13 research outputs found
Polariton Nanophotonics using Phase Change Materials
Polaritons formed by the coupling of light and material excitations such as
plasmons, phonons, or excitons enable light-matter interactions at the
nanoscale beyond what is currently possible with conventional optics. Recently,
significant interest has been attracted by polaritons in van der Waals
materials, which could lead to applications in sensing, integrated photonic
circuits and detectors. However, novel techniques are required to control the
propagation of polaritons at the nanoscale and to implement the first practical
devices. Here we report the experimental realization of polariton refractive
and meta-optics in the mid-infrared by exploiting the properties of low-loss
phonon polaritons in isotopically pure hexagonal boron nitride (hBN), which
allow it to interact with the surrounding dielectric environment comprising the
low-loss phase change material, GeSbTe (GST). We demonstrate
waveguides which confine polaritons in a 1D geometry, and refractive optical
elements such as lenses and prisms for phonon polaritons in hBN, which we
characterize using scanning near field optical microscopy. Furthermore, we
demonstrate metalenses, which allow for polariton wavefront engineering and
sub-wavelength focusing. Our method, due to its sub-diffraction and planar
nature, will enable the realization of programmable miniaturized integrated
optoelectronic devices, and will lay the foundation for on-demand biosensors.Comment: 15 pages, 4 figures, typos corrected in v
Tailoring Crystallization Kinetics of Chalcogenides for Photonic Applications
Chalcogenides possess interesting optical properties, which are attractive for a variety of applications such as data storage, neuromorphic computing, and photonic switches. Lately a group of covalently bonded chalcogenides including Sb2Se3 and Sb2S3 has moved into the focus of interest for such photonic applications, where high optical contrast as well as reliable and fast switching is of crucial importance. Here, these properties of Sb2Se3 are examined and compared with typical phase change materials such as GeSb2Te4 and Ge2Sb2Te5. Sb2Se3 is favorable for many photonic applications due to its larger band gap, yet, the maximum optical contrast achievable is smaller than for GeTe and Ge2Sb2Te5. Furthermore, crystallization needs significantly longer and exhibits a distinctively wider stochastic distribution of reflectances after crystallization, which provides challenges for the usage in photonic applications. At the same time, the glassy/amorphous state of Sb2Se3 is more stable. These differences can be attributed to differences in bonding of the crystalline state, which is more covalent for Sb2Se3. A quantum-chemical map can help to understand and explain these trends and facilitates the design of tailored materials for photonic applications
Investigations for Material Tracing in Selective Laser Sintering: Part ΙΙ: Validation of Modified Polymers as Marking Agents
Selective laser sintering (SLS) is currently in transition to the production of functional components. However, the ability to apply it is confronted with new requirements for reliability and reproducibility. Therefore, an in-depth understanding of aging processes in polymers is essential. Regarding material traceability as well as defective component identification with subsequent cause tracing, the application of a material-inherent marking technology represents a solution. SLS in combination with modified polymers as a marking technology proves to be an efficient opportunity to produce reproducible and high-quality components due to an increased understanding of the process. Based on a selection of modified polymers for use in SLS, which were characterized in part I of the study, this work focuses on the experimental validation of the result. The influence of modified polymers on materials and component properties and the SLS process’s influence on the traceability of modified polymers are examined. Intrinsic and extrinsic material properties as well as mechanical properties, surface quality and sinter density are analyzed. No discernible influences of the modified polymers on the investigated properties could be observed and the traceability of the modified polymers could also be confirmed in the aged powder and component using mass spectroscopy
Atomic disordering processes in crystalline GeTe induced by ion irradiation
The damaging process of GeTe up to amorphization has been studied by introducing controlled levels of disorder by irradiation with 150 keV Ar+ ions. In situ reflectivity measurements and ex-situ resistance and Raman spectroscopy analysis have been employed to study the impact of ion bombardment on the electrical conduction properties and on the bonding. The results obtained are indicative for three different stages of film damage. The first step appears to be dominated by point defects, affecting the temperature coefficient of resistance (TCR) and inducing a transition from positive (metallic conduction) to negative TCR values (conduction dominated by localized states), whilst the material still remains crystalline. The second step is characterized by the annealing of the defects induced, presumably, by the formation of complex defects that act as sinks for point defect recombination. This process is facilitated by the high atomic mobility. The third phase of damage starts at a fluence of 3.5  ×  1014 cm−2 and finally converts the material to the amorphous state, characterized by higher resistance and decreased optical reflectivity. The modifications observed upon ion irradiation provide important insights into the possible states that can be achieved in crystalline GeTe through different local atomic arrangements towards amorphization