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Air-Suspended SU-8 Strip Waveguides With High Refractive Index Contrast
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.ORCID iD: 0000-0002-0728-6684
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.
2016 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 28, no 17, p. 1862-1865Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

Integrated polymer photonics is efficient and cheap solution for many applications, such as optical communications and sensors. Waveguides are basic elements of photonic integrated circuits, and their performance directly influences optical circuit efficiency. However, it is a challenge to develop small footprint polymer waveguides with reasonable losses due to low refractive index comparing to cladding. In this letter, we present free-standing SU-8 waveguides with high refractive index contrast. SiO2 cladding is selectively etched, leaving only air as a cladding material; waveguides are supported by thin pillars. Removal of SiO2 cladding eliminates light leakage to substrate and provides better light confinement. Straight and bending SU-8 waveguides are numerically simulated and experimentally verified lambda = 1550 nm. We also report reduced propagation and bending losses in discussed waveguides.

Place, publisher, year, edition, pages
IEEE , 2016. Vol. 28, no 17, p. 1862-1865
Keywords [en]
Optical polymers, optical strip waveguides
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-190548DOI: 10.1109/LPT.2016.2573960ISI: 000379881800017Scopus ID: 2-s2.0-84978926966OAI: oai:DiVA.org:kth-190548DiVA, id: diva2:952797
Note

QC 20160815

Available from: 2016-08-15 Created: 2016-08-12 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Polymer Components for Photonic Integrated Circuits
Open this publication in new window or tab >>Polymer Components for Photonic Integrated Circuits
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Optical polymers are a subject of research and industry implementation for many decades. Optical polymers are inexpensive, easy to process and flexible enough to meet a broad range of application-specific requirements. These advantages allow a development of cost-efficient polymer photonic integrated circuits for on-chip optical communications. However, low refractive index contrast between core and cladding limits light confinement in a core and, consequently, integrated polymer device miniaturization. Also, polymers lack active functionality like light emission, amplification, modulation, etc. In this work, we improved a performance of integrated polymer waveguides and demonstrated active waveguide devices. Also, we present novel Si QD/polymer optical materials.

In the integrated device part, we demonstrate optical waveguides with enhanced performance. Decreased radiation losses in air-suspended curved waveguides allow low-loss bending with radii of only 15 µm, which is far better than >100 µm for typical polymer waveguides. Another study shows a positive effect of thermal treatment on acrylate waveguides. By heating higher than polymer glass transition temperature, surface roughness is reflown, minimizing scattering losses. This treatment method enhances microring resonator Q factor more than 2 times. We also fabricated and evaluated all-optical intensity modulator based on PMMA waveguides doped with Si QDs.

We developed novel hybrid optical materials. Si QDs are encapsulated into PMMA and OSTE polymers. Obtained materials show stable photoluminescence with high quantum yield. We achieved the highest up to date ~65% QY for solid-state Si QD composites. Demonstrated materials are a step towards Si light sources and active devices.

Integrated devices and materials presented in this work enhance the performance and expand functionality of polymer PICs. The components described here can also serve as building blocks for on-chip sensing applications, microfluidics, etc.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. p. 60
Series
TRITA-FYS, ISSN 0280-316X ; 2017:66
Keywords
integrated photonics, polymers, optical communications, microfabrication, optical waveguides, microring resonators, silicon, Si nanocrystals, photoluminescence
National Category
Engineering and Technology
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-219556 (URN)978-91-7729-576-1 (ISBN)
Public defence
2017-11-24, Sal C, Isafjordsgatan 22, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 20171207

Available from: 2017-12-07 Created: 2017-12-07 Last updated: 2017-12-07Bibliographically approved

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