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• W2763458481 abstract "This thesis is a contribution to the hybrid integration of active materials including Erbium-doped and carbon nanotubes rich layers on silicon for on-chip light emission.In a first step, we designed, fabricated, and characterized within the silicon-on-insulator and silicon nitride platforms a range of photonic structures including strip/slot waveguides, micro disks, strip/slot ring resonators, and micro cavities aiming at preparing a set of passive device building blocks needed for hybrid integration on Si. Silicon slot waveguides and slot ring add-drop resonators filled with index liquids with linear propagation losses 2-7 dB/cm and Q-factors up to 30,000, have been demonstrated around wavelength=1.55µm. Propagation loss of silicon nitride slot waveguides were minimized down to ~4dB/cm for compact spiral structures (2cm long, within ~500µm×500µm area). Air-band mode Nano beam cavities were also investigated, leading to Nano cavities with mode volumes V ~0.03(wavelength/n)^3 and Q-factors ~70,000 when filled with soft materials.In a second step, hybrid integration of Erbium doped materials and semiconducting single-wall carbon nanotubes (SWCNTs) was investigated for light emission under optical pumping.Integration of Erbium-doped materials was studied within the framework of two collaborations: Prof. Daming Zhang’s team, in State Key Laboratory on Integrated Optoelectronics, Jilin University, China, and Prof. Zhipei Sun, in Department of Micro- and Nanosciences, Aalto University, Finland. Erbium doped layers coming from Jilin were composed of Er3+ and Yb3+ co-doped core {shell} nanoparticles which were copolymerized with methyl methacrylate (MMA) to synthesize nanocomposite (PMMA-NPs: Er3+/Yb3+). We conducted the experimental characterization that led to the demonstration of an internal net gain up to 10-17dB/cm at wavelength=1.53µm in Erbium doped polymer rib waveguides fabricated in Jilin. The second Erbium doped material available during this thesis was based on Er2O3/Al2O3 atomic layers, grown in Aalto University. This collaboration was devoted to integrate high Erbium ion concentration (10E21/cm3) in oxide cladding layers on top of silicon nitride slot waveguides, which were fabricated in our group for the demonstration of on-chip optical net gain. The carried out experiments have conducted to the demonstration of 1.5-22.8dB/cm gain for sub millimeter length waveguides.In another direction, hybrid integration of SWCNTs emitting at wavelengths around 1.3 µm on ring resonators and Nano beam cavities has been investigated. First, we studied the coupling of SWCNTs photoluminescence (PL) in silicon micro-ring resonators and compared it with the PL intensity coupled into the bus waveguide . It has been shown that the pump beam polarization controls the light coupling into the straight bus waveguide. We demonstrated an enhancement of the PL intensity of 20dB at resonance. We also explored CNT hybrid integration with ultra-small mode volume Nano beam optical cavities, and hence with larger Purcell-like Q/V factors in comparison with the one obtained in micro-ring resonators. The results revealed that the PL resonance enhancement due to Nano beam cavity field confinement exhibited a nonlinear growth as a function of the pump power. It was also shown that the resonance of the PL peak intensity grows faster with the pump power than the PL background, which is accompanied by a line width narrowing of the resonance PL peak. This result is the first step to achieve an integrated laser based on carbon nanotubes." @default.
• W2763458481 created "2017-10-20" @default.
• W2763458481 creator A5080308075 @default.
• W2763458481 date "2017-01-13" @default.
• W2763458481 modified "2023-09-23" @default.
• W2763458481 title "Hybrid Integration of Er-doped Materials and CNTs on Silicon for Light Emission and Amplification" @default.
• W2763458481 hasPublicationYear "2017" @default.
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