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.
Light particles in a pin-ball machine
Dutch national quality newspaper "NRC" published a one-page article in the science section on our recent article in Phys. Rev. A on "Programmable two-photon quantum interference in 10^3 channels in opaque scattering media".May 12, 2016
Quantum physics inside a drop of paint
Inside a drop of paint, light is scattered so often that it seems impossible to demonstrate quantum effects. But despite the thousands of possible paths the light can take, like a drunk person inside a labyrinth, researchers of the University of Twente now show that there are just two exits. Depending on the light pattern that enters the paint, two photons always come out through the same exit, or through different ones – as though they avoid each other. The scientists of UT’s MESA+ Institute for Nanotechnology publish about these remarkable findings in the Physical Review A journal.October 29, 2015
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 (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.