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Double-Slot Hybrid Plasmonic Ring Resonator Used for Optical Sensors and Modulators
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Fotonik och mikrovågsteknik, FMI. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. (Laboratory of Photonics and Microwave Engineering)ORCID iD: 0000-0003-3618-6049
KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. Zhejiang-KTH Joint Research Center of Photonics, JORCEP .
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Fotonik och mikrovågsteknik, FMI. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. Hewlett-Packard Laboratories, Palo Alto, CA 94304, USA. (Laboratory of Photonics and Microwave Engineering)
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Fotonik och mikrovågsteknik, FMI. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. JORCEP, Joint Research Center of Photonics of the Royal Institute of Technology (Sweden) and Zhejiang University (China), Hangzhou, 310058, China. (Laboratory of Photonics and Microwave Engineering)ORCID iD: 0000-0001-5967-2651
2015 (English)In: Photonics, E-ISSN 2304-6732, Vol. 2, no 4, 1116-1130 p.Article in journal (Refereed) Published
Abstract [en]

An ultra-high sensitivity double-slot hybrid plasmonic (DSHP) ring resonator, used for optical sensors and modulators, is developed. Due to high index contrast, as well as plasmonic enhancement, a considerable part of the optical energy is concentrated in the narrow slots between Si and plasmonic materials (silver is used in this paper), which leads to high sensitivity to the infiltrating materials. By partial opening of the outer plasmonic circular sheet of the DSHP ring, a conventional side-coupled silicon on insulator (SOI) bus waveguide can be used. Experimental results demonstrate ultra-high sensitivity (687.5 nm/RIU) of the developed DSHP ring resonator, which is about five-times higher than for the conventional Si ring with the same geometry. Further discussions show that a very low detection limit (5.37 × 10−6 RIU) can be achieved after loaded Q factor modifications. In addition, the plasmonic metal structures offer also the way to process optical and electronic signals along the same hybrid plasmonic circuits with small capacitance (~0.275 fF) and large electric field, which leads to possible applications in compact high-efficiency electro-optic modulators, where no extra electrodes for electronic signals are required

Place, publisher, year, edition, pages
Basel, Switzerland: MDPI AG , 2015. Vol. 2, no 4, 1116-1130 p.
Keyword [en]
integrated optics, waveguides, plasmonic
National Category
Engineering and Technology
Research subject
Information and Communication Technology
Identifiers
URN: urn:nbn:se:kth:diva-198460DOI: 10.3390/photonics2041116OAI: oai:DiVA.org:kth-198460DiVA: diva2:1056456
Funder
Swedish Research Council
Note

QC 20161215

Available from: 2016-12-14 Created: 2016-12-14 Last updated: 2017-05-23Bibliographically 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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