Single-photon emission from semiconductor quantum dots (QDs) has been shown to be a pure and efficient non-classical light source with a high degree of indistinguishability. In order to achieve the challenging and long-standing goal to make secure, wide-spread quantum communication networks a reality, high-brightness single-photon sources are indispensable. Quantum computing and quantum communication are believed to be the future of information technology. view moreĬredit: by Marc Sartison, Ksenia Weber, Simon Thiele, Lucas Bremer, Sarah Fischbach, Thomas Herzog, Sascha Kolatschek, Michael Jetter, Stephan Reitzenstein, Alois Herkommer, Peter Michler, Simone Luca Portalupi, and Harald Giessen Tilting the filter shifts the wavelength window down to lower wavelengths. c, Unfiltered PL signal of the standalone QD device (left) and spectrum filtered with a band-pass filter that is designed for 885?nm?±?12.5?nm (right). The fiber is stopped via the step indicated by the dashed white lines and is ready for being fixed with epoxy glue. (right) Microscope picture of a fiber inside a fiber chuck. Excitation and collection of the QD are carried out via the same fiber. The modified fiber is then inserted into the chuck. On the fiber tip, another lens is printed for coupling the modified emission into the fiber core. After the characterization of the printed lens, the big tube-like chuck is fabricated, being aligned on this lens. A TIR-SIL with an NA of 0.001 is printed deterministically aligned on the QD position. b, (left) Schematic of the fiber chuck design. The insets depict an SEM angular view picture (45° tilt) of the printed lenses. Emission characteristics were identified prior to the intensity enhancement evaluation via power-dependent measurements. Image: a, μ -PL spectra of the same QD underneath a Weierstrass SIL (left) and a TIR-SIL (right) and without a lens.
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