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Anomalous light trapping enhancement in a two-dimensional gold nanobowl array with an amorphous silicon coating
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2017 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, no 13, 14114-14124 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Optical Society of America, 2017. Vol. 25, no 13, 14114-14124 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-211008DOI: 10.1364/OE.25.014115ISI: 000404189800016Scopus ID: 2-s2.0-85021327644OAI: oai:DiVA.org:kth-211008DiVA: diva2:1124450
Note

QC 20170713

Available from: 2017-07-13 Created: 2017-07-13 Last updated: 2017-07-13Bibliographically approved

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He, Sailing
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School of Electrical Engineering (EES)Zhejiang-KTH Joint Research Center of Photonics, JORCEP
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Electrical Engineering, Electronic Engineering, Information Engineering

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