23 Dokumente gefunden
Room-temperature polariton condensate in a quasi-2D hybrid perovskite
Abstract Quasi-2D halide perovskites are chemically synthesized realizations of quantum well stacks with giant exciton oscillator strengths, tunable emission spectra, and very large exciton binding energies. While these features render quasi-2D halide perovskites a promising platform for room-temperature…
[London]: Springer Nature, 2026-01-31
Tuning relaxation and nonlinear upconversion of valley-exciton-polaritons in a monolayer semiconductor
Abstract Controlling exciton relaxation and energy conversion pathways via their coupling to photonic modes is a central task in cavity-mediated quantum materials research. In this context, the light-matter hybridization in optical cavities can lead to intriguing effects, such as modified carrier transport,…
[London]: Springer Nature, 2025-11-03
Tunable Room‐Temperature Polaritons in the Very Strong Coupling Regime in Quasi‐2D Ruddlesden–Popper Perovskites
Layered perovskites are an emergent class of materials, which feature extraordinarily large light–matter coupling, driven by excitons with binding energies significantly beyond the thermal energy at room‐temperature. In this work, widely tunable room‐temperature cavity exciton polaritons are demonstrated…
Weinheim: Wiley-VCH, 2025-10-26
Femtosecond Pulse Shaping with Semiconductor Huygens' Metasurfaces
Abstract Shaping of short laser pulses offers versatile applications in laser material processing, quantum state encoding, ultrafast bio‐chemical reactions, and optical communication. Optical metasurfaces have emerged as highly influential and versatile tools for exerting precise control over the properties…
Weinheim: Wiley-VCH, 2025-06-06
Scalable oxide encapsulation of CVD-grown WS2 and WSe2 for photonic applications
Two-dimensional transition metal dichalcogenides (TMDs) like WS2 and WSe2 demonstrate strong light-matter interactions, including exciton formation, pronounced photoluminescence, and enhanced second-harmonic generation. Van der Waals epitaxy allows for the growth of these semiconducting monolayers on…
Washington, DC: Optica Publishing Group, 2025-06-01
Enhanced Exciton–Plasmon Interaction Enabling Observation of Near-Field Photoluminescence in a WSe 2 –Gold Nanoparticle Hybrid…
aus: ACS Photonics
Monolayer transition metal dichalcogenides, such as tungsten diselenide, have recently attracted considerable attention due to their reduced dielectric screening and direct bandgap, which result in high exciton binding energy and strong photoluminescence. The integration of monolayer transition metal…
Washington, DC: American Chemical Society, 2025-05-05
Fabrication of low-loss lithium niobate on insulator waveguides on the wafer scale [Invited]
We report on the wafer scale fabrication of single-mode low-loss lithium niobate on insulator waveguides utilizing a chemically amplified resist and an optimized dry etching method. The fabricated single-mode waveguides are free of residuals and re-deposition, with measured losses for straight waveguides…
Washington, DC: Optica Publishing Group, 2025-02-01
Photoluminescence-based gas sensing with MoS2 monolayers
Two-dimensional transition metal dichalcogenides (TMDs) are highly appealing for gas sensors, lab-on-a-chip devices, and biosensing applications because of their strong light-matter interaction and high surface-to-volume ratio. The ability to grow these van der Waals materials on different substrates…
Washington, DC: Optica Publishing Group, 2025
Second harmonic generation in monolithic gallium phosphide metasurfaces
aus: Nanophotonics
Gallium phosphide (GaP) offers unique opportunities for nonlinear and quantum nanophotonics due to its wide optical transparency range, high second-order nonlinear susceptibility, and the possibility to tailor the nonlinear response by a suitable choice of crystal orientation. However, the availability…
Berlin: De Gruyter, 2024-07-11
Quantitative Investigation of Quantum Emitter Yield in Drop-Casted Hexagonal Boron Nitride Nanoflakes
Single photon emitters (SPEs) are a key component for their use as pure photon source in quantum technologies. In this study, we investigate the generation of SPEs from drop-casted hexagonal boron nitride (hBN) nanoflakes, examining the influence of the immersion solution and the source of hBN. We show…
Washington, DC: American Chemical Society, 2024-07-02
Towards Double Resonant Cavity Enhanced Second Harmonic Generation in Monolayer MoS 2
A characteristic property of monolayered transition metal dichalcogenides is their strong nonlinear response. While they display a high conversion efficiency per atomic layer, due to their low thickness, the absolute value of their nonlinear response remains low. Here enhancement of the second harmonic…
Weinheim: Wiley-VCH, 2024-02-28
Spectroscopic Study of the Excitonic Structure in Monolayer MoS 2 under Multivariate Physical and Chemical Stimuli
Photoluminescence (PL) spectroscopy has proven to provide deep insights into the optoelectronic properties of monolayer MoS 2 $\left(\text{MoS}\right)_{2}$ . Herein, a corresponding study is conducted on the excitonic properties of mechanically exfoliated monolayer MoS 2 $\left(\text{MoS}\right)_{2}$…
Weinheim: Wiley-VCH, 2024-01-10
Guided waves systems with embedded two-dimensional materials
Two-dimensional (2D) semiconducting materials are attracting lots of attention from the scientific community because of their unique physical properties, strong light-matter interaction per unit thickness, and van der Waals epitaxy. Amongst them, semiconducting transition metal dichalcogenides (TMDs)…
Creation and investigation of hybrid photonic nanostructures with TMDs
The rapid advancement of technology demands innovative materials and scalable fabrication methods for faster data transport and miniaturized devices. Transition metal dichalcogenides (TMDs), with exceptional optoelectronic properties, show promise for hybrid photonic nanostructures. However, current…
Precision Tailoring Quasi-BIC Resonance of a-Si:H Metasurfaces
The capability of tailoring the resonance wavelength of metasurfaces is important as it can alleviate the manufacturing precision required to produce the exact structure according to the design of the nanoresonators. Tuning of Fano resonances by applying heat has been theoretically predicted in the case…
Basel: MDPI, 2023-06-05
Patterned Growth of Transition Metal Dichalcogenide Monolayers and Multilayers for Electronic and Optoelectronic Device Applications
aus: Small methods
A simple, large area, and cost‐effective soft lithographic method is presented for the patterned growth of high‐quality 2D transition metal dichalcogenides (TMDs). Initially, a liquid precursor (Na 2 MoO 4 in an aqueous solution) is patterned on the growth substrate using the micromolding in capillaries…
Weinheim: WILEY-VCH Verlag GmbH & Co. KGaA, 2022-09-19
Direct growth of monolayer MoS 2 on nanostructured silicon waveguides
aus: Nanophotonics
We report for the first time the direct growth of molybdenum disulfide (MoS 2 ) monolayers on nanostructured silicon-on-insulator waveguides. Our results indicate the possibility of utilizing the Chemical Vapour Deposition (CVD) on nanostructured photonic devices in a scalable process. Direct growth…
Berlin: De Gruyter, 2022-08-22
Third harmonic generation in liquid core optical fibres
The objective of this thesis is to investigate third harmonic generation in liquid core fibres. Such fibres are formed by injection of liquid into a hollow, solid cladding by capillary forces. Carbon disulphide and tetrachloroethylene are identified as most promising liquid candidates. Such liquids offer…