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The efficient excitation of quantum sources such as quantum dots or singlemolecules requires high NA optics which is often a challenge in cryogenics, orin ultrafast optics. Here we propose a 3.2 um wide parabolic mirror, with a 0.8um focal length, fabricated by direct laser writing on CdSe/CdS colloidalquantum dots, capable of focusing the excitation light to a sub-wavelength spotand to extract the generated emission by collimating it into a narrow beam.This mirror is fabricated via in-situ volumetric optical lithography, which canbe aligned to individual emitters, and it can be easily adapted to othergeometries beyond the paraboloid. This compact solid-state transducer fromfar-field to the emitter has important applications in objective-free quantumtechnologies.

Objective-free excitation of quantum emitters with a laser-written micro parabolic mirror