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High-sensitivity liquid refractive-index sensor based on a Mach-Zehnder interferometer with a double-slot hybrid plasmonic waveguide
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.ORCID iD: 0000-0003-3618-6049
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: 0000-0001-5967-2651
2015 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, no 20, 25688-25699 p.Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

A Mach-Zehnder Interferometer (MZI) liquid sensor, employing ultra-compact double-slot hybrid plasmonic (DSHP) waveguide as active sensing arm, is developed. Numerical results show that extremely large optical confinement factor of the tested analytes (as high as 88%) can be obtained by DSHP waveguide with optimized geometrical parameters, which is larger than both, conventional SOI waveguides and plasmonic slot waveguides with same widths. As for MZI sensor with 40 mu m long DSHP active sensing area, the sensitivity can reach as high value as 1061nm/RIU (refractive index unit). The total loss, excluding the coupling loss of the grating coupler, is around 4.5dB.

Place, publisher, year, edition, pages
Optical Society of America, 2015. Vol. 23, no 20, 25688-25699 p.
Keyword [en]
Silicon-On-Insulator, Resonators
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-179177DOI: 10.1364/OE.23.025688ISI: 000365077900026PubMedID: 26480084Scopus ID: 2-s2.0-84943781741OAI: oai:DiVA.org:kth-179177DiVA: diva2:882183
Note

QC 20151214

Available from: 2015-12-14 Created: 2015-12-11 Last updated: 2017-04-27Bibliographically approved
In thesis
1. Hybrid Plasmonic Devices for Optical Communication and Sensing
Open this publication in new window or tab >>Hybrid Plasmonic Devices for Optical Communication and Sensing
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Hybrid plasmonic (HP) waveguides, a multi-layer waveguide structure supporting a hybrid mode of surface plasmonics and Si photonics, is a compromise way to integrate plasmonic materials into Si or SOI platforms, which can guide optical waves of sub-wavelength size, and with relative low propagation loss. In this thesis, several HP waveguides and devices are developed for the purposes of optical communications and sensing. The single-slot HP ring resonator sensor with 2.6µm radius can give a quality factor (factor) of 1300 at the communication wavelength of 1.5µm with a device sensitivity of 102nm/RIU (refractive index unit). The Mach-Zehnder interferometer (MZI) with a 40µm double-slot HP waveguide has a device sensitivity around 474nm/RIU. The partly open silicon side-coupled double-slot HP ring resonator has a device sensitivity of 687.5nm/RIU, with a Q factor over 1000 after optimization. Further, an all-optical switching HP donut resonator with a photothermal plasmonic absorber is developed, utilizing the thermal expansion effect of silicon to shift the resonant peak of the HP resonator. The active area has a radius of 10µm to match the core size of a single-mode fiber. By applying 10mW power of the driving laser to the absorber, the resonator transmitted power can be changed by 15dB, with an average response time of 16µs. Using the same fabrication flow, and removing the oxide materials using hydrogen fluoride wet etching, a hollow HP waveguide is fabricated for liquid sensing applications. The experimentally demonstrated waveguide sensitivity is about 0.68, which is more than twice that of pure Si waveguide device. Microelectromechanical systems (MEMS) can also be integrated into vertical HP waveguides. By tuning the thickness of the air gap, over 20dB transmitted power change was experimentally demonstrated. This can be used for optical switching applications by either changing the absorption or phase of the HP devices.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 74 p.
Series
TRITA-FYS, ISSN 0280-316X ; 2017:24
National Category
Telecommunications Nano Technology
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-205974 (URN)978-91-7729-365-1 (ISBN)
Public defence
2017-05-22, Sal C, Electrum, Kistagången 16, Kista, 10:00 (English)
Opponent
Supervisors
Note

QC 20170427

Available from: 2017-04-27 Created: 2017-04-25 Last updated: 2017-04-28Bibliographically approved

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