Abstract
We report on a method that allows microscopic image reconstruction from extreme-ultraviolet diffraction patterns without the need for object support constraints or other prior knowledge about the object structure. This is achieved by introducing additional diversity through rotation of an object in a rotationally asymmetric probe beam, produced by the spatial interference between two phase-coherent high-harmonic beams. With this rotational diffractive shearing interferometry method, we demonstrate robust image reconstruction of microscopic objects at wavelengths around 30 nm, using images recorded at only three to five different object rotations.
Highlights
In recent years, coherent diffractive imaging (CDI) has proved to be a versatile imaging technique with many applications, such as high-resolution imaging using X-ray and extreme ultraviolet (XUV) [1,2,3,4] as well as coherent beams of electrons [5] as illumination
We present a novel approach to CDI that enables high-resolution imaging without the need for an object support in the reconstruction algorithm, using only a limited number of measurements with a rotating interference pattern as the probe
We have demonstrated that using rotational diversity in combination with an asymmetric probe beam enables CDI image reconstruction without prior knowledge about the object support, other than that the object is contained within the imaging field-of-view
Summary
Coherent diffractive imaging (CDI) has proved to be a versatile imaging technique with many applications, such as high-resolution imaging using X-ray and extreme ultraviolet (XUV) [1,2,3,4] as well as coherent beams of electrons [5] as illumination. Ptychography uses transverse scanning of a spatially confined probe beam, while maintaining partial overlap between adjacent scan positions This approach introduces additional translational measurement diversity which strongly constrains the exit wave solution. We present a novel approach to CDI that enables high-resolution imaging without the need for an object support in the reconstruction algorithm, using only a limited number of measurements with a rotating interference pattern as the probe. In DSI, the interference between two sheared diffraction patterns is measured through spatially resolved Fourier-transform spectroscopy (FTS) [8] This provides a measure of the phase gradient in the direction of the shear [19]. The experimental results are further supported by numerical simulations, in which the influence of the number of orientations, the relative magnitude of the shear and the signal-to-noise ratio are investigated
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call