The Laser Physics and Nonlinear Optics group (LPNO) explores the physics and technology of nonlinear optical processes with emphasis on nanophotonics. This includes a wide range of light intensities and time scales, research on novel or improved light sources, and it includes the selection and control of suitable nonlinear media and advanced optical components. The research currently covers three main themes: Integrated photonics, Photonics with free electrons, and Spectroscopic applications. The group participates in strategic alliances with various partners, including the Applied Nanophotonics Research Orientation of MESA+ Institute for Nanotechnology.
First programmable photonic processing module (Optica, 2, 10, 854-859 (2015))
Integrated microwave photonics, an emerging technology combining radio frequency (RF) engineering and integrated photonics, has great potential to be adopted for wideband analog processing applications. We use a grid of tunable Mach–Zehnder couplers interconnected in a two-dimensional mesh network, to demonstrate for the first time a programmable photonic processing unit with a free spectral range of 14 GHz to enable RF filters featuring continuous and variable passband shaping ranging from a 55 dB extinction notch filter to a 1.6 GHz bandwidth flat-top filter.
|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 (2013))
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.