2 papers
physics.optics2026
Bound states in the continuum in multilayered time-varying metasurfaces
Puneet Garg, Michael Plum, Carsten Rockstuhl
Time-varying metamaterials involve a rapid temporal modulation of the permittivity, often at frequencies comparable to the oscillation frequency of light. However, pronounced physi…
math.NA2025
A Two-Stage Finite Element Approach for High-precision Guaranteed Lower Eigenvalue Bounds
Xuefeng Liu, Michael Plum
Obtaining high-precision guaranteed lower eigenvalue bounds remains difficult, even though the standard high-order conforming finite element (FEM) easily yields extremely sharp upp…