A5103184308- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Superconducting and THz Device Technology
- Terahertz technology and applications
- Optical Network Technologies
- Photonic Crystals and Applications
- Spectroscopy and Laser Applications
- Thermal Radiation and Cooling Technologies
- Optical Coatings and Gratings
- Phase-change materials and chalcogenides
- Color perception and design
- Molecular Junctions and Nanostructures
- Thin-Film Transistor Technologies
- Surface and Thin Film Phenomena
- Infrared Target Detection Methodologies
- Advanced Thermodynamic Systems and Engines
- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
- Chemical and Physical Properties of Materials
Karlsruhe Institute of Technology
2018-2025
University of Maryland, College Park
1954-1958
Abstract Combining semiconductor optical amplifiers (SOA) on direct-bandgap III–V substrates with low-loss silicon or silicon-nitride photonic integrated circuits (PIC) has been key to chip-scale external-cavity lasers (ECL) that offer wideband tunability along small linewidths. However, fabrication of such devices still relies technologically demanding monolithic integration heterogeneous material systems requires costly high-precision package-level assembly, often based active alignment,...
We formulate and experimentally validate an equivalent-circuit model based on distributed elements to describe the electric electro-optic (EO) properties of travelling-wave silicon-organic hybrid (SOH) slot-waveguide modulators. The allows reliably predict small-signal EO frequency response modulators exploiting purely electrical measurements frequency-dependent RF transmission characteristics. verify validity our model, we design guidelines for optimum trade-off between optical loss due...
We demonstrate an optical phased-array equipped with a 3D-printed facet-attached element for shaping and deflection of the emitted beam. The beam shaper combines freeform refractive surfaces total-internal-reflection mirrors is in-situ printed to edge-emitting waveguide facets using high-resolution multi-photon lithography, thereby ensuring precise alignment respect on-chip structures. In proof-of-concept experiment, we achieve grating-lobe free steering range <mml:math...
Different terrestrial terahertz applications would benefit from large-format arrays, operating in compact and inexpensive cryocoolers at liquid helium temperature with sensitivity, limited only by the 300-K background radiation. A voltage-biased transition-edge sensor (TES) as a THz detector can have sufficient sensitivity has number of advantages important for real applications: linearity response, high dynamic range, simple calibration. However, it requires low-noise current readout....
Nonlinear losses of integrated waveguides are crucial for many applications. We develop and experimentally verify a quantitative model two-photon absorption (TPA), subsequent free-carrier (FCA), damage thresholds silicon photonic under pulsed continuous-wave (CW) operation.
Silicon-organic hybrid (SOH) integration can complement intrinsically scalable silicon photonic circuits by novel functionalities, obtained through theory-guided material engineering. This presentation will give an overview of our recent progress in exploring the potential SOH platform and bringing technology from laboratory demonstrations to industrial applications. Full-text article not available; see video
We demonstrate an optical phased-array (OPA) equipped with a 3D-printed facet-attached element for shaping and deflection of the emitted beam. The beam shaper combines freeform refractive surfaces total-internal-reflection (TIR) mirrors is in-situ printed to edge-emitting waveguide facets using high-resolution multi-photon lithography, thereby ensuring precise alignment respect on-chip structures. In proof-of-concept experiment, we achieve grating-lobe free steering range $\pm 30°$...
We demonstrate solid-state optical phased arrays exploiting 3D-printed facet-attached freeform elements for shaping and deflection of an edge-emitted beam to a surface-normal direction. The concept opens attractive alternative widely used grating structures.
Different terrestrial terahertz applications would benefit from large-format arrays, operating in compact and inexpensive cryocoolers at liquid helium temperature with sensitivity, limited by the 300-K background radiation only. A voltage-biased Transition-Edge Sensor (TES) as a THz detector can have sufficient sensitivity has number of advantages important for real linearity response, high dynamic range simple calibration, however it requires low-noise current readout. Usually, amplifier...