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In the case of an ideal rubber, one often thinks of the linear dependence of the shear modulus on temperature as an expression of the typical entropy elasticity. However, temperature dependencies of typical technical rubber materials are known to be much more complicated. This has consequences for t...
In the case of an ideal rubber, one often thinks of the linear dependence of the shear modulus on temperature as an expression of the typical entropy elasticity. However, temperature dependencies of typical technical rubber materials are known to be much more complicated. This has consequences for t...
THIS work presents new insights into optical loss dynamics in semiconductor
bulk- and metastructures. To this end, a widely applicable modeling scheme for
the calculation of photoinduced charge carrier and heat dynamics in arbitrarily
shaped semiconductor structures is developed. Analytical solut...
This work presents a comprehensive modeling strategy for advanced large-size AlGaN/GaN HEMTs. A 22-element equivalent circuit with 12 extrinsic elements, including 6 capacitances, serves as small-signal model and as basis for a large-signal model. Analysis of such capacitances leads to original equa...
This thesis analyzes the spectral and tuning behavior of high-power GaAs-based DFB laser diodes, with special focus on mode hops. Two types of 780 nm DFB lasers were studied:
(1) devices with a uniform Bragg grating, HR rear facet, and AR front facet, and
(2) devices with both facets AR-coated and a...
This thesis analyzes the spectral and tuning behavior of high-power GaAs-based DFB laser diodes, with special focus on mode hops. Two types of 780 nm DFB lasers were studied:
(1) devices with a uniform Bragg grating, HR rear facet, and AR front facet, and
(2) devices with both facets AR-coated and a...
Nanomedicine represents one of the most investigated areas in the last two decades in the field of pharmaceutics. Several nanovectors have been developed and a growing number of products have been approved. It is well known that many biomaterials are able to self-organize under controlled conditions...
GaN HEMTs are regarded as one of the most promising RF power transistor technologies thanks to their high-voltage high-speed characteristics. However, they are still known to be prone to trapping effects, which hamper achievable output power and linearity. Hence, accurately and efficiently modeling ...
For more than 50 years, silicon has dominated the electronics industry. However, this growth will come to an end, due to resources limitations. Thus, research developments need to focus to alternative materials, with higher performance and better functionality. Current research achievements have ind...
Nanostructured materials exploit physical phenomena and mechanisms that cannot be derived by simply scaling down the associated bulk structures and phenomena; furthermore, new quantum effects come into play in nanosystems. The exploitation of these emerging nanoscale interactions prompts the innovat...
Construction materials are the most widely used materials for civil infrastructure in our daily lives. However, from an environmental point of view, they consume a huge amount of natural resources and generate the majority of greenhouse gasses. Therefore, many new and novel technologies for designin...