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HL: Fachverband Halbleiterphysik

HL 8: Nitrides: Devices

HL 8.1: Vortrag

Montag, 16. März 2020, 09:30–09:45, POT 51

Extreme laser background suppression for resonant fluorescence of a quantum emitter — •Meryem Benelajla^1,2, Elena Kammann¹, and Khaled Karrai¹ — ¹attocube systems AG, Eglfinger Weg 2, 85540 Haar bei München — ²LPCNO INSA CNRS UPS, 135 Av. Rangueil , 31077 Toulouse, France

Semiconductor nanostrustures are promising candidates for developing a broad range of single photon technologies. Relevant demonstrations in this field has been carried out by resonantly coupling a laser beam to a quantum emitter. However, such challenging measurements require the suppression of laser background by several order of magnitudes.One way to do that is to use cross polarization confocal microscopy. Normally, high quality commercial crossed polarizers allows a laser suppression down to 5 to 6 orders of magnitudes. Surprisingly, when used in combination with a confocal microscope, the extinction ratio is boosted up to 9 order of magnitudes. This unexpected but very welcome enhancement finds its origin in the Imbert-Fedorov effect, now commonly referred to as Spin Hall effect of light, which manifests itself in the reflectivity of a Gaussian laser beam off a mirror. In this presentation, we will discuss in details the physics and optics of such a remarkable effect, which we mapped in details for the first time.