296 citations · 526 across the 13 of their papers we have counts for
13 papers
Extending the Takagi-Taupin equations for x-ray nanobeam Bragg coherent diffraction
T. Zhou, M. J. Cherukara, S. Kandel +7
We present a new approach for simulating x-ray nanobeam Bragg coherent diffraction patterns based on the Takagi-Taupin equations. Compared to conventional methods, the current appr…
Imaging extended single crystal lattice distortion fields with multi-peak Bragg ptychography
Saugat Kandel, Siddharth Maddali, Marc Allain +4
We describe a phase-retrieval-based imaging method to directly spatially resolve the vector lattice distortions in an extended crystalline sample by explicit coupling of independen…
AI-enabled Lorentz microscopy for quantitative imaging of nanoscale magnetic spin textures
Arthur R. C. McCray, Tao Zhou, Saugat Kandel +3
The manipulation and control of nanoscale magnetic spin textures is of rising interest as they are potential foundational units in next-generation computing paradigms. Achieving th…
AI-assisted Automated Workflow for Real-time X-ray Ptychography Data Analysis via Federated Resources
Anakha V Babu, Tekin Bicer, Saugat Kandel +7
We present an end-to-end automated workflow that uses large-scale remote compute resources and an embedded GPU platform at the edge to enable AI/ML-accelerated real-time analysis o…
Demonstration of an AI-driven workflow for autonomous high-resolution scanning microscopy
Saugat Kandel, Tao Zhou, Anakha V Babu +7
With the continuing advances in scientific instrumentation, scanning microscopes are now able to image physical systems with up to sub-atomic-level spatial resolutions and sub-pico…
Deep learning at the edge enables real-time streaming ptychographic imaging
Anakha V Babu, Tao Zhou, Saugat Kandel +15
Coherent microscopy techniques provide an unparalleled multi-scale view of materials across scientific and technological fields, from structural materials to quantum devices, from…
A differentiable forward model for the concurrent, multi-peak Bragg coherent x-ray diffraction imaging problem
S. Maddali, T. D. Frazer, N. Delegan +12
We present a general analytic approach to spatially resolve the nano-scale lattice distortion field of strained and defected compact crystals with Bragg coherent x-ray diffraction…
A matrix-free Levenberg-Marquardt algorithm for efficient ptychographic phase retrieval
Saugat Kandel, S. Maddali, Youssef S G Nashed +3
The phase retrieval problem, where one aims to recover a complex-valued image from far-field intensity measurements, is a classic problem encountered in a range of imaging applicat…
Adorym: A multi-platform generic x-ray image reconstruction framework based on automatic differentiation
Ming Du, Saugat Kandel, Junjing Deng +7
We describe and demonstrate an optimization-based x-ray image reconstruction framework called Adorym. Our framework provides a generic forward model, allowing one code framework to…
Real-time 3D Nanoscale Coherent Imaging via Physics-aware Deep Learning
Henry Chan, Youssef S. G. Nashed, Saugat Kandel +4
Phase retrieval, the problem of recovering lost phase information from measured intensity alone, is an inverse problem that is widely faced in various imaging modalities ranging fr…
Three dimensions, two microscopes, one code: automatic differentiation for x-ray nanotomography beyond the depth of focus limit
Ming Du, Youssef S. G. Nashed, Saugat Kandel +2
Conventional tomographic reconstruction algorithms assume that one has obtained pure projection images, involving no within-specimen diffraction effects nor multiple scattering. Ad…
Using Automatic Differentiation as a General Framework for Ptychographic Reconstruction
Saugat Kandel, S. Maddali, Marc Allain +3
Coherent diffraction imaging methods enable imaging beyond lens-imposed resolution limits. In these methods, the object can be recovered by minimizing an error metric that quantifi…
Observation of Dirac Monopoles in a Synthetic Magnetic Field
M. W. Ray, E. Ruokokoski, S. Kandel +2
Magnetic monopoles --- particles that behave as isolated north or south magnetic poles --- have been the subject of speculation since the first detailed observations of magnetism s…