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High-Q photonic crystal surface-mode cavities on crystalline SOI structures
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Quantum Electronics and Quantum Optics, QEO.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
2010 (English)In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 283, no 11, 2461-2464 p.Article in journal (Refereed) Published
Abstract [en]

High-Q side-coupled surface-mode cavities in two-dimensional (2D) photonic crystals on crystalline silicon-on-insulator (SOI) structures are demonstrated. One of the surface-mode cavities has the measured system Q factor and intrinsic Q factor of 6200 and 13,400, respectively. The experimental results show that the value of system Q factor is ten times and the intrinsic Q factor six times higher than those of similar structures on amorphous SOI structures, respectively, due to the intrinsic material loss is much lower for crystalline silicon. The Q factors of cavities can be further improved by spin-on-glass overlayers, for increasing the structural symmetry. After the spin-on-glass process, the system Q factor and the intrinsic Q factor become nearly twice higher. Meanwhile, the drop wavelengths are largely red-shifted. (C) 2010 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2010. Vol. 283, no 11, 2461-2464 p.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-27850DOI: 10.1016/j.optcom.2010.02.011ISI: 000277824200029Scopus ID: 2-s2.0-77950295905OAI: oai:DiVA.org:kth-27850DiVA: diva2:386624
Funder
Swedish Research Council
Note
QC 20110113Available from: 2011-01-13 Created: 2011-01-03 Last updated: 2017-12-11Bibliographically 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.
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2011:09
Keyword
Photonic crystals, metamaterials, plasmonics
National Category
Telecommunications
Research subject
SRA - ICT
Identifiers
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)
Opponent
Supervisors
Note
QC 20110524Available from: 2011-05-24 Created: 2011-05-11 Last updated: 2011-05-24Bibliographically approved

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