A5041066551- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Photonic Crystals and Applications
- Near-Field Optical Microscopy
- Strong Light-Matter Interactions
- Plasmonic and Surface Plasmon Research
- Semiconductor Lasers and Optical Devices
- Molecular Junctions and Nanostructures
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
- Spectroscopy and Quantum Chemical Studies
- Diamond and Carbon-based Materials Research
- Laser-Matter Interactions and Applications
- Advanced Fluorescence Microscopy Techniques
- Quantum Dots Synthesis And Properties
- Graphene research and applications
- Orbital Angular Momentum in Optics
- Advanced biosensing and bioanalysis techniques
- Nonlinear Optical Materials Studies
- Nanowire Synthesis and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Photorefractive and Nonlinear Optics
Friedrich-Alexander-Universität Erlangen-Nürnberg
2014-2024
Max Planck Institute for the Science of Light
2015-2024
Max Planck Society
2013-2020
Electro Optical Systems (Germany)
2019-2020
Max Planck Institute for the History of Science
2015
ETH Zurich
2006-2012
Stanford University
2005-2007
Humboldt-Universität zu Berlin
2003-2006
University of Konstanz
2001-2005
Universität Hamburg
2003-2004
We report the synthesis and characterization of highly luminescent colloidal nanocrystals consisting CdSe cores protected with double inorganic shells (core−shell−shell nanocrystals). The outer ZnS shell provides efficient confinement electron hole wave functions inside nanocrystal as well high photochemical stability. Introducing middle (CdS or ZnSe) sandwiched between core allows considerable reducing strain because CdS ZnSe have lattice parameter intermediate to those ZnS. In contrast...
We demonstrate that efficient shape control may be achieved in the shell of colloidally grown semiconductor nanocrystals (independent core), allowing combination a 0-D spherical CdSe core with 1-D rodlike CdS shell. Besides exhibiting linearly polarized emission room-temperature quantum efficiency above 70%, these mixed-dimensionality colloidal heterostructures display large, length-dependent Stokes shifts as well giant extinction coefficients approaching 107cm-1 M-1.
We observe antibunching in the photons emitted from a strongly-coupled single quantum dot and pillar microcavity resonance. When was spectrally detuned cavity mode, emission remained antibunched, also anticorrelated emission. Resonant pumping of selected via an excited state enabled these observations by eliminating background emitters that are usually coupled to cavity. This device demonstrates on-demand photon source operating strong coupling regime, with Purcell factor 61 effciency 97%
We present experiments where a single subwavelength scatterer is used to examine and control the backscattering induced coupling between counterpropagating high-$Q$ modes of microsphere resonator. Our measurements reveal standing wave character resulting symmetric antisymmetric eigenmodes, their unbalanced intensity distributions, coherent nature coupling. discuss our findings underlying classical physics in framework common quantum optics provide particularly intuitive explanation central processes.
We study the momentum distribution and relaxation dynamics of semiconductor microcavity polaritons by angle-resolved time-resolved spectroscopy. Above a critical pump level, thermalization time at positive detunings becomes shorter than their lifetime, form quantum degenerate Bose-Einstein in thermal equilibrium with lattice.
We demonstrate two-photon interference using two remote single molecules as bright solid-state sources of indistinguishable photons. By varying the transition frequency and spectral width one molecule, we tune explore effect photon distinguishability. discuss future improvements on brightness single-photon beams, their integration by large numbers chips, extension our experimental scheme to coupling entanglement distant molecules.
Covalent monolayer sheets in 2 hours: spreading of threefold anthracene-equipped shape-persistent and amphiphilic monomers at the air/water interface followed by a short photochemical treatment provides access to infinitely sized, strictly monolayered, covalent with in-plane elastic modulus range 19 N/m. As service our authors readers, this journal supporting information supplied authors. Such materials are peer reviewed may be re-organized for online delivery, but not copy-edited or...
A single quantum emitter can possess a very strong intrinsic nonlinearity, but its overall promise for nonlinear effects is hampered by the challenge of efficient coupling to incident photons. Common optical materials, on other hand, are easy couple bulky, imposing severe limitation miniaturization photonic systems. In this Letter, we show that organic molecule acts as an extremely element in regime cavity electrodynamics. We report single-photon sensitivity signal generation and all-optical...
Exploring the interaction of light and matter at ultimate limit single photons emitters is great interest both from a fundamental point view for emerging applications in quantum engineering. However, difficulty generating with specific wavelengths, bandwidths brightness as well weak probability photon an optical emitter pose formidable challenge toward this goal. Here, we demonstrate general approach based on creation their use performing spectroscopy second situated distance. Although used...
Many of the currently pursued experiments in quantum optics would greatly benefit from a strong interaction between light and matter. Here, we present simple new scheme for efficient coupling single molecules photons. A glass capillary with diameter 600 nm filled an organic crystal tightly guides excitation provides maximum spontaneous emission factor ($\ensuremath{\beta}$) 18% dye doped crystal. combination extinction, fluorescence excitation, resonance spectroscopy microscopy...
We report on the experimental realization of an absolute single-photon source based a single nitrogen vacancy (NV) center in nanodiamond at room temperature and calculation its spectral photon flux from data. The was calibrated with respect to rate density. measured low-noise silicon photodiode traceable primary standard for optical flux, taking into account power distribution using spectroradiometer. radiant is adjustable 55 fW, which almost lowest detection limit photodiode, 75 fW,...
Multiexcitonic transitions and emission of several photons per excitation comprise a very attractive feature semiconductor quantum dots for optoelectronics applications. However, these higher-order radiative processes are usually quenched in colloidal by Auger other nonradiative decay channels. To increase the multiexcitonic efficiency, groups have explored plasmonic enhancement, so far with moderate results. By controlled positioning individual near field gold nanocone antennas, we enhance...
The discovery of room-temperature single-photon emitters (SPEs) hosted by two-dimensional hexagonal boron nitride (2D hBN) has sparked intense research interest. Although in the vicinity 2 eV have been studied extensively, their microscopic identity remained elusive. discussion this class SPEs centered on point defects hBN crystal lattice, but none candidate defect structures able to capture great heterogeneity emitter properties that is observed experimentally. Employing a widely used...
We report a quantum dot microcavity laser with cw sub- lasing threshold, where significant reduction of the threshold is observed when single (QD) state aligned cavity mode. The quality factor exceeds 15 000 before system lases. When no QD states are resonant, below mode initially degrades increasing pump power, after which saturation occurs and then recovers. associate initial spoiling broadening that power.
We investigate the optical properties of Dibenzoterrylene (DBT) molecules in a spin-coated crystalline film anthracence. By performing single molecule studies, we show that dipole moments DBT are oriented parallel to plane film. Despite thickness only 20 nm, observe an exceptional photostability at room temperature and photon count rates around one million per second from molecule. These together with emission wavelength 800 nm make this system attractive for applications nanophotonics...
In Nature Photonics 5, 166 (2011), we reported on a planar dielectric antenna that achieved 96% efficiency in collecting the photons emitted by single molecule. work transition dipole moment of molecule was set perpendicular to plane. Here, present an extension scheme reaches collection efficiencies beyond 99% for emitters with arbitrarily oriented moments. Our opens important doors wide range contexts including quantum optics, metrology, nano-analytics, and biophysics. particular, provide...