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Metal-insulator-metal plasmonic absorbers : influence of lattice
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- Chen, Yiting (author)
- KTH,Optik och Fotonik, OFO
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- Dai, Jin (author)
- KTH,Optik och Fotonik, OFO
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- Yan, Min (author)
- KTH,Optik och Fotonik, OFO
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- 2014
- 2014
- English.
- In: Optics Express. - 1094-4087. ; 22:25, s. 30807-30814
- Journal article (peer-reviewed)
Abstract
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- We experimentally demonstrate three kinds of metal-insulator-metal based plasmonic absorbers consisting of arrays of gold nanodisks distributed in different lattices, including square, triangular and honeycomb lattices. It's found that resonances originated from localized surface plasmon undergo little changes with respect to different lattice distributions of the nanodisks. The interparticle coupling results in a minor bandwidth broadening of the fundamental mode. Different from square-and triangular-lattice absorbers, honeycomb-lattice absorber possesses a unique red-shifting (with respect to incident angles) narrow-band high-order mode, which originates from coupling of incident light to propagating surface plasmon polariton (SPP) waves. Similar high-order mode can also be generated in square-lattice absorber by increasing the period so that a smaller reciprocal lattice vector can be introduced to excite the SPP mode. Furthermore, we show that two types of resonances can interact and create Fano-type resonances. The simulation results agree well with the experimental results. (C) 2014 Optical Society of America
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
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- art (subject category)
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