Speaker
Mrs
Alaleh Aminzadeh
(Department of Chemistry and Physics, La Trobe Institute of Molecular Science, La Trobe University, Victoria 3086, Australia)
Description
There is growing interest in combining soft X-ray ptychography with spectroscopy and applying it to the study of functional materials and biological systems in situ [1-3]. Realising the full potential of this method depends on efficient nanofocusing of the X-ray beam. Fresnel zone plates (FZP) are commonly employed, but their efficiency is typically less than 10% [4]. Achieving higher efficiency generally demands complex nanofabrication strategies that require replacing the radially concentric pattern of opaque and transparent zones with one that approximates a structure with continuous variation in thickness [5].
A linear tilted zone plate (LTZP) design based on a Kinoform optic [6], was optimised for use at the Soft X-ray Imaging (SXRI) beamline of the Australian Synchrotron [7]. The LTZP design aims to produce a continuous modulo 2π phase shift in the illumination using only planar nanofabrication methods. A continuous variation in projected thickness is achieved by tilting a particular planar geometric design with respect to the incident beam. By varying the tilt angle, high efficiency can be achieved over a wide X-ray energy range.
The LTZP was successfully fabricated using electron beam lithography (EBL). Efficiency better than 70% was demonstrated using a photon energy of 320 eV. We will describe the design and fabrication of the LTZP optics and outline the potential improvements to multi-dimensional ptychographic imaging experiments that they can provide. We will also outline plans for further developments that exploit new nanofabrication capabilities based on grey-scale (3D) electron beam lithography and thermal scanning probe lithography.
References:
1. Kourousias, G., et al. Nano Research. 2016, 9 (2046).
2. Jones, M. W. M., et al. Scientific reports. 2016, 6.
3. Wise, Anna M., et al. ACS catalysis. 2016, 6(4), 2178-2181.
4. Di Fabrizio, E., et al. Nature. 1999, 401(6756), 895-898.
5. Wu, SR.,et al. Materials. 2012, 5, 1752-1773.
6. Karvinen, P., et al. Optics express. 2014, 22(14), 16676-16685.
7. van Riessen, GA., et al. SPIE Optical Engineering & Applications. 2013, 885117-885117.
| Are you a student? | Yes |
|---|---|
| Do you wish to take part in</br>the Student Poster Slam? | No |
| What is your gender? | Female |
| Are you an ECR? (<5 yrs</br>since PhD/Masters) | Yes |
Primary author
Mrs
Alaleh Aminzadeh
(Department of Chemistry and Physics, La Trobe Institute of Molecular Science, La Trobe University, Victoria 3086, Australia)
Co-authors
Prof.
Andrew Peele
(ARC Centre of Excellence for Advanced Molecular Imaging, La Trobe University, Victoria 3086, Australia. Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia.)
Mr
Dan Smith
(Melbourne Centre for Nanofabrication, Victoria 3168 Australia)
Dr
Daniel Langley
(. Department of Chemistry and Physics, La Trobe Institute of Molecular Science, La Trobe University, Victoria 3086, Australia. ARC Centre of Excellence for Advanced Molecular Imaging, La Trobe University, Victoria 3086, Australia)
Dr
Fatima Eftekhari
(Melbourne Centre for Nanofabrication, Victoria 3168 Australia)
Dr
Grant van Riessen
(. Department of Chemistry and Physics, La Trobe Institute of Molecular Science, La Trobe University, Victoria 3086, Australia)
Dr
Ricky Tjeung
(. Melbourne Centre for Nanofabrication, Victoria 3168 Australia)
