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High performance optical absorber based on a plasmonic metamaterial
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
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2010 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 96, no 25, 251104- p.Article in journal (Refereed) Published
Abstract [en]

High absorption efficiency is particularly desirable at present for various microtechnological applications including microbolometers, photodectors, coherent thermal emitters, and solar cells. Here we report the design, characterization, and experimental demonstration of an ultrathin, wide-angle, subwavelength high performance metamaterial absorber for optical frequencies. Experimental results show that an absorption peak of 88% is achieved at the wavelength of similar to 1.58 mu m, though theoretical results give near perfect absorption. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3442904]

Place, publisher, year, edition, pages
2010. Vol. 96, no 25, 251104- p.
Keyword [en]
absorption coefficients, metamaterials, nanofabrication, nanoparticles, plasmonics
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-27284DOI: 10.1063/1.3442904ISI: 000279168100004ScopusID: 2-s2.0-77954042922OAI: diva2:376996
QC 20101213Available from: 2010-12-13 Created: 2010-12-09 Last updated: 2011-05-24Bibliographically approved
In thesis
1. Fabrication and Characterization of Photonic Crystals, Optical Metamaterials and Plasmonic Devices
Open this publication in new window or tab >>Fabrication and Characterization of Photonic Crystals, Optical Metamaterials and Plasmonic Devices
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

 Nanophotonics is an emerging research field that deals with interaction between light and matter in a sub-micron length scale. Nanophotonic devices have found an increasing number of applications in many areas including optical communication, microscopy, sensing, and solar energy harvesting especially during the past two decades. Among all nanophotonic devices, three main areas, namely photonic crystals, optical metamaterials and plasmonic devices, gain dominant interest in the photonic society owning to their potential impacts. This thesis studies the fabrication and characterization of three types of novel devices within the above-mentioned areas. They are respectively photonic-crystal (PhC) surface-mode microcavities, optical metamaterial absorbers, and plasmonic couplers.

The devices are fabricated with modern lithography-based techniques in a clean room environment. This thesis particularly describes the critical electron-beam lithography step in detail; the relevant obstacles and corresponding solutions are addressed. Device characterizations mainly rely on two techniques: a vertical fiber coupling system and a home-made optical transmissivity/reflectivity setup. The vertical fiber coupling system is used for characterizing on-chip devices intended for photonic integrations, such as PhC surface-mode cavities and plasmonic couplers. The transmissivity/reflectivity setup is used for measuring the absorbance of metamaterial absorbers.

This thesis presents mainly three nanophotonic devices, from fabrication to characterization. First, a PhC surface-mode cavity on a SOI structure is demonstrated. Through a side-coupling scheme, a system quality-factor of 6200 and an intrinsic quality-factor of 13400 are achieved. Such a cavity can be used as ultra-compact optical filter, bio-sensor and etc. Second, an ultra-thin, wide-angle metamaterial absorber at optical frequencies is realized. Experimental results show a maximum absorption peak of 88% at the wavelength of ~1.58μm. The ultra-fast photothermal effect possessed by such noble-metal-based nanostructure can potentially be exploited for making better solar cells. Finally, we fabricated an efficient coupler that channels light from a conventional dielectric waveguide to a subwavelength plasmonic waveguides and vice versa. Such couplers can combine low-loss dielectric waveguides and lossy plasmonic components onto one single chip, making best use of the two.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. xi, 58 p.
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2011:09
Photonic crystals, metamaterials, plasmonics
National Category
Research subject
urn:nbn:se:kth:diva-33600 (URN)978-91-7501-014-4 (ISBN)
Public defence
2011-06-07, sal C1, Electrum, Isafjordsgatan 26, Kista, Stockholm, 14:00 (English)
QC 20110524Available from: 2011-05-24 Created: 2011-05-11 Last updated: 2011-05-24Bibliographically approved

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