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Photostable Polymer/Si Nanocrystal Bulk Hybrids with Tunable Photoluminescence
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, Material Physics, MF.ORCID iD: 0000-0002-5260-5322
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2016 (English)In: ACS Photonics, E-ISSN 2330-4022, Vol. 3, no 9, p. 1575-1580Article in journal (Refereed) Published
Abstract [en]

Solid polymer/Si nanocrystal bulk nanocomposites were fabricated from solutions of alkene- and hydride-terminated silicon nanocrystals (NCs) in toluene. The photoluminescence peak position of hydride-terminated SiNCs before polymerization was tuned by photoassisted hydrofluoric acid etching. Optical properties of obtained PMMA/NC hybrids, such as quantum yield, luminescence lifetime, and dispersion factor, were evaluated over time. Photostability of these transparent bulk polymer/SiNC hybrids over months was confirmed. The emission covers the visible to near-infrared range with a quantum yield of similar to 30-40% for yellow-red nanocomposites.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2016. Vol. 3, no 9, p. 1575-1580
Keywords [en]
silicon nanocrystals, photoluminescence, polymers, poly(methyl methacrylate), nanocomposites
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-194275DOI: 10.1021/acsphotonics.6b00485ISI: 000384040900009Scopus ID: 2-s2.0-84988647909OAI: oai:DiVA.org:kth-194275DiVA, id: diva2:1039905
Note

QC 20161025

Available from: 2016-10-25 Created: 2016-10-21 Last updated: 2018-06-14Bibliographically 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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Sychugov, Ilya

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