TY  - JOUR
A1  - Beierlein, J.
A1  - Egorov, O. A.
A1  - Harder, T. H.
A1  - Gagel, P.
A1  - Emmerling, M.
A1  - Schneider, C.
A1  - Höfling, S.
A1  - Peschel, U.
A1  - Klembt, S.
T1  - Bloch Oscillations of Hybrid Light‐Matter Particles in a Waveguide Array
JF  - Advanced Optical Materials
N2  - Bloch oscillations are a phenomenon well known from quantum mechanics where electrons in a lattice experience an oscillatory motion in the presence of an electric field gradient. Here, the authors report on Bloch oscillations of hybrid light−matter particles, called exciton‐polaritons (polaritons), being confined in an array of coupled microcavity waveguides. To this end, the waveguide widths and their mutual couplings are carefully designed such that a constant energy gradient is induced perpendicular to the direction of motion of the propagating polaritons. This technique allows us to directly observe and study Bloch oscillations in real‐ and momentum‐space. Furthermore, the experimental findings are supported by numerical simulations based on a modified Gross–Pitaevskii approach. This work provides an important transfer of basic concepts of quantum mechanics to integrated solid state devices, using quantum fluids of light.
KW  - Bloch oscillations
KW  - exciton‐polaritons
KW  - polariton condensation
KW  - waveguides
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-239814
VL  - 9
IS  - 13
ER  - 
TY  - THES
A1  - Then, Patrick
T1  - Waveguide-based single molecule detection in flow
T1  - Wellenleiter-basierte Einzelmoleküldetektion in Strömungen
N2  - In this work fluorescence-based single molecule detection at low concetration is investigated, with an emphasis on the usage of active transport and waveguides.
Active transport allows to overcome the limits of diffusion-based systems in terms of the lowest detectable threshold of concentration.
The effect of flow in single molecule experiments is investigated and a theoretical model is derived for laminar flow. 
Waveguides on the other hand promise compact detection schemes and show great potential for their possible integration into lab-on-a-chip applications. Their properties in single molecule experiments are analyzed with help of a method based on the reciprocity theorem of electromagnetic theory.
N2  - Diese Arbeit untersucht fluoreszenzbasierte Einzelmoleküldetektion bei niedrigen Konzentrationen, mit einem Fokus auf den Einsatz von aktivem Transport und Wellenleitern.
Aktiver Transport ermöglicht es, Limitierungen von diffusionsbasierten Systemen im Hinblick auf die niedrigste erreichbare Konzentration zu überwinden.
Der Einfluss von Strömungen auf Einzelmolekülexperimente wird untersucht und ein theoretisches Modell für laminare Strömungen hergeleitet.
Wellenleiter hingegen versprechen kompakte Detektorsysteme und zeigen beträchtliches Potential für eine mögliche Integration in lab-on-a-chip Anwendungen. Ihre Eigenschaften in Einzelmolekülexperimenten werden mithilfe einer auf dem Reziprozitätstheorem aus der elektromagnetischen Theorie basierenden Methode analysiert.
KW  - Optik
KW  - physics
KW  - optics
KW  - waveguides
Y1  - 2017
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-140548
ER  -