Dr Andrew Maiden
PhD, MEng
School of Electrical and Electronic Engineering
Director of Programme Delivery
Senior Lecturer Computational Holography
Semiconductor Materials and Devices Research Group
a.maiden@sheffield.ac.uk
+44 114 222 5181
+44 114 222 5181
Sir Frederick Mappin Building
Full contact details
Dr Andrew Maiden
School of Electrical and Electronic Engineering
Sir Frederick Mappin Building
Mappin Street
Sheffield
S1 3JD
School of Electrical and Electronic Engineering
Sir Frederick Mappin Building
Mappin Street
Sheffield
S1 3JD
- Profile
-
I’m interested in computational optics – enhancing optical systems such as microscopes, cameras or projectors with computer code.
My interest began with my PhD at Durham University, where I used computer modelling of the way light propagates to design digital holograms.
The holograms were printed out and projected a 3D pattern of circuitry when illuminated with a laser. We used these projected patterns to expose photoresist for the manufacture of volumetric integrated circuits and 3D antennas.
I spent a year living in the Lake District (where I grew up) after my PhD. I got to indulge my passion for outdoor sports – rock climbing, fell running and triathlon – whilst I was there, so when I decided to return to academia Sheffield was a natural choice, being a very outdoors city with excellent Universities.
I moved to Sheffield to work with Professor John Rodenburg and was lucky enough to join him in the pioneering days of a computational optics technique called ptychography (pronounced tie-cog- ra-fee).
Ptychography uses diffraction pattern measurements to enhance microscopes. It realises ‘perfect’ imaging, where the image of a microscopic specimen it recreates is an exact copy of how that specimen interacts with a beam of light.
I left Sheffield University for a brief spell to work with a spin-out company on commercialisation of ptychography-enhanced microscopes. I missed the freedom of the academic environment, and returned as a Lecturer after a couple of years.
As well as my continuing research in computational optics, I now teach analogue electronics to our third years.
- Qualifications
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- PhD, University of Durham 2005
- MEng (Electronic & Electrical Engineering), University of Birmingham 2001
- Research interests
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- Coherent Diffractive Imaging (CDI)
- Ptychography
- Computer-generated holography
- Phase imaging in the Transmission Electron Microscope (TEM)
- Inverse problems
- Image processing
- Publications
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Journal articles
- Assessing Ptychographic Methods for Maximum Low Dose Performance. BIO Web of Conferences, 129, 04034-04034.
- Computational optical sectioning via near-field multi-slice ptychography. Optics Letters, 49(17), 4839-4839.
- Comparing Ptychographic Methods for Maximum Low Dose Performance. Microscopy and Microanalysis, 30(Supplement_1).
- WASP: weighted average of sequential projections for ptychographic phase retrieval. Optics Express, 32(12), 21327-21327.
- Lorentz near-field electron ptychography. Applied Physics Letters, 123(19).
- Near-field multi-slice ptychography: quantitative phase imaging of optically thick samples with visible light and X-rays. Optics Express, 31(10), 15791-15791.
- Ptycho-cam: a ptychographic phase imaging add-on for optical
microscopy. Applied Optics, 61(10), 2874-2874.
- Single-pixel ptychography. Optics Letters, 46(7), 1624-1624.
- Efficient large field of view electron phase imaging using near-field electron ptychography with a diffuser. Ultramicroscopy. View this article in WRRO
- Near-field ptychographic microscope for quantitative phase imaging. Optics Express, 26(19), 25471-25480. View this article in WRRO
- Image feature delocalization in defocused probe electron ptychography. Ultramicroscopy, 187, 71-83. View this article in WRRO
- Lensless LED matrix ptychographic microscope: problems and solutions. Applied Optics, 57(8), 1800-1806. View this article in WRRO
- Multi-slice ptychographic tomography. Scientific Reports, 8(1). View this article in WRRO
- Ten implementations of ptychography.. Journal of Microscopy. View this article in WRRO
- Further improvements to the ptychographical iterative engine. Optica, 4(7), 736-745. View this article in WRRO
- Characterizing a spatial light modulator using ptychography. Optics Letters, 42(3), 371-374. View this article in WRRO
- Modal decomposition of a propagating matter wave via electron ptychography. Physical Review A, 94. View this article in WRRO
- Low-Frequency Response of Ptychography in the TEM.. Microscopy and Microanalysis, 22(S3), 510-511.
- Breaking ambiguities in mixed state ptychography. Optics Express, 24(8), 9038-9038. View this article in WRRO
- Quantitative electron phase imaging with high sensitivity and an unlimited field of view. Scientific Reports, 5. View this article in WRRO
- Ptychographic microscope for three-dimensional imaging. Optics Express, 22(10), 12513-12523.
- Sampling in x-ray ptychography. Physical Review A - Atomic, Molecular, and Optical Physics, 87(5).
- Soft X-ray spectromicroscopy using ptychography with randomly phased illumination.. Nat Commun, 4, 1669.
- The influence of sphere power and lens design on the oxygen transmissibility of current soft toric silicone hydrogel lenses. Contact Lens and Anterior Eye, 35, e20-e20.
- An annealing algorithm to correct positioning errors in ptychography.. Ultramicroscopy, 120, 64-72.
- Quantitative phase contrast optimised cancerous cell differentiation via ptychography.. Opt Express, 20(9), 9911-9918.
- Ptychographic electron microscopy using high-angle dark-field scattering for sub-nanometre resolution imaging.. Nat Commun, 3, 730. View this article in WRRO
- Electron Ptychography: Applications Of The Electron Wave Phase. Microscopy and Microanalysis, 18(S2), 502-503.
- Atomic resolution transmission imaging at 30keV via electron ptychography. Microscopy and Microanalysis, 18(S2), 1024-1025.
- Ptychographic transmission microscopy in three dimensions using a multi-slice approach. Journal of the Optical Society of America A: Optics and Image Science, and Vision, 29(8), 1606-1614.
- Ptychography: A powerful phase retrieval technique for biomedical imaging. Proceedings of SPIE - The International Society for Optical Engineering, 8338.
- Transmission Diffractive Microscopy Without Lenses at Visible, X-ray and Electron Wavelengths. Microscopy and Microanalysis, 17(S2), 1058-1059.
- Superresolution imaging via ptychography.. J Opt Soc Am A Opt Image Sci Vis, 28(4), 604-612.
- Extended ptychography in the transmission electron microscope: possibilities and limitations.. Ultramicroscopy, 111(8), 1117-1123.
- Ptychography: A novel phase retrieval technique, advantages and its application. Proceedings of SPIE - The International Society for Optical Engineering, 8001.
- Wave-front phase retrieval in transmission electron microscopy via ptychography. PHYS REV B, 82(12).
- Optical ptychography: a practical implementation with useful resolution.. Opt Lett, 35(15), 2585-2587.
- Quantitative Phase Retrieval by Ptychography in TEM. Microscopy and Microanalysis, 16(S2), 748-749.
- High resolution transmission imaging without lenses. Journal of Physics: Conference Series, 241.
- A new method of high resolution, quantitative phase scanning microscopy. Proceedings of SPIE - The International Society for Optical Engineering, 7729.
- An improved ptychographical phase retrieval algorithm for diffractive imaging.. Ultramicroscopy, 109(10), 1256-1262.
- Photolithographic patterning of bihelical tracks onto conical substrates. J MICRO-NANOLITH MEM, 6(4).
- Nonplanar photolithography with computer-generated holograms.. Opt Lett, 30(11), 1300-1302.
- Non-planar interconnect. Circuit World, 31(2), 10-14.
- Ptycho-endoscopy on a lensless ultrathin fiber bundle tip. Light: Science & Applications, 13(1).
- Spatial- and Fourier-domain ptychography for high-throughput bio-imaging. Nature Protocols.
Chapters
- Ptychography, Springer Handbook of Microscopy (pp. 819-904). Springer International Publishing View this article in WRRO
- Defocus and probe-position coupling in electron ptychography (pp. 475-476). Wiley-VCH Verlag GmbH & Co. KGaA
Conference proceedings papers
- Near-field multi-slice optical ptychography. Optica Imaging Congress 2024 (3D, AOMS, COSI, ISA, pcAOP), Vol. 29 (pp CW3B.1-CW3B.1), 2024.
- A comparison of ptychographic phase retrieval algorithms. Quantitative Phase Imaging V, 2 February 2019 - 7 February 2019.
- Optical ptychography with extended depth of field. Journal of Physics: Conference Series, Vol. 902 (pp 012015-012015) View this article in WRRO
- Ptychography for strongly scattering 3D objects. Optics in the Life Sciences Congress, 2017.
- OPTICAL ARRANGEMENTS FOR PHASE-SENSITIVE IMAGING USING ELECTRON PTYCHOGRAPHY. RECENT TRENDS IN CHARGED PARTICLE OPTICS AND SURFACE PHYSICS INSTRUMENTATION (pp 60-61)
- The Remarkably Flexible Ptychographic Data Set. Optics InfoBase Conference Papers
- Super-resolved Ptychographic Imaging. Microscopy and Microanalysis, Vol. 20(S3) (pp 372-373)
- Three-dimensional Ptychography. Classical Optics 2014, 2014.
- TRANSMISSION AND REFLECTION MICROSCOPY WITHOUT LENSES. RECENT TRENDS IN CHARGED PARTICLE OPTICS AND SURFACE PHYSICS INSTRUMENTATION (pp 61-62)
- A photolithographic process for grossly non-planar substrates - art. no. 69212E. EMERGING LITHOGRAPHIC TECHNOLOGIES XII, PTS 1 AND 2, Vol. 6921 (pp E9212-E9212)
- Non-planar photolithography using digital holograms. Optics InfoBase Conference Papers
- Photolithography on three dimensional substrates. Proceedings - Electronic Components and Technology Conference, Vol. 2006 (pp 283-288)
- Photolithography on grossly non-planar substrates. Proceedings of the Seventh IEEE CPMT Conference on High Density Microsystem Design, Packaging and Failure Analysis (HDP'05) (pp 442-446)
Patents
- Calibration of a probe in ptychography. US8942449 (US). Appl. 27 Jan 2015.
- Provision of image data. US8908910 Appl. 09 Dec 2014.
- Method and apparatus for providing image data. US8917393 Appl. 23 Dec 2014.
- Holographic Lithography. GB2419501 (UK). Appl. 01 Jan 1970.
Preprints
- Ptycho-endoscopy on a lensless ultrathin fiber bundle tip, arXiv.
- Set projection algorithms for blind ptychographic phase retrieval, arXiv.
- Magnetic Phase Imaging using Lorentz Near-field Electron Ptychography, arXiv.
- Single-pixel coherent diffraction imaging, arXiv.
- Modal decomposition of a propagating matter wave via electron ptychography, arXiv.
- Assessing Ptychographic Methods for Maximum Low Dose Performance. BIO Web of Conferences, 129, 04034-04034.
- Teaching activities
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- EE335 (integrated electronics)
- EEE6231 (optical imaging systems)
- Postgraduate Research Admissions Tutor
- Research students
Student Degree Status Primary/Secondary Cao S PhD Graduated Secondary