ranging from non-linear harmonic generation, plasmonic-enhanced fluorescence, to hot electron generation for photocatalysis.

Item Type: Article
Additional Information: Research funded by H2020 European Research Council (734578 (D-SPA)), National Natural Science Foundation of China (11604161)
Uncontrolled Keywords: plasmonics, photothermal conversion, fractal, bio-inspired
Subjects: F300 Physics
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 13 Sep 2021 14:39
Last Modified: 13 Sep 2021 14:45

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