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physics.acc-ph2024
Fundamental Limits on Fiber-Based Electron Acceleration and How to Overcome Them
Aku Antikainen, Siddharth Ramachandran
To accelerate ultra-relativistic charged particles, such as electrons, using an electromagnetic pulse along a hollow-core waveguide, the pulse needs to have a longitudinal electric…
physics.optics2024
Analytical Expressions for Effective Indices of Modes of Optical Fibers Near and Beyond Cutoff
Aku Antikainen, Robert W. Boyd
We derive an analytical expression for the effective indices of modes of circular step-index fibers valid near their cutoff wavelengths. The approximation, being a first-order Tayl…