Ptychographic Nano-Analytical Microscope (PtyNAMi) at PETRA III: signal-to-background optimization for imaging with high sensitivity

Abstract

The X-ray scanning microscope PtyNAMi at beamline P06 of PETRA III at DESY in Hamburg, Germany, is designed for high-spatial-resolution 3D imaging with high sensitivity. Besides optimizing the coherent flux density on the sample and the precision mechanics of the scanner, special care has been taken to reduce background signals on the detector. The optical path behind the sample is evacuated up until the sensor of a four-megapixel detector that is placed into the vacuum. In this way, parasitic scattering from air and windows close to the detector is avoided. The instrument has been commissioned and is in user operation. The main commissioning results of the low-background detector system are presented. A signal-to-noise model for small object details is derived that includes incoherent background scattering.

Four-Fold Multi-Modal X-ray Microscopy Measurements of a Cu(In,Ga)Se2 Solar Cell

“…Ptychography: An area detector (Eiger X 4M, Dectris, Baden-Daettwil, Switzerland) was placed m downstream of the sample, in the experimental nanoprobe hutch of beamline P06 [ 35 ], to measure the far-field diffraction patterns. The detector was set up in vacuum ( ) with a flight tube to minimize the air path between sample and detector [ 36 ].…”

Multi-slice ptychography enables high-resolution measurements in extended chemical reactors

“…Experiment: single polyimide foil. The experiment was performed at the hard X-ray nanoprobe station PtyNAMi of beamline P06 at the synchrotron radiation source PETRA III (Hamburg, Germany) 44,45 . The polyimide foil with the copper(I) oxide particles on both sides was glued to a thin silicon frame, covering a hole of 10 mm diameter.…”

“…Experiment: chemical reactor. The experiment was again performed at the hard X-ray nanoprobe station PtyNAMi of beamline P06 at the synchrotron radiation source PETRA III (Hamburg, Germany) 44,45 . The whole chemical reactor with all connections needed to potentially operated it, was placed inside the PtyNAMi setup 46,47 .…”

X-ray-Based Techniques to Study the Nano–Bio Interface

“…Imaging ( i . e ., spatial resolution) (see Figure a) based on X-ray transmission, fluorescence, (coherent) scattering, diffraction, or phase contrast techniques has been demonstrated using synchrotron radiation. ,,,− Furthermore, recently developed nanoprobe beamlines − , possess advanced X-ray optics which are capable of focusing synchrotron radiation below 50 nm, allowing the use of X-ray imaging techniques to study biological samples with subcellular resolution.…”