Spectroscopic imaging with single acquisition ptychography and a hyperspectral detector

Abstract

We present a new method of single acquisition spectroscopic imaging with high spatial resolution. The technique is based on the combination of polychromatic synchrotron radiation and ptychographic imaging with a recently developed energy discriminating detector. We demonstrate the feasibility with a Ni-Cu test sample recorded at I13-1 of the Diamond Light Source, UK. The two elements can be clearly distinguished and the Ni absorption edge is identified. The results prove the feasibility of obtaining high-resolution structural and chemical images within a single acquisition using a polychromatic X-ray beam. The capability of resolving the absorption edge applies to a wide range of research areas, such as magnetic domains imaging and element specific investigations in biological, materials, and earth sciences. The method utilises the full available radiation spectrum and is therefore well suited for broadband radiation sources.

Color ptychography with a hyperspectral x-ray camera

“…1 Our group has furthermore successfully demonstrated a method that uses a hyperspectral detector to capture a hyperspectral dataset of diffraction patterns (diffractograms) in a single ptychographic acquisition. 2 The present article focuses on an improvement on this same method via undulator tapering (see section 2). It also investigates a different sample.…”

New imaging opportunities at the DIAMOND beamline I13L

“…We recently demonstrated the possibility of element specific ptychography from a single scan using the hyperspectral SLcam detector (see figure 2) [15,16]. The device is a pnCCD with 48um side length pixels in a 264x264 array.…”

“…Figure 2: Image series extracted from single ptychographic scan using energy selective SLcam hyper-spectral detector. Test sample consists of a stacked copper and nickel grid, the latter can be identified by its absorption edge [16].…”

The Spectral X-ray Imaging Data Acquisition (SpeXIDAQ) Framework

“…The biggest potential of hyperspectral X-ray sensors is to be found in their ability to bring energy information to the lab, without the non-trivial requirement of tuneable monochromatic X-ray sources. However, even at synchrotron and X-ray free-electron lasers (XFEL) [ 9 ] facilities hyperspectral cameras can be combined with established imaging techniques to enable novel experiments to take place, such as in hyperspectral dark-field X-ray imaging [ 10 ], or hyperspectral ptychographic imaging [ 11 ]. Finally, these hyperspectral systems also provide new diagnostic tools for lab setups and beamlines, offering accurate measurement of source spectra and optics parameters, as demonstrated previously by the authors [ 12 ].…”