Supporting material
نویسندگان
چکیده
The multiangle 3D cross-correlation instrument is a high precision optical instrument. It requires precise alignment of the mechanical and optical components. In particular it has be assured that both laser beams are focused into the same scattering volume and that the pair of detectors which is placed at a particular angle detects light scattered in this volume at exactly the same q-vector. In this case it is not sufficient to detect at the same angle, i.e. the same norm of the q-vector. Also the orientations of the two detectors have to coincide. It is only under these strict conditions that a correlated signal will be detected in the cross correlation function. For the multiangle instrument this means that two illuminating laser beams and 8 detector “beams” must intersect in a volume smaller than 100μm in well defined orientations. Every small deviation leads to a reduction in the degree of correlation that results in a reduction of the intercept. Once the deviations are too large either in orientation or overlap volume, no correlation between the two signals is detected any more. Due to the large number of degrees of freedom of the alignment (tilt and translation of fibers, lasers, and lenses) it is practically impossible to find a correlated signal by unsystematically turning one screw after the other. Therefore a robust alignment procedure that results in at least some correlation has
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