Inverse design of arbitrary optical helicity patterns

On the Inverse Cascade of Magnetic Helicity

Q1 We study the inverse cascade of magnetic helicity in conducting fluids, as pertinent to the generation and dynamics of magnetic fields as observed, e.g., in the solar corona, by investigating the detailed transfer of helicity between different spherical shells in Fourier space in direct numerical simulations of three-dimensional magnetohydrodynamics (MHD). Two different numerical simulations...

Computational inverse design of non-intuitive illumination patterns to maximize optical force or torque.

This paper aims to maximize optical force or torque on arbitrary micro- and nanoscale objects using numerically optimized structured illumination. By developing a numerical framework for computer-automated design of 3d vector-field illumination, we demonstrate a 20-fold enhancement in optical torque per intensity over circularly polarized plane wave on a model plasmonic particle. The nonconvex ...

Quantum-interferometric optical lithography: Towards arbitrary two-dimensional patterns

Optical lithography is a widely used printing method. In this process, light is used to etch a substrate. The exposed or unexposed areas on the substrate then define the pattern. In particular, the microchip industry uses lithography to produce smaller and smaller processors. However, classical optical lithography can only achieve a resolution comparable to the wave length of the light used @1–...

Inverse Design of Dispersion Compensating Optical Fibres Using Topology Optimization

Inverse cascade of magnetic helicity in magnetohydrodynamic turbulence.

The nonlinear dynamics of magnetic helicity HM, which is responsible for large-scale magnetic structure formation in electrically conducting turbulent media, is investigated in forced and decaying three-dimensional magnetohydrodynamic turbulence. This is done with the help of high-resolution direct numerical simulations and statistical closure theory. The numerically observed spectral scaling o...