Promotionsvortrag Physik: Enhancing x-ray diffractive imaging and optical microscopy by use of intensity correlations

Apr 29
April 29, 2019 3:30 pm - 4:30 pm
Raum SRLP 0.179, LS für Laserphysik, Staudtstraße 1, Erlangen

Einladung zum Promotionsvortrag von Herrn Anton Claasen:
„Enhancing x-ray diffractive imaging and optical microscopy by use of intensity correlations“

In this thesis we propose intensity correlation enhanced imaging techniques in two major areas of imaging with light. The first area is diffractive imaging. Based on the measurements of higher-order intensity correlation functions of incoherent light fields, and a specific detection strategy, superresolving imaging of arbitrary 1D and 2D arrays of thermal light sources, in the optical and in the XUV regime, can be achieved. We further propose to use intensity correlations of incoherent x-ray fluorescence to reach atomic resolution via a technique we call incoherent diffractive imaging (IDI). We present the theory and discuss a number of properties which are conceptually superior or complementary to coherent methods. IDI may thus open new strategies for x-ray structure determination. The second area is superresolution microscopy. Intensity correlation microscopy (ICM) can be used to achieve superresolution via an auto-correlation analysis. Structured illumination microscopy (SIM) is an alternative method to reach the same goal. We propose to fruitfully combine ICM and SIM, resulting in structured illumination intensity correlation microscopy (SI-ICM). SI-ICM enhances both the lateral and axial resolution further, resulting in full 3D superresolution. We present the theory and simulations, which verify the theoretical predictions. Since SI-ICM is applicable in the linear regime, it is especially interesting for biological imaging. (Vortrag auf Englisch)

Dem Vortrag schließt sich eine Diskussion von 15 Minuten an. Vortrag und Diskussion sind öffentlich. Diesen Verfahrensteilen folgt ein nicht öffentliches Rigorosum von 45 Minuten.