The Laser Physics and Nonlinear Optics group (LPNO) explores the physics and technology of lasers, nonlinear optical processes and processing of optical information. Emphasis is put on nanophotonic approaches, to control the generation of light to its extremes and to explore novel ways for linear and nonlinear optical processing.
We use low-loss advanced integrated photonic structures as platforms to explore enhanced nonlinear and optomechanical interactions of light with matter, with applications in sensing, precision metrology, on-chip signal processing, optical communications, and nano-resolution imaging. The group collaborates with industrial and other academic partners and participates in various strategic alliances, specifically, the Applied Nanophotonics (ANP) research cluster of the department of Science and Technology, and the MESA+ Institute for Nanotechnology.
Supercontinuum generation in media with sign-alternated dispersion
|When an ultrafast optical pulse with high intensity propagates through transparent material a supercontinuum can be coherently generated by self‐phase modulation. However, the presence of dispersion causes stagnation of spectral broadening past a certain propagation length, requiring an increased input peak power for further broadening. Overcoming such spectral stagnation will be key to achieve practical integrated supercontinuum devices. Researchers of LPNO, together with colleagues from Optische Technologien at the University of Münster have developed a concept for improved supercontinuum generation by counteracting spectral stagnation via repeatedly alternating the sign of group velocity dispersion along the propagation. The effect is experimentally demonstrated using a dispersion alternating fiber and results are in excellent agreement with modeling, revealing almost an order of magnitude reduced peak power. Calculations show similar advantages using integrated optical waveguides resulting in a wide and flat spectrum, which is important for on‐chip broadband photonics (see also UT press release). Full article is available at Lasers & Photonics Review|
June 10, 2020
Work of LPNO and colleagues on cover page of Photonics Journal
|Hybrid integrated diode laser are introducing a new paradigm to photonics, via providing unprecedented coherence, full spectral control, and seamless embedding in high-functionality photonic circuits. Most promising is hybrid integration with ultra-low loss dielectric feedback circuits as these render the widest spectral coverage including the visible range. We present work on various types and operational modes of hybrid-integrated diode lasers based on low-loss dielectric feedback circuits using silicon nitride waveguides. Highlights are the demonstration of sub-100-Hz intrinsic linewidth, up to 120 nm wide spectral coverage around a 1.55 µm wavelength, and more than 100 mW output power. Functionalities include dual-wavelength generation, dual-gain operation, laser frequency comb generation, and wavelength tunable feedback circuits for hybrid lasers in the visible. Full article is available at Photonics, 7, 4 (2020)|
January 22, 2019
Integrated microwave photonics
|Photonics and radio signals join forces for high-speed mobile data communication, like in 5G communications. At the same time, the applications of ‘integrated microwave photonics’ go way beyond telecom. This progress often comes from directions you would not expect in the first place. In a review paper in Nature Photonics), David Marpaung gives together with experts Jianping Yao of the University of Ottawa and Jose Campany of the University of Valencia a vision on the next phase of photonic chips, for example in brain-inspired, ‘neuromorphic’ optical computing. (see also UT Press release).|
VIDI Grant for David Marpaung
David Marpaung (Nanophotonics), currently at the University of Sydney (http://sydney.edu.au/science/people/david.marpaung.php), has received a prestigious grant of the Netherlands Science Organisation (NWO, VIDI). His research is to be hosted in the Laser Physics and Nonlinear Optics group (LPNO) and the Applied Nanophotonic research cluster of the UT (ANP). His activities are supported by various Dutch companies that are working in the field of integrated photonics, for instance Lionix International, Smart Photonics BV and Phoenix BV.
Dr. Marpaung will investigate new technologies for integrated photonic systems, for processing information through interactions between light and 'hypersound', to realize, e.g., on-chip Brillouin processors for future wireless and optical networks.
For more information, check NWO's press release.
|Reconfigurable entanglement circuit (Optica 2, 724 (2015))
Useful time-bin entanglement systems must be able to generate, manipulate, and analyze en- tangled photons on a photonic chip for stable, scalable, and reconfigurable operation. We realiszed the first time-bin entanglement photonic chip that integrates pump time-bin preparation, wavelength demultiplexing, and entanglement analysis. A two-photon interference fringe with 88.4 % visibility is measured (without subtracting any noise), indicating the high performance of the chip. Our approach, based on a silicon nitride photonic circuit, which combines low loss and tight in- tegration features, paves the way for scalable real-world quan- tum information processors.
|Widest on-chip supercontinuum (Optics express, 23, 19596 (2015))
We have generated ultra-broadband supercontinuum generation in high-confinement Si3N4 integrated optical waveguides. The spectrum extends through the visible (from 470 nm) to the infrared spectral range (2130 nm) comprising a spectral bandwidth wider than 495 THz, which is the widest supercontinuum spectrum generated on a chip.
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