TY  - JOUR
A1  - Winkler, Karol
A1  - Fischer, Julian
A1  - Schade, Anne
A1  - Amthor, Matthias
A1  - Dall, Robert
A1  - Geßler, Jonas
A1  - Emmerling, Monika
A1  - Ostrovskaya, Elena A.
A1  - Kamp, Martin
A1  - Schneider, Christian
A1  - Höfling, Sven
T1  - A polariton condensate in a photonic crystal potential landscape
JF  - New Journal of Physics
N2  - The possibility of investigating macroscopic coherent quantum states in polariton condensates and of engineering polariton landscapes in semiconductors has triggered interest in using polaritonic systems to simulate complex many-body phenomena. However, advanced experiments require superior trapping techniques that allow for the engineering of periodic and arbitrary potentials with strong on-site localization, clean condensate formation, and nearest-neighbor coupling. Here we establish a technology that meets these demands and enables strong, potentially tunable trapping without affecting the favorable polariton characteristics. The traps are based on a locally elongated microcavity which can be formed by standard lithography. We observe polariton condensation with non-resonant pumping in single traps and photonic crystal square lattice arrays. In the latter structures, we observe pronounced energy bands, complete band gaps, and spontaneous condensation at the M-point of the Brillouin zone.
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-125050
VL  - 17
ER  - 
TY  - JOUR
A1  - Heil, Hannah S.
A1  - Schreiber, Benjamin
A1  - Götz, Ralph
A1  - Emmerling, Monika
A1  - Dabauvalle, Marie-Christine
A1  - Krohne, Georg
A1  - Höfling, Sven
A1  - Kamp, Martin
A1  - Sauer, Markus
A1  - Heinze, Katrin G.
T1  - Sharpening emitter localization in front of a tuned mirror
JF  - Light: Science & Applications
N2  - Single-molecule localization microscopy (SMLM) aims for maximized precision and a high signal-to-noise ratio1. Both features can be provided by placing the emitter in front of a metal-dielectric nanocoating that acts as a tuned mirror2,3,4. Here, we demonstrate that a higher photon yield at a lower background on biocompatible metal-dielectric nanocoatings substantially improves SMLM performance and increases the localization precision by up to a factor of two. The resolution improvement relies solely on easy-to-fabricate nanocoatings on standard glass coverslips and is spectrally and spatially tunable by the layer design and wavelength, as experimentally demonstrated for dual-color SMLM in cells.
KW  - imaging and sensing
KW  - super-resolution microscopy
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-228080
VL  - 7
ER  - 
TY  - JOUR
A1  - Kreinberg, Sören
A1  - Grbešić, Tomislav
A1  - Strauß, Max
A1  - Carmele, Alexander
A1  - Emmerling, Monika
A1  - Schneider, Christian
A1  - Höfling, Sven
A1  - Porte, Xavier
A1  - Reitzenstein, Stephan
T1  - Quantum-optical spectroscopy of a two-level system using an electrically driven micropillar laser as a resonant excitation source
JF  - Light: Science & Applications
N2  - Two-level emitters are the main building blocks of photonic quantum technologies and are model systems for the exploration of quantum optics in the solid state. Most interesting is the strict resonant excitation of such emitters to control their occupation coherently and to generate close to ideal quantum light, which is of utmost importance for applications in photonic quantum technology. To date, the approaches and experiments in this field have been performed exclusively using bulky lasers, which hinders the application of resonantly driven two-level emitters in compact photonic quantum systems. Here we address this issue and present a concept for a compact resonantly driven single-photon source by performing quantum-optical spectroscopy of a two-level system using a compact high-β microlaser as the excitation source. The two-level system is based on a semiconductor quantum dot (QD), which is excited resonantly by a fiber-coupled electrically driven micropillar laser. We dress the excitonic state of the QD under continuous wave excitation, and trigger the emission of single photons with strong multi-photon suppression (g\(^{(2)}\)(0)=0.02) and high photon indistinguishability (V = 57±9%) via pulsed resonant excitation at 156 MHz. These results clearly demonstrate the high potential of our resonant excitation scheme, which can pave the way for compact electrically driven quantum light sources with excellent quantum properties to enable the implementation of advanced quantum communication protocols.
KW  - near-infrared spectroscopy
KW  - photonic devices
KW  - semiconductor lasers
KW  - single photons and quantum effects
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-229802
VL  - 7
ER  -