Publications (15)
X-ray linear dichroic ptychography
Yuan Hung Lo, Jihan Zhou, Arjun Rana +11
Biominerals such as seashells, corals skeletons, bone, and enamel are optically anisotropic crystalline materials with unique nano- and micro-scale organization that translates int…
Light scattering by a subwavelength plasmonic array: anisotropic model
Anton Nemykin, Leonid Frumin, David Shapiro
We calculate the light transmission by a subwavelength plasmonic array using the boundary element method for parallel cylinders with different cross-sections: circular or elliptic…
Effects of imperfect angular adjustment on plasmonic force
Leonid Frumin, Alexander Tusnin, Oleg Belai +1
The attractive plasmon force between two metallic walls when the electromagnetic wave propagates through a narrow slit has been studied earlier for parallel plates and normal incid…
Advanced Denoising for X-ray Ptychography
Huibin Chang, Pablo Enfedaque, Jie Zhang +7
The success of ptychographic imaging experiments strongly depends on achieving high signal-to-noise ratio. This is particularly important in nanoscale imaging experiments when diff…
Light Scattering on Two Parallel Subwavelength Cylinders
Alex Verevkin, Alex Bereza, David Shapiro
The plasmon resonance has found important application in various systems, e.g., nanoantennas, solar panels, refractive index sensors. Unfortunately, a few analytical solutions for…
Chiral effects at the metal center in Fe(III) spin crossover coordination salts
M Zaid Zaz, Wai Kiat Chin, Gauthami Viswan +8
Evidence of chirality was observed at the Fe metal center in Fe(III) spin crossover coordination salts [Fe(qsal)2][ Ni(dmit)2] and [Fe(qsal)2](TCNQ)2 from X-ray absorption spectros…
Conceptual Framework for Autonomous Cognitive Entities
David Shapiro, Wangfan Li, Manuel Delaflor +1
The rapid development and adoption of Generative AI (GAI) technology in the form of chatbots such as ChatGPT and Claude has greatly increased interest in agentic machines. This pap…
Modeling of Subwavelength Gratings: Near-Field Behavior
Alexander Chernyavsky, Alexey Bereza, Leonid Frumin +1
Subwavelength gratings, with period shorter than the incident wavelength, have garnered significant attention in the fields of photonics, optoelectronics, and image sensor technolo…
Machine Learning-Augmented Acceleration of Iterative Ptychographic Reconstruction
Bowen Zheng, Katayun Kamdin, David Shapiro +10
Iterative ptychographic reconstruction algorithms are widely used for coherent diffractive imaging but can exhibit slow convergence under realistic experimental conditions. We prop…
Bringing Impressionism to Life with Neural Style Transfer in Come Swim
Bhautik Joshi, Kristen Stewart, David Shapiro
Neural Style Transfer is a striking, recently-developed technique that uses neural networks to artistically redraw an image in the style of a source style image. This paper explore…
Contrast-invariant deep ptychography neural networks
Albert Vong, Steven Henke, Oliver Hoidn +6
Ptychography neural networks suffer from scaling inconsistencies when generalizing out of distribution, limiting their real world viability. We address this scaling mismatch using…
Differential electron yield imaging with STXM
William A. Hubbard, Jared J. Lodico, Xin Yi Ling +4
Total electron yield (TEY) imaging is an established scanning transmission X-ray microscopy (STXM) technique that gives varying contrast based on a sample's geometry, elemental com…
Towards generalizable deep ptychography neural networks
Albert Vong, Steven Henke, Oliver Hoidn +8
X-ray ptychography is a data-intensive imaging technique expected to become ubiquitous at next-generation light sources delivering many-fold increases in coherent flux. The need fo…
Operando spectro-ptychography reveals dynamical charge-storage and degradation pathways in redox-active electrodes
Xiao Zhao, Yuchen Cao, Evan Z Carlson +13
Electrochemical reactions at buried electrode-electrolyte interfaces govern how redox-active materials store and release energy. However, these reactions are difficult to visualize…
Correlative cellular ptychography with functionalized nanoparticles at the Fe L-edge
Marcus Gallagher-Jones, Carlos Sato Baraldi-Dias, Alan Pryor +7
Precise localization of nanoparticles within a cell is crucial to the understanding of cell-particle interactions and has broad applications in nanomedicine. Here, we report a proo…