A new mechanism for gain in time dependent media

2020/09/25 by J. B. Pendry, Pendry, J. B., Paloma A. Huidobro +2 · 1 citation
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #FOS: Physical sciences #Mechanical and Optical Resonators #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Optics (physics.optics) #Photonic and Optical Devices

paper · pdf · doi:10.48550/arxiv.2009.12077

openalex publication_date 2020/09/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Time dependent systems do not in general conserve energy invalidating much of the theory developed for static systems and turning our intuition on its head. This is particularly acute in luminal space time crystals where the structure moves at or close to the velocity of light. Conventional Bloch wave theory no longer applies, energy grows exponentially with time, and a new perspective is required to understand the phenomenology. In this letter we identify a new mechanism for amplification: the compression of lines of force that are nevertheless conserved in number.

Citations

• Quantal phase factors accompanying adiabatic changes

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• Broadband amplification of light through adiabatic spatiotemporal modulation

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