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All-Optical Switching Using a Hybrid Plasmonic Donut Resonator With Photothermal Absorber
KTH, School of Information and Communication Technology (ICT).ORCID iD: 0000-0003-3618-6049
KTH, School of Computer Science and Communication (CSC), Computer Vision and Active Perception, CVAP.
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.
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2016 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 28, no 15, 1609-1612 p.Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

A novel hybrid plasmonic (HP) donut resonator integrated with a photothermal plasmonic absorber has been developed, which can be used as a compact all-optical switch or modulator. The radius of the fabricated HP donut resonator is 1.8 mu m, with a resonant wavelength around 1550 nm and a quality factor (Q factor) around 600. The photothermal plasmonic absorber is directly integrated above the HP device, which can absorb as much as 75% of impinging optical power at 1064 nm wavelength. Since the absorber is in tight contact to the Si ridge of the HP waveguide, the absorbed optical power can efficiently heat up the Si ridge, and hence change the resonant wavelength of the HP donut resonator by Si thermal expansion effect. Experimental results show that the power used for 15 dB amplitude switch is only 10 mW, with rise and fall response times around 18 and 14 mu s, respectively.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2016. Vol. 28, no 15, 1609-1612 p.
Keyword [en]
Integrated optics, plasmons, optical resonators
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-190645DOI: 10.1109/LPT.2016.2558478ISI: 000379753400002Scopus ID: 2-s2.0-84973862284OAI: oai:DiVA.org:kth-190645DiVA: diva2:953574
Note

QC 20160818

Available from: 2016-08-18 Created: 2016-08-12 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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