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Honeycomb-lattice plasmonic absorbers at NIR: anomalous high-order resonance
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.ORCID iD: 0000-0002-0111-9009
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.ORCID iD: 0000-0002-3368-9786
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.
2013 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, no 18, 20873-20879 p.Article in journal (Refereed) Published
Abstract [en]

We design, fabricate and characterize a plasmonic honeycomb lattice absorber with almost perfect absorption at 1140 nm over a wide incident angle range. This absorber also possesses a narrow-band, angle-and polarization-dependent high-order resonance in the short-wavelength range, with a bandwidth of 19 nm and angle sensitivity of 3 nm per degree. The nature of this high-order absorption band is analyzed through finite-element simulations. We believe it is due to Bragg coupling of the incident light to the backward-propagating surface plasmon polariton through the periodic modulation of the structure. Such fine absorption bands can find applications in plasmonic sensors and spectrally selective thermal emitters.

Place, publisher, year, edition, pages
2013. Vol. 21, no 18, 20873-20879 p.
Keyword [en]
Electromagnetic wave polarization, Honeycomb structures, Surface plasmon resonance
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-132209DOI: 10.1364/OE.21.020873ISI: 000324867100053Scopus ID: 2-s2.0-84884575313OAI: oai:DiVA.org:kth-132209DiVA: diva2:659249
Funder
Swedish Foundation for Strategic Research Swedish Research Council
Note

QC 20131024

Available from: 2013-10-24 Created: 2013-10-24 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Fabrication and Characterization of Plasmonic Nanophotonic Absorbers and Waveguides
Open this publication in new window or tab >>Fabrication and Characterization of Plasmonic Nanophotonic Absorbers and Waveguides
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Plasmonics is a promising field of nanophotonics dealing with light interaction with metallic nanostructures. In such material systems, hybridizationof photons and collective free-electron oscillation can result in sub-wavelength light confinement. The strong light-matter interaction can be harnessed for,among many applications, high-density photonic integration, metamaterial design, enhanced nonlinear optics, sensing etc. In the current thesis work, we focus on experimental fabrication and characterization of planar plasmonic metamaterials and waveguide structures. The samples are fabricated based on the generic electron beam lithography and characterizations are done with our home-made setups. Mastering and refinement of fabrication techniques as well as setting up the characterization tools have constituted as a majorpart of the thesis work. In particular, we experimentally realized a plasmonic absorber based on a 2D honeycomb array of gold nano-disks sitting on top of a reflector through a dielectric spacer. The absorber not only exhibits an absorption peak which is owing to localized surface plasmon resonance and is insensitive to incidence’s angle or polarization, but also possesses an angle- and polarization-sensitive high-order absorption peak with a narrow bandwidth. We also demonstrated that the strong light absorption in such plasmonic absorbers can be utilized to photothermally re-condition the geometry of gold nanoparticles. The nearly perfect absorption capability of our absorbers promises a wide range of potential applications, including thermal emitter, infrared detectors, and sensors etc. We also fabricated a plasmonic strip waveguide in a similar metal-insulator-metal structure. The strip waveguide has a modal confinement slightly exceeding that of the so-called plasmonic slot waveguide. We further thermally annealed the waveguide. It is observed that the propagation loss at 980 nm has been decreased significantly,which can be attributed to the improvement in gold quality after thermal annealing.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. x, 55 p.
Series
TRITA-ICT/MAP AVH, ISSN 1653-7610 ; 2014:02
Keyword
Nanophotonics, plasmonics, fabrication
National Category
Nano Technology
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-140844 (URN)978-91-7501-995-6 (ISBN)
Public defence
2014-02-27, Sal/hall D, Forum, KTH-ICT, Isafjordsgatan 39, Kista, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Foundation for Strategic Research
Note

QC 20140203

Available from: 2014-02-03 Created: 2014-01-31 Last updated: 2014-02-03Bibliographically approved

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Dai, JinYan, Min

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