Mathias Beck

2D patch antenna array on a double metal quantum cascade laser with >90% coupling to a Gaussian beam and selectable facet transparency at 1.9 THz.

2×2 parallel fed and 3×3 serial fed patch antenna arrays on a benzocyclobutene (BCB) polymer layer are integrated with a 70 μm wide, dry etched, double metal waveguide quantum cascade laser, operating at about 1.9 THz. The BCB surrounds the quantum cascade laser ridge and is planarized to fit precisely its height. The patch antenna arrays emit a linearly polarized, highly symmetric beam perpendicular to the antenna plane. The beams have a FWHM angle of 49° (2×2) and 35° (3×3). Both measurements and simulations indicate coupling factors to a Gaussian beam of over 90%. The antenna design is strongly governed by the high thickness (h=13.6  μm) and the low dielectric constant (ϵr=2.45) of the BCB substrate. Because the patch array has a very low input reflectivity of -13 to -20  dB over the 1.7-2.1 THz operation band, the laser needs a partially transmitting reflector to maintain the Q-factor of the active medium resonator to assure lasing in the antennas operation band. By changing the dimensions of the reflector, the facet transparency can be designed in a wide range from fully transmissive to highly reflective.

How Managers Can Deal with Complex Issues: A Semi-Quantitative Analysis Method of Causal Loop Diagrams Based on Matrices

The increasing complexity of the modern world creates both higher risks and new interdependencies in the socioeconomic environment. To cope with these challenges powerful new tools must be applied to find sustainable solutions. System dynamics is a field that offers potential assistance in dealing with complex issues. However, managers and politicians often lack the knowledge and necessary skills to apply quantitative methods in their decision-making process. In contrast, qualitative approaches are easily understood and handled but have limited capacities for analysis. To address this gap, we have developed a bundle of tools tailored for managers and politicians facing complex problems. These tools enable executives to recognize effective levers and assess potential consequences of specific interventions in a highly interconnected system. The approach detailed here equips decision makers with a powerful method to develop, test, and communicate strategies to find long-term sustainable solutions for complex issues in business and society.

Innovation Outcomes and Partner-Type Selection in R&D Alliances: The Role of Simultaneous Diversification and Sequential Adaptation

This study focuses on how firms form and sequentially adapt their inter-organizational knowledge sourcing structures within research and development (R&D) alliances and how this process impacts their innovation performance. In contrast to the previous literature that mainly ignores the dynamic aspects of how firms adapt their search strategies, our approach accounts for sequential adaptation. Our proposed framework explores the role of simultaneous diversification and sequential adaptation of collaboration partners within R&D alliances according to specific innovation outcomes. The results emphasize that firms should not remain within the same search activities indefinitely, as non-adapting inter-organizational knowledge transfer structures lead to inferior performance. Notably, this study highlights important partner-type selectivity and identifies appropriate simultaneous diversification and sequential adaptation strategies in relation to specific innovation outcomes and firm sizes.

The Effectiveness of Public R&D Subsidies and the Role of Collaboration

This study investigates the efficacy of public R&D support. Compared to most existing studies, we do not stop at substitution effects or general innovation outcome measures, but we are interested in knowing where the policy effect is highest: on innovation close to the market (i.e. incremental innovation) or on innovation that is still far from the market and hence more risky and radical. Using firm level data from the period 1999 to 2011, we find that the policy hits where the market failure is highest, that is, for radical innovation. Taking into account that the Swiss funding agency encourages collaboration, we find no evidence that the impact of the policy is positively effected by various R&D collaboration patterns.

Making Sustainable Strategy in Complex Management Environments: Proposition for a Systemic and Practice-Oriented Methodology

The increasing complexity of the modern world creates both higher risks and new interdependencies in the socioeconomic environment. To cope with these challenges powerful new tools must be applied to find sustainable solutions. System dynamics is a field that offers potential assistance in dealing with complex issues. However, managers and politicians often lack the knowledge and necessary skills to apply quantitative methods in their decision-making process. In contrast, qualitative approaches are easily understood and handled but have limited capacities for analysis. To address this gap, we have developed a bundle of tools tailored for managers and politicians facing complex problems. These tools enable executives to recognize effective levers and assess potential consequences of specific interventions in a highly interconnected system. The approach detailed here equips decision makers with a powerful method to develop, test, and communicate strategies to find long-term sustainable solutions for complex issues in business and society.