Photonic waveguides (IMAGE)
Caption
A focused laserbeam (left, blue) generates single photos by a single quantum dot inside the photonic waveguides (red), which are fabricated on top of crystalline gallium arsenide- (GaAs-) aluminium gallium arsenide (Al0.2Ga0.8As).Two interdigitating electrodes (interdigital transducers, IDT) generate nanoscale soundwaves (surface acoustic waves, SAWs), which dynamically strain the waveguides. The nanoscale soundwave generated by the left IDT switches the color of the emitted single photons. The two waveguides are coupled by two so-called multimode interference beamsplitters (MMIs). The soundwave generated by the right IDT sorts the single photons according to their colour (red and green) between the two outputs on the right.
Credit
Dominik Bühler
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