114 Dokumente gefunden
Optical coupling of semiconductor nanowires
The continued growth of computational demand has shifted performance and energy-efficiency bottlenecks from individual processors to data movement, where electronic interconnects are increasingly constrained by bandwidth and energy consumption. Photonic integrated circuits offer a promising solution…
Optical emission of hybridized nanowire lasers
As optoelectronic devices approach the nanometer scale, conventional integration concepts are increasingly restricted by losses in electrical interconnects, which dominate the overall performance and stability. Nanoscale laser sources can overcome these constraints by acting as on-chip optical interconnects.…
Intense Photoluminescence in Erbium‐Ion‐Implanted Lithium Niobate Thin Films and Its Interplay with Lattice Defects
Erbium‐doped lithium niobate on insulator (Er‐LNOI) has attracted significant attention for its potential in integrated photonics and quantum applications due to its efficient 1540 nm emission in the telecom band. In this work, the lattice damage and infrared photoluminescence of Er‐LNOI fabricated via…
Weinheim: Wiley-VCH, 2025-10-14
Enhancement and quenching of ZnO nanowire luminescence by electron irradiation
aus: Discover Nano
Abstract Electron microscopy is an essential tool in the fabrication and characterization of optoelectronic devices. This study systematically investigated the stability of zinc oxide nanowires under electron irradiation, focusing on spontaneous and stimulated emission as well as their waveguiding properties.…
New York: Springer US, 2025-09-12
Präparation und Charakterisierung von III-V Halbleiternanodrähten für die regenerative Energieversorgung
Die vorliegende Arbeit beleuchtet die potenziellen Vorteile von Nanodrähten aus III-V-Halbleitern gegenüber herkömmlichen, planaren Halbleitern, insbesondere für zukünftige technologische Anwendungen in der solaren Energiekonversion. Eine der größten Herausforderungen in der Nanodraht-Forschung liegt…
Time-domain analysis of mode competition in ZnO nanowire lasers in inhomogeneous environments
Zinc oxide (ZnO) nanowire lasers are increasingly integrated into complex optoelectronic devices as a source of coherent radiation. To enable the rational design of these devices, it is crucial to understand how both the nanowire resonator and its surrounding environment influence mode competition and…
Dordrecht [u.a.]: Springer Science + Business Media B.V, 2025-01-17
Design and charactristics of ultraviolet nanowire plasmonic lasers
This thesis explores semiconductor nanowires as nanolasers for nanophotonic applications due to their unique structure, which enables scalable fabrication, on-chip integration, and effective generation of coherent radiation. In particular, this study focuses on the investigation of ultraviolet plasmonic…
Tracing the Formation of Femtosecond Laser-Induced Periodic Surface Structures (LIPSS) by Implanted Markers
The generation of laser-induced periodic surface structures (LIPSS) using femtosecond lasers facilitates the engineering of material surfaces with tailored functional properties. Numerous aspects of their complex formation process are still under debate, despite intensive theoretical and experimental…
Washington, DC: Soc., 2024-12-27
Electrochemical Etching of Nitrogen Ion‐Implanted Gallium Nitride : A Route to 3D Nanoporous Patterning
Dopant‐selective electrochemical etching (ECE) of gallium nitride (GaN) results in well‐defined porous layers with tunable refractive index, which is extremely interesting for integrating photonic components into nitride technology. Herein, the impact of nitrogen implantation with and without subsequent…
Weinheim: Wiley-VCH, 2024-11-11
Optical Characterization of Size‐ and Substrate‐Dependent Performance of Ultraviolet Hybrid Plasmonic Nanowire Lasers
Nanowire‐based plasmonic lasers are now established as nano‐sources of coherent radiation, appearing as suitable candidates for integration into next‐generation nanophotonic circuitry. However, compared to their photonic counterparts, their relatively high losses and large lasing thresholds still pose…
Weinheim: Wiley-VCH, 2024-10-15
Ion Irradiation‐Induced Sinking of Ag Nanocubes into Substrates
Ion irradiation can cause burrowing of nanoparticles in substrates, strongly depending on the material properties and irradiation parameters. In this study, it is demonstrated that the sinking process can be accomplished with ion irradiation of cube‐shaped Ag nanoparticles on top of silicon; how ion…
Weinheim: Wiley-VCH, 2024-01-04
Spatially and temporally resolved X-ray excited optical luminescence spectroscopy of nanomaterials
Luminescent materials play a key role in optoelectronics, photonics, and material science due to their versatile applications. Investigating their luminescence properties is critical to optimizing performance. Synchrotron-based X-ray excited optical luminescence (XEOL) enables high spatial resolution…
Early oxidation stages of austenitic stainless steel monitored using Mn as tracer
Understanding the mechanism of oxide layer growth on 316 L requires knowledge, e.g., about the reaction front position, oxide phase formation and diffusion paths of the elements involved. We gain essential information for the early stages of oxidation up to 600 ◦C, utilizing Mn as tracer in a novel experimental…
A Combination of Ion Implantation and High‐Temperature Annealing: The Origin of the 265 nm Absorption in AlN
The commonly observed absorption around 265 nm in AlN is hampering the outcoupling efficiency of light‐emitting diodes (LEDs) emitting in the UV‐C regime. Carbon impurities in the nitrogen sublattice (C N ) of AlN are believed to be the origin of this absorption. A specially tailored experiment using…
Weinheim: Wiley-VCH, 2023-08-18
A Combination of Ion Implantation and High‐Temperature Annealing: Donor–Acceptor Pairs in Carbon‐Implanted AlN
Herein, carbon‐implanted high‐temperature annealed (HTA) AlN layers are analyzed and donor–acceptor pair (DAP) transitions probably between the two most abundant impurities, carbon and oxygen, are identified. Both are regarded as the main, hard‐to‐avoid impurities in crystal growth. Oxygen is believed…
Weinheim: Wiley-VCH, 2023-08-18
Lasing modes in ZnO nanowires coupled to planar metals
Semiconductor nanowire lasers can be subject to modifications of their lasing threshold resulting from a variation of their environment. A promising choice is to use metallic substrates to gain access to low-volume Surface-Plasmon-Polariton (SPP) modes. We introduce a simple, yet quantitatively precise…
Washington, DC: Soc., 2023-01-16
Spatially Resolved Dynamics of Cobalt Color Centers in ZnO Nanowires
aus: Advanced science
The dynamics of color centers, being a promising quantum technology, is strongly dependent on the local environment. A synergistic approach of X‐ray fluorescence analysis and X‐ray excited optical luminescence (XEOL) using a hard X‐ray nanoprobe is applied. The simultaneous acquisition provides insights…
Weinheim: Wiley-VCH, 2023-01-04
Energy-induced nanoparticle-substrate interactions
In line with Moore's Law, the disciplines of nanoscience and nanotechnology not only address the demands for miniaturization but also improve the efficacy of working devices. There are numerous synthesis methods to produce and replicate the desired nanostructures. However, certain chemical and physical…
Novel reactor design and method for atmospheric pressure chemical vapor deposition of micro and nano SiO2-x films in photovoltaic…
In dieser Arbeit wurden ein kostengünstiges Verfahren und eine Anlage zur chemischen Gasphasenabscheidung von SiO2-x-Schichten bei Atmosphärendruck (atmospheric pressure chemical vapor deposition, APCVD) im Labormaßstab entwickelt. Dabei kommt die Hydrolyse von SiCl4 bei Raumtemperatur zum Einsatz. Der…
Ilmenau: Universitätsverlag Ilmenau, 2022-11-29
Low-energy ion channeling in nanocubes
aus: Nano Research
Focused ion beam (FIB) processing with low-energy ions has become a standard technique for the manipulation of nanostructures. Many underlying ion beam effects that deviate from conventional high-energy ion irradiation of bulk systems are considered today; however, ion channeling with its consequence…
Erschienen: Tsinghua University Press, 2022-07-01