Nathaniel Morrison
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View article: Efficiency of machine learning optimizers and meta-optimization for nanophotonic inverse design tasks
Efficiency of machine learning optimizers and meta-optimization for nanophotonic inverse design tasks Open
The success of deep learning has driven the proliferation and refinement of numerous non-convex optimization algorithms. Despite this growing array of options, the field of nanophotonic inverse design continues to rely heavily on quasi-New…
View article: Coherent spin wave excitation with radio-frequency spin–orbit torque
Coherent spin wave excitation with radio-frequency spin–orbit torque Open
Spin waves, collective perturbations of magnetic moments, are both fundamental probes for magnetic physics and promising candidates for energy-efficient signal processing and computation. Traditionally, coherent propagating spin waves have…
View article: Physics-agnostic inverse design using transfer matrices
Physics-agnostic inverse design using transfer matrices Open
Inverse design is an application of machine learning to device design, giving the computer maximal latitude in generating novel structures, learning from their performance, and optimizing them to suit the designer’s needs. Gradient-based o…
View article: Linear Polycatenanes from Kinetoplast Edge Loops
Linear Polycatenanes from Kinetoplast Edge Loops Open
We use graph theory simulations and single molecule experiments to investigate percolation properties of kinetoplasts, the topologically linked mitochondrial DNA from trypanosome parasites. The edges of some kinetoplast networks contain a …
View article: Circuit-level design principles for transmission-mode microwave impedance microscopy
Circuit-level design principles for transmission-mode microwave impedance microscopy Open
A recently developed technique of transmission-mode microwave impedance microscopy (T-MIM) has greatly extended the capabilities of standard reflection-mode MIM to novel applications, such as the in operando study of nanoscale electro-acou…
View article: Coxeter quotients of knot groups through 16 crossings
Coxeter quotients of knot groups through 16 crossings Open
We find explicit maximal rank Coxeter quotients for the knot groups of 595,515 out of the 1,701,936 knots through 16 crossings. We thus calculate the bridge numbers and verify Cappell and Shaneson's Meridional Rank Conjecture for these kno…