Spatiotemporal Evolution of Coherent Polariton Modes in ZnO Microwire Cavities at Room Temperature
| Autor: | Tom Michalsky, Rüdiger Schmidt-Grund, Marius Grundmann, Marcel Wille |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
business.industry Mechanical Engineering Physics::Optics Bioengineering 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Ray Interferometry Optics Picosecond 0103 physical sciences Polariton Coherent states General Materials Science Quantum information Whispering-gallery wave 010306 general physics 0210 nano-technology business Coherence (physics) |
| Zdroj: | Nano Letters. 18:6820-6825 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.8b02705 |
| Popis: | Tunable waveguides for propagating coherent quantum states are demanded for future applications in quantum information technology and optical data processing. We present coherent whispering gallery mode polariton states in ZnO-based hexagonal microwires at room temperature. We observed their propagation over the field of view of about 20 μm by picosecond time-resolved real space imaging using a streak camera. Spatial coherence was proven by time integrated Michelson interferometry superimposing the inverted spatial emission pattern with its original one. We furthermore show that the real and momentum space evolution of the coherent states can not only be described by the commonly used model developed for ballistically propagating Bose-Einstein condensates based on the Gross-Pitaevskii equation but equivalently by classical ray optics considering a spatially varying particle density dependent refractive index of the cavity material, not yet considered in literature so far. By changing the excitation spot size, the refractive index gradient and thus the propagation velocity is changed. |
| Databáze: | OpenAIRE |
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