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Absorption Enhancem...
Absorption Enhancement in Lossy Transition Metal Elements of Plasmonic Nanosandwiches
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- Antosiewicz, Tomasz, 1981 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Apell, Peter, 1952 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Wadell, Carl, 1985 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Langhammer, Christoph, 1978 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2012-09-17
- 2012
- Engelska.
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Ingår i: Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 116:38, s. 20522-20529
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Abstract
Ämnesord
Stäng
- Combination of catalytically active transition metals and surface plasmons offers a promising way to drive chemical reactions by converting incident visible light into energetic electron-hole pairs acting as a mediator. In such a reaction enhancement scheme, the conversion efficiency is dependent on light absorption in the metal. Hence, increasing absorption in the plasmonic structure is expected to increase generation of electron-hole pairs and, consequently, the reaction rate. Furthermore, the abundance of energetic electrons might facilitate new reaction pathways. In this work we discuss optical properties of homo- and heterometallic plasmonic nanosandwiches consisting of two parallel disks made of gold and palladium. We show how near-field coupling between the sandwich elements can be used to enhance absorption in one of them. The limits of this enhancement are investigated using finite-difference time-domain simulations. Physical insight is gained through a simple coupled dipole analysis of the nanostructure. For small palladium disks (compared to the gold disk), total absorption enhancement integrated over the near visible solar AM 1.5 spectrum is 8-fold, while for large palladium disks, similar in size to the gold one, it exceeds three.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies (hsv//eng)
Nyckelord
- single
- surface
- discrete-dipole approximation
- silver nanoparticles
- nanostructures
- optical-constants
- resonance
- particles
- real-time
- perfect absorber
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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