A5004472180- Semiconductor Quantum Structures and Devices
- Photonic and Optical Devices
- Strong Light-Matter Interactions
- Quantum Information and Cryptography
- Mechanical and Optical Resonators
- Semiconductor Lasers and Optical Devices
- 2D Materials and Applications
- Molecular Junctions and Nanostructures
- Plasmonic and Surface Plasmon Research
- Thermal Radiation and Cooling Technologies
- Nanowire Synthesis and Applications
- Chalcogenide Semiconductor Thin Films
- Photoreceptor and optogenetics research
- Photonic Crystals and Applications
Carl von Ossietzky Universität Oldenburg
2023
St Petersburg University
2019-2022
Solid-state single-photon sources are central building blocks in quantum information processing. Atomically thin crystals have emerged as of nonclassical light; however, they perform below the state-of-the-art devices based on volume crystals. Here, we implement a bright source an atomically sheet WSe2 coupled to tunable optical cavity liquid-helium-free cryostat without further need for active stabilization. Its performance is characterized by high purity (g(2)(0) = 4.7 ± 0.7%) and...
Emitter dephasing is one of the key issues in performance solid-state single-photon sources. Among various sources dephasing, acoustic phonons play a central role adding decoherence to emission. Here, we demonstrate that it possible tune and engineer coherence photons emitted from single WSe2 monolayer quantum dot via selectively coupling spectral cavity resonance. We utilize an open enhancement, leveling, suppression highly asymmetric phonon sideband, finding excellent agreement with...
Organic exciton-polaritons, which arise from the strong light-matter coupling between excitons in organic molecules and cavity photons, have emerged as a versatile platform for investigation of polariton lasing, Bose-Einstein condensation many-body phenomena at ambient conditions. Here, we study exciton-polaritons fluorescent protein-filled microcavities with elliptical cross-sections. The structural anisotropy these cavities yields distinct optical polarization splitting, investigate both...
Solid-state single photon sources are central building blocks in quantum communication networks and on-chip information processing. Atomically thin crystals were established as possible candidates to emit non-classical states of light, however, the performance monolayer-based has so far been lacking behind state-of-the-art devices based on volume crystals. Here, we implement a source an atomically sheet WSe2 coupled spectrally tunable optical cavity. It is characterized by high purity with...
Emitter dephasing is one of the key issues in performance solid-state single photon sources. Among various sources dephasing, acoustic phonons play a central role adding decoherence to emission. Here, we demonstrate, that it possible tune and engineer coherence photons emitted from WSe$_2$ monolayer quantum dot via selectively coupling spectral cavity resonance. We utilize an open demonstrate enhancement, leveling, suppression highly asymmetric phonon sideband, finding excellent agreement...
Topological photonics is an emergent research discipline which interlinks fundamental aspects of photonics, information processing and solid-state physics. Exciton-polaritons are a specifically interesting platform to study topological phenomena, since the coherent light matter coupling enables new degrees freedom such as tunable non-linearities, chiralities dissipation. Room-temperature operation exciton-polaritons relies on materials comprising both, large exciton binding energies...
Optical resonators are a powerful platform to control the spontaneous emission dynamics of excitons in solid-state nanostructures. Here, we study MoSe$_2$-WSe$_2$ van-der-Waals heterostructure that is integrated widely tunable open optical microcavity gain insights into fundamental properties emergent interlayer charge-transfer excitons. First, utilize an ultra-low quality factor planar vertical cavity and investigate modification excitonic lifetime as on- off-resonant conditions met with...
Abstract In this work we investigate the reflectance spectra of GaAs/AlGaAs/AlAs-based coupled microcavities consisting two cavity layers separated and surrounded by distributed Bragg reflectors (DBRs). The observed optical modes are described harmonic oscillators model with parameters derived from modelling layered structure transfer matrix method. theory explains anticrossing behaviour position on sample, being able to reveal cavities thickness gradients.
Abstract In this work we propose means to determine the dispersion of light in a semiconductor total internal reflection (TIR) planar waveguide featuring dielectric response excitons from quantum well (QW). The given theoretical apparatus is then used reproduce data experimentally acquired when probing AlGaAs-based (with GaAs QW its waveguiding layer) with continuous laser through coupling grating and gathering transmitted layer.
In this work we propose a controllable dispersion compensation mirror based on Fabry-Perot interferometer with quantum well. The choice of the parameters heterostructure and experiment geometry makes it possible to introduce negative in narrow spectral region maintaining constant reflection coefficient. Feasibility concept is proved experimentally by measurements reflectivity form InGaAs/GaAs control well exciton could be used switch off.