Plasmonic antennas: precise alignment for high brightness Finding practical ways to control and enhance the emission from single-photon sources is important for applications in quantum optics spanning from fundamental science to quantum information processing. While plasmonic antennas are a solution, the accurate alignment and coupling of such antennas to single-photon emitters like quantum dots, vacancy-centrenanodiamonds and fluorescent molecules is extremely challenging. Laser etching can help ease the task, allowing a CdSe/CdS core-shell quantum dot to be deterministically placed inside a subwavelength plasmonic patch antenna with 3 nm vertical and 50 m lateral precision. Amit Raj Dhawan and coworkers from Chengdu, China and Paris, France, show that the precise control over the location of the emitter results in an emitter-antenna system with a brightness enhancement of a factor of 70 and a large Purcell factor >72.
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