Table-Top Water-Window Microscope Using a Capillary Discharge Plasma Source with Spatial Resolution 75 nm

Applied Sciences

Dalibor Pánek¹  Miroslava Vrbová¹  Tomáš Parkman¹  Jana Turňová¹  Michal Nevrkla²  Alexandr Jančárek² 

[1] Faculty of Biomedical Engineering, Czech Technical University in Prague, nam. Sitna 3105, 27201 Kladno, Czech Republic;Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehova 7, 11519 Prague 1, Czech Republic;

关键词: SXR microscopy;    water window;    Z-pinch;    discharge source;    Fresnel zone plate;    imaging;   

DOI  :  10.3390/app10186373

来源: DOAJ

【 摘 要 】

We present a design of a compact transmission water-window microscope based on the Z-pinching capillary discharge nitrogen plasma source. The microscope operates at wavelength of 2.88 nm (430 eV), and with its table-top dimensions provides an alternative to large-scale soft X-ray (SXR) microscope systems based on synchrotrons and free-electron lasers. The emitted soft X-ray radiation is filtered by a titanium foil and focused by an ellipsoidal condenser mirror into the sample plane. A Fresnel zone plate was used to create a transmission image of the sample onto a charge-coupled device (CCD) camera. To assess the resolution of the microscope, we imaged a standard sample-copper mesh. The spatial resolution of the microscope is 75 nm at half-pitch, calculated via a 10–90% intensity knife-edge test. The applicability of the microscope is demonstrated by the imaging of green algae-Desmodesmus communis. This paper describes the principle of capillary discharge source, design of the microscope, and experimental imaging results of Cu mesh and biological sample.

【 授权许可】

Unknown