Fig. 1: Experimental setup.
From: Ultrasensitive nano-optomechanical force sensor operated at dilution temperatures
a SEM and optical images of the silicon carbide nanowires of large aspect ratios employed in this work. b, c Sketch and image of the experiment mounted on the cold plate of the dilution fridge: the light is fiber guided to the suspended cryogenic experimental platform, and focused on the nanomechanical oscillator under investigation. d Close up of the optical apparatus also showing a fraction of the focused light scattered by the nanowire. e Sketch of the cryogenic interferometric readout. Part of the light is reflected on the output face of the monomode fiber and interfere with the light back-scattered by the nanowire. f Moving the nanowire (2 μm above its vibrating extremity) in the waist area, in the xz horizontal transverse plane, generates a very contrasted reflectivity map, where the phase curvature of the focused laser beam can be clearly identified.
