Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms10103
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Funding
- Basic Science Research Program
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [NRF-2015R1A2A2A11001112, NRF-2013M3C1A3065045]
- Low Observable Technology Research Center Program of the Defense Acquisition Program Administration
- Agency for Defense Development
- Asian Office of Aerospace RD grant [FA2386-15-1-4024 (15IOA024)]
- National Research Foundation of Korea [2013M3C1A3065045] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Solar steam generation has been achieved by surface plasmon heating with metallic nanoshells or nanoparticles, which have inherently narrow absorption bandwidth. For efficient light-to-heat conversion from a wider solar spectrum, we employ adiabatic plasmonic nanofocusing to attain both polarization-independent ultrabroadband light absorption and high plasmon dissipation loss. Here we demonstrate large area, flexible thin-film black gold membranes, which have multiscale structures of varying metallic nanoscale gaps (0-200 nm) as well as microscale funnel structures. The adiabatic nanofocusing of self-aggregated metallic nanowire bundle arrays produces average absorption of 91% at 400-2,500 nm and the microscale funnel structures lead to average reflection of 7% at 2.5-17 mu m. This membrane allows heat localization within the few micrometre-thick layer and continuous water provision through micropores. We efficiently generate water vapour with solar thermal conversion efficiency up to 57% at 20 k Wm(-2). This new structure has a variety of applications in solar energy harvesting, thermoplasmonics and related technologies.
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