Figure | Single-photon emission enhancement and single-mode fiber coupling (IMAGE)
Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS
Caption
a, μ-PL spectra of the same QD underneath a Weierstrass SIL (left) and a TIR-SIL (right) and without a lens. Emission characteristics were identified prior to the intensity enhancement evaluation via power-dependent measurements. The insets depict an SEM angular view picture (45° tilt) of the printed lenses. b, (left) Schematic of the fiber chuck design. A TIR-SIL with an NA of 0.001 is printed deterministically aligned on the QD position. After the characterization of the printed lens, the big tube-like chuck is fabricated, being aligned on this lens. On the fiber tip, another lens is printed for coupling the modified emission into the fiber core. The modified fiber is then inserted into the chuck. Epoxy is used to fix the fiber position. Excitation and collection of the QD are carried out via the same fiber. (right) Microscope picture of a fiber inside a fiber chuck. The fiber is stopped via the step indicated by the dashed white lines and is ready for being fixed with epoxy glue. 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). Tilting the filter shifts the wavelength window down to lower wavelengths.
Credit
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
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