2 papers
physics.optics2026
A Unified Perspective on Causality and One-Sided System Responses in Time and Space Across Physical and Fourier Domains
Mohammadreza Salehi, Francesco Monticone
The principle of causality has long been mathematically associated with the frameworks of Titchmarsh's theorem and the Kramers--Kronig relations. While these relations arise natura…
physics.optics2026
Nonlocal photonic time crystals: Infinite momentum bandgaps with minimal modulation speed and strength
Mohammadreza Salehi, Matteo Ciabattoni, Francesco Monticone
For over a decade, photonic time crystals have promised access to novel and exotic optical phenomena, offering fundamentally new ways to manipulate classical and quantum light. Cen…