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High performance optical absorber based on a plasmonic metamaterial
KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik.
KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik.
Visa övriga samt affilieringar
2010 (Engelska)Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 96, nr 25, s. 251104-Artikel i tidskrift (Refereegranskat) 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]

Ort, förlag, år, upplaga, sidor
2010. Vol. 96, nr 25, s. 251104-
Nyckelord [en]
absorption coefficients, metamaterials, nanofabrication, nanoparticles, plasmonics
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:kth:diva-27284DOI: 10.1063/1.3442904ISI: 000279168100004Scopus ID: 2-s2.0-77954042922OAI: oai:DiVA.org:kth-27284DiVA, id: diva2:376996
Anmärkning
QC 20101213Tillgänglig från: 2010-12-13 Skapad: 2010-12-09 Senast uppdaterad: 2017-12-11Bibliografiskt granskad
Ingår i avhandling
1. Fabrication and Characterization of Photonic Crystals, Optical Metamaterials and Plasmonic Devices
Öppna denna publikation i ny flik eller fönster >>Fabrication and Characterization of Photonic Crystals, Optical Metamaterials and Plasmonic Devices
2011 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2011. s. xi, 58
Serie
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2011:09
Nyckelord
Photonic crystals, metamaterials, plasmonics
Nationell ämneskategori
Telekommunikation
Forskningsämne
SRA - Informations- och kommunikationsteknik
Identifikatorer
urn:nbn:se:kth:diva-33600 (URN)978-91-7501-014-4 (ISBN)
Disputation
2011-06-07, sal C1, Electrum, Isafjordsgatan 26, Kista, Stockholm, 14:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20110524Tillgänglig från: 2011-05-24 Skapad: 2011-05-11 Senast uppdaterad: 2011-05-24Bibliografiskt granskad

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