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Light absorber base...
Light absorber based on nano-spheres on a substrate reflector
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- Dai, Jin (författare)
- KTH,Fotonik och optik
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- Ye, Fei (författare)
- KTH,Funktionella material, FNM
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- Chen, Yiting (författare)
- KTH,Fotonik och optik
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- Muhammed, Mamoun (författare)
- KTH,Funktionella material, FNM
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- Qiu, Min (författare)
- KTH,Fotonik och optik
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- Yan, Min (författare)
- KTH,Fotonik och optik
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(creator_code:org_t)
- 2013
- 2013
- Engelska.
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Ingår i: Optics Express. - 1094-4087. ; 21:6, s. 6697-6706
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We systematically study a type of plasmonic light absorber based on a monolayer of gold nano-spheres with less than 30 nm in diameters deposited on top of a continuous gold substrate. The influences of particle size, inter-particle distance, particle-substrate spacer size etc on the resonance are studied thoroughly with a 3D finite-element method. We identified that the high-absorption resonance is mainly due to gap plasmon (coupled through particle bodies) when the separation between neighboring nano-spheres is small enough, such as close to 1 nm; at larger particle separations, the resonance is dominated by particle dipoles (coupled through the host dielectric). Experimentally, an absorber was fabricated based on chemically-synthesized gold nanoparticles coated with silica shell. The absorber shows a characteristic absorption band around 810 nm with a maximum absorbance of approximately 90%, which agrees reasonably well with our numerical calculation. The fabrication technique can be easily adapted for devising efficient light absorbers of large areas.
Ämnesord
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Nyckelord
- Plasmonic Nanostructures
- Perfect Absorber
- Nanoparticles
- Metamaterials
- Enhancement
- Devices
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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