Integrated Nonlinear Optics in Silicon Nitride Waveguides
Doctoral thesis, 2017

Current nanofabrication techniques allow patterning of optical waveguides with submicron cores. This results in strong confinement of light, which leads to high optical intensities. If the waveguides are fabricated with materials that display a large nonlinear Kerr coefficient, then nonlinear optical phenomena can take place in a very efficient manner. Silicon nitride is a very well-studied material in the electronics industry. The material has a large transparency window, from the ultraviolet to the short-wave infrared, and its fabrication is completely compatible with standard techniques formerly developed by the semiconductor industry. Silicon nitride strip waveguides can also confine light, and diverse applications based on nonlinear optics have been demonstrated before. However, these applications required core thickness above 300 nm and they are very challenging to fabricate in a reliable manner with standard deposition techniques. In this thesis, we have studied unconventional silicon nitride waveguides that are more robust for fabrication. The first layout corresponds to a thin strip waveguide with low optical confinement and propagation losses of only 6 dB/m. This technology was originally developed at the University of California, Santa Barbara. We used the technology to demonstrate wavelength conversion of high-speed data. In this thesis, we developed another silicon nitride technology that allowed for high light confinement. We discovered that by modifying the stoichiometry of the film during the deposition process, one could drastically change the optical and mechanical properties of the material. With this technology we demonstrated octave-spanning supercontinuum generation in collaboration with the Technical University of Denmark and XPM-based all-optical processing in collaboration with McGill University. These results indicate that this platform is very suitable for nonlinear integrated optics. The long-term goal of our research is being able to attain an optical parametric amplifier on chip using a continuous-wave pump laser source. In this thesis we benchmarked the losses of high-confinement waveguides for the realization of 10 dB parametric net-gain on chip and identified silicon nitride as the most plausible technology to achieve this goal in the near future.

integrated optics devices

nonlinear optics materials

four-wave mixing

nonlinear optical signal processing

wavelength conversion devices

nanostructure fabrication

A423 (Kollektorn) - MC2 - Kemivägen 9
Opponent: Dr. Kartik A. Srinivasan, National Institute of Standards and Technology, USA


Clemens Krückel

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Continuous wave-pumped wavelength conversion in low-loss silicon nitride waveguides

Optics Letters,; Vol. 40(2015)p. 875-878

Journal article

Cross-Phase-Modulation-Based Wavelength Conversion in Low-Stress Silicon-Rich Nitride Waveguide

2016 Optical Fiber Communications Conference and Exhibition (Ofc),; (2016)

Paper in proceeding

Octave-spanning supercontinuum generation in a silicon-rich nitride waveguide

Optics Letters,; Vol. 41(2016)p. 2719-2722

Journal article

All-Optical Radio Frequency Spectrum Analyzer Based on Cross-Phase Modulation in a Silicon-Rich Nitride Waveguide

2016 International Topical Meeting on Microwave Photonics (MWP),; (2016)p. 313-316

Paper in proceeding

Areas of Advance

Information and Communication Technology

Nanoscience and Nanotechnology (SO 2010-2017, EI 2018-)

Materials Science


Nanofabrication Laboratory

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering



Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 4235



A423 (Kollektorn) - MC2 - Kemivägen 9

Opponent: Dr. Kartik A. Srinivasan, National Institute of Standards and Technology, USA

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