Jens Richter

Jens Richter
RWTH Aachen University · Integrated Photonics Laboratory

Doctor of Engineering

About

9
Publications
3,318
Reads
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85
Citations
Citations since 2016
7 Research Items
71 Citations
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2016201720182019202020212022051015

Publications

Publications (9)
Conference Paper
A hybrid diamond/silicon air-clad ridge waveguide platform is demonstrated. The air-clad structure coupled with the wide transmission window of diamond can allow for the use of this architecture over a large wavelength range, especially for the longer infrared wavelengths. In order to provide vertical confinement, the silicon substrate was isotropi...
Thesis
Full-text available
Microresonators shaped by surface tension minimization of a melted silica film (microtoroids) are known for their extraordinarily high-quality factors on the order of a 100 million [1] and above, which enable the generation of frequency combs via nonlinear effects with very low optical power-thresholds [2]. In the field of integrated silicon photon...
Article
Full-text available
We report on the monolithic integration of a new class of reflown silica microtoroid resonators with silicon nanowaveguides fabricated on top of the silica film. Connectivity with other silicon photonics devices is enabled by inversion of the toroid geometry, defined by etching a circular opening rather than a disk in an undercut silica membrane. I...
Article
Full-text available
A hybrid group IV ridge waveguide platform is demonstrated, with potential application across the optical spectrum from ultraviolet to the far infrared wavelengths. The waveguides are fabricated by partial etching of sub-micron ridges in a nanocrystalline diamond thin film grown on top of a silicon wafer. To create vertical confinement, the diamond...
Article
Full-text available
We demonstrate that nanocrystalline diamond films grown on highly doped silicon substrates can be patterned using a CO2 laser operating at a wavelength of 10.6 μm, where both low doped silicon and diamond exhibit negligible optical absorption. The patterning is initiated by free carrier absorption in the silicon substrate and further enhanced by th...
Article
We investigate the effect of tunable optical feedback on a commercial DFB laser edge coupled to a Silicon Photonics planar integrated circuit in which a tunable reflector has been implemented by means of a ring resonator based add-drop multiplexer. Controlled optical feedback allows for fine-tuning of the laser oscillation frequency. Under certain...
Article
Full-text available
We report on the design and fabrication of a new type of microtoroid high-Q silica resonators monolithically coupled to on-chip silicon nanowire waveguides. In order to enable monolithic waveguide coupling, the microtoroid geometry is inverted such that the resonator is formed by thermal reflow at the circumference of a hole etched in a suspended S...
Article
We use low-cost colloidal lithography with micrometer-sized polystyrene spheres to fabricate arrays of triangular gold microstructures on different infrared-transparent substrates while varying the structures’ lateral size. The refractive index n of the substrate in the infrared spectral range can be varied strongly, e.g., from n = 1.4 (calcium flu...

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Projects

Projects (2)
Project
Finding applications, collaborators and processes for making use of medium power (CW @ 0-20 Watts optical output power) CO2-Reflow-Setup. The Setup includes micrometer positioning of a desired sample, controllable focusing optics of CO2-Beam and live capture of the process via an dedicated imaging camera-system.
Project
Fabrication of fully integrated High-Q on-chip silica toroids (coupled via silicon nanowire waveguides) with a intrinsic Q higher than 10^8 to be used in a silicon photonics technology platform.