48 Dokumente gefunden
Nonlinear Optical Properties of Mono and Multilayer MoWSe 2 Alloys
Abstract Transition metal dichalcogenide (TMD) alloys provide a stable and reliable platform for broadband tuning of excitonic resonances. Here, the nonlinear optical response of Mo (1 − x) W x Se 2 , focusing in particular on second harmonic generation (SHG) and two‐photon photoluminescence (TP‐PL),…
Weinheim: Wiley-VCH, 2025-10-14
Progress in integrated and fiber optics for time-bin based quantum information processing
The development of integrated photonic systems, both on-chip and fiber-based, has transformed quantum photonics by replacing bulky, fragile free-space optical setups with compact, efficient, and robust circuits. Photonic platforms incorporating fiber-connected sources of correlated and entangled photon…
Erschienen: Frontiers Media S.A., 2025-04-11
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
Wafer-scale nanofabrication of sub-5 nm gaps in plasmonic metasurfaces
aus: Nanophotonics
In the rapidly evolving field of plasmonic metasurfaces, achieving homogeneous, reliable, and reproducible fabrication of sub-5 nm dielectric nanogaps is a significant challenge. This article presents an advanced fabrication technology that addresses this issue, capable of realizing uniform and reliable…
Berlin: De Gruyter, 2024-08-28
Time-domain modeling of interband transitions in plasmonic systems
aus: Applied Physics B
Efficient modeling of dispersive materials via time-domain simulations of the Maxwell equations relies on the technique of auxiliary differential equations. In this approach, a material’s frequency-dependent permittivity is represented via a sum of rational functions, e.g., Lorentz poles, and the associated…
Berlin Heidelberg: Springer, 2023-12-07
Nonlinear All‐Optical Coherent Generation and Read‐Out of Valleys in Atomically Thin Semiconductors
aus: Small : nano micro
Abstract With conventional electronics reaching performance and size boundaries, all‐optical processes have emerged as ideal building blocks for high speed and low power consumption devices. A promising approach in this direction is provided by valleytronics in atomically thin semiconductors, where light‐matter…
Weinheim: Wiley-VCH, 2023-09-13
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
Beyond classical electrodynamics : mesoscale electron dynamics and nonlinear effects in hybrid nanostructured systems
This work investigates the optial properties of hybrid metal-dielectric and ionic-solid largely regular nanostructures in the presence of nanosized features such as gaps and thin walls in tubular structures. The fundamental optical response of plasmonic, ionic and dielectric systems is considered from…
Induced photon correlations through the overlap of two four‐wave mixing processes in integrated cavities
Induced photon correlations are directly demonstrated by exploring two coupled nonlinear processes in an integrated device. Using orthogonally polarized modes within an integrated microring cavity, phase matching of two different nonlinear four‐wave mixing processes is achieved simultaneously, wherein…
Weinheim: Wiley, 2020-09-09
Experiments on synthetic dimensions in photonics
The first and introductory section of the dissertation presents the working principle of a one- and two-dimensional photonic mesh lattice based on the time-multiplexing technique. The basis of a random walk interrelated to the corresponding light and quantum walk is comprehensively discussed as well.…
Nonlinearity, topology and PT symmetry in Photonic Lattices
Bereits seit über einem Jahrzehnt besteht ein stetig wachsendes Interesse der Wissenschaftsgemeinde an den hochaktuellen Themen von sogenannter Parität-Zeit (PT ) Symmetrie und topologischen Phasen der Materie, die historisch aus nicht-hermitischen Erweiterungen der Quantenmechanik bzw. Phasenübergängen…