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Publisher DOI: 10.1038/srep44139
Title: Electrochemical tuning of the optical properties of nanoporous gold
Language: English
Authors: Jalas, Dirk 
Shao, Li-Hua 
Canchi, Rashmi 
Okuma, Toshiya 
Lang, Slawa 
Petrov, Alexander  
Weissmüller, Jörg 
Eich, Manfred 
Keywords: Metamaterials; Nanophotonics and plasmonics
Issue Date: 9-Mar-2017
Source: Scientific Reports 7, Article number: 44139 (2017)
Abstract (english): 
Using optical in-situ measurements in an electrochemical environment, we study the electrochemical tuning of the transmission spectrum of films from the nanoporous gold (NPG) based optical metamaterial, including the effect of the ligament size. The long wavelength part of the transmission spectrum around 800 nm can be reversibly tuned via the applied electrode potential. The NPG behaves as diluted metal with its transition from dielectric to metallic response shifted to longer wavelengths. We find that the applied potential alters the charge carrier density to a comparable extent as in experiments on gold nanoparticles. However, compared to nanoparticles, a NPG optical metamaterial, due to its connected structure, shows a much stronger and more broadband change in optical transmission for the same change in charge carrier density. We were able to tune the transmission through an only 200 nm thin sample by 30%. In combination with an electrolyte the tunable NPG based optical metamaterial, which employs a very large surface-to-volume ratio is expected to play an important role in sensor applications, for photoelectrochemical water splitting into hydrogen and oxygen and for solar water purification.
DOI: 10.15480/882.1400
ISSN: 2045-2322
Journal: Scientific reports 
Institute: Optische und Elektronische Materialien E-12 
Werkstoffphysik und -technologie M-22 
Document Type: Article
Project: Open Access Publizieren 2016 - 2017 / Technische Universität Hamburg-Harburg 
SFB 986: Teilprojekt B2 - Feste und leichte Hybridwerkstoffe auf Basis nanoporöser Metalle 
SFB 986, Teilproject C1 - Strukturierte Emitter für effiziente und effektive Thermophotovoltaik 
Optical properties of nanoporous gold 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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