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Photostable Polymer/Si Nanocrystal Bulk Hybrids with Tunable Photoluminescence
KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.ORCID-id: 0000-0002-0728-6684
KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Materialfysik, MF.ORCID-id: 0000-0002-5260-5322
Visa övriga samt affilieringar
2016 (Engelska)Ingår i: ACS Photonics, E-ISSN 2330-4022, Vol. 3, nr 9, s. 1575-1580Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS), 2016. Vol. 3, nr 9, s. 1575-1580
Nyckelord [en]
silicon nanocrystals, photoluminescence, polymers, poly(methyl methacrylate), nanocomposites
Nationell ämneskategori
Fysik
Identifikatorer
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
Anmärkning

QC 20161025

Tillgänglig från: 2016-10-25 Skapad: 2016-10-21 Senast uppdaterad: 2018-06-14Bibliografiskt granskad
Ingår i avhandling
1. Polymer Components for Photonic Integrated Circuits
Öppna denna publikation i ny flik eller fönster >>Polymer Components for Photonic Integrated Circuits
2017 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2017. s. 60
Serie
TRITA-FYS, ISSN 0280-316X ; 2017:66
Nyckelord
integrated photonics, polymers, optical communications, microfabrication, optical waveguides, microring resonators, silicon, Si nanocrystals, photoluminescence
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
Fysik
Identifikatorer
urn:nbn:se:kth:diva-219556 (URN)978-91-7729-576-1 (ISBN)
Disputation
2017-11-24, Sal C, Isafjordsgatan 22, Stockholm, 14:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20171207

Tillgänglig från: 2017-12-07 Skapad: 2017-12-07 Senast uppdaterad: 2017-12-07Bibliografiskt granskad

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Sychugov, Ilya

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Av författaren/redaktören
Marinins, AleksandrsLinnros, JanPopov, SergeiSychugov, Ilya
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Optik och Fotonik, OFOMaterialfysik, MF
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ACS Photonics
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