A5019479962- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- Quantum Information and Cryptography
- Semiconductor Lasers and Optical Devices
- Near-Field Optical Microscopy
- Advanced Fluorescence Microscopy Techniques
- Diamond and Carbon-based Materials Research
- Laser-induced spectroscopy and plasma
- Neural Networks and Reservoir Computing
- Nanowire Synthesis and Applications
- Quantum Mechanics and Applications
- Advanced Materials Characterization Techniques
- Strong Light-Matter Interactions
- Random lasers and scattering media
- solar cell performance optimization
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Quantum Dots Synthesis And Properties
- Laser Material Processing Techniques
- Quantum Computing Algorithms and Architecture
- Thermal Radiation and Cooling Technologies
- Nonlinear Optical Materials Studies
Paderborn University
2021-2022
University of Stuttgart
2012-2021
Center for Integrated Quantum Science and Technology
2017-2021
Abstract In the current study, we report on deterministic fabrication of solid immersion lenses (SILs) lithographically pre-selected semiconductor quantum dots (QDs). We demonstrate combination state-of-the-art low-temperature in-situ photolithography and femtosecond 3D direct laser writing. Several QDs are with a localization accuracy less than 2 nm lithography three-dimensional writing is then used to deterministically fabricate hemispherical top emitter submicrometric precision. Due...
Efficient on-chip integration of single-photon emitters imposes a major bottleneck for applications photonic integrated circuits in quantum technologies. Resonantly excited solid-state are emerging as near-optimal light sources, if not the lack scalability current devices. Current approaches rely on cost-inefficient individual emitter placement circuits, rendering impossible. A promising scalable platform is based two-dimensional (2D) semiconductors. However, resonant excitation and emission...
Future quantum technology relies crucially on building networks with high fidelity. To achieve this challenging goal, it is of utmost importance to connect individual systems such that their emitted single photons overlap the highest possible degree coherence. This requires perfect mode light from different emitters, which necessitates use single-mode fibres. Here, we present an advanced manufacturing approach accomplish task. We combined 3D printed complex micro-optics, as hemispherical and...
In the present study, we report on deterministic integration of quantum dots, emitting in telecom O-band, into wet-chemically fabricated Gaussian-shaped microlenses which exhibit a surface quality comparable to epi-ready wafers. The slow wet-chemical etching rate enables us gain control lens aspect-ratio and vertical position with respect dot, allowing engineer far field shape better match acceptance profile single-mode fibers. Maximum light enhancement values around 10 16 could be achieved...
In the present work, we investigate coupling of deterministically pre-selected In(Ga)As/GaAs quantum dots (QDs) to low Q circular Bragg grating cavities by employing a combination state-of-the-art low-temperature in-situ optical lithography and electron-beam lithography. The spatial overlap between cavity mode emitter is ensured through accurate determination QD position via precise interferometric readout. Simultaneously, high precision exploited for fabrication. order optimize spectral...
Abstract Scaling up photonic quantum devices to reach complexities allowing solve real-world problems requires a platform enabling scalable integration of solid-state emitter with high yield. Their nanometer-size together their excellent optical properties make them the ideal candidates for on-chip technologies. However, robust, remains elusive. Here, we discuss state-of-the-art methods integrate emitters into integrated circuits, emphasizing pros and cons applicable specific emitters. Based...
User-friendly single-photon sources with high photon-extraction efficiency are crucial building blocks for photonic quantum applications. For many of these applications, such as long-distance key distribution, the use single-mode optical fibers is mandatory, which leads to stringent requirements regarding device design and fabrication. We report on on-chip integration a dot microlens 3D-printed micro-objective in combination fiber coupler. The practical realized by deterministic fabrication...
We investigate the effect of multiphoton emission on polarization-entangled photon pairs from a coherently driven quantum dot by comparing state tomography and second-order autocorrelation measurements as function excitation power. observe that relative (absolute) probability is low...
Cavity quantum electrodynamics is widely used in many solid-state systems for improving emitter performances or accessing specific physical regimes. For these purposes it fundamental that the non-classical emitter, like a dot an NV center, matches cavity mode, both spatially and spectrally. In present work, we couple single photons stemming from In(Ga)As dots into open fiber-based Fabry–Pérot cavity. Such system allows reaching optimal spatial spectral matching every optical transition, by...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Johannes Roth, Steffen Sonntag, Karlin, Carolina Trichet Paredes, Marc Sartison, Armin Krauß, Hans-Rainer Trebin; Molecular dynamics simulations studies of laser ablation in metals. AIP Conference Proceedings 30 July 2012; 1464 (1): 504–523. https://doi.org/10.1063/1.4739905 Download citation file: Ris (Zotero)...
In the present study, we developed a deterministic fabrication process for an electrically driven single-photon light-emitting diode based on InP quantum dots (QDs) emitting in red spectral range, where wavelength of interest coincides with high efficiency window most commonly available standard Si avalanche photodiodes (APDs). A lithography technique allowed preselection suitable QD, here exclusively operated under electrical carrier injection. The final device was characterized...
Future quantum technology relies crucially on building networks with high fidelity. To achieve this challenging goal, it is of utmost importance to connect single systems in a way such that their emitted single-photons overlap the highest possible degree coherence. This requires perfect mode light different emitters, which necessitates use fibers. Here we present an advanced manufacturing approach accomplish task: combine 3D printed complex micro-optics as hemispherical and Weierstrass solid...
Unwanted multiphoton emission commonly reduces the degree of entanglement photons generated by non-classical light sources and, in turn, hampers their exploitation quantum information science and technology. Quantum emitters have potential to overcome this hurdle but, so far, effect on quality has never been addressed detail. Here, we tackle challenge using photon pairs from a resonantly-driven dot comparing state tomography second-order coherence measurements as function excitation power....
We demonstrate the on-chip integration of a deterministically fabricated quantum dot micro-lens, 3D-printed micro-objective and single-mode fiber-coupler. The resulting device has broadband photon extraction efficiency with coupling 22%.