Journal
OPTICS EXPRESS
Volume 25, Issue 13, Pages 14114-14124Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.014114
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Funding
- National Natural Science Foundation of China [61307078, 91233208]
- Program of Zhejiang Leading Team of Science and Technology Innovation [2010R50007]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130101120134]
- Fundamental Research Funds for the Central Universities [2017FZA5001]
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A facile polymethyl methacrylate-assisted turnover-transfer approach is developed to fabricate uniform hexagonal gold nanobowl arrays. The bare array shows inferior light trapping ability compared to its inverted counterpart (a gold nanospherical shell array). Surprisingly, after being coated with a 60-nm thick amorphous silicon film, an anomalous light trapping enhancement is observed with a significantly enhanced average absorption (82%), while for the inverted nanostructure, the light trapping becomes greatly weakened with an average absorption of only 66%. Systematic experimental and theoretical results show that the main reason for the opposite light trapping behaviors lies in the top amorphous silicon coating, which plays an important role in mediating the excitation of surface plasmon polaritons and the electric field distributions in both nanostructures. (C) 2017 Optical Society of America
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