2024/09/19 by M. Sumetsky, Sumetsky, M. · 2 citations
Chemistry · Engineering · #Acoustic Wave Resonator Technologies #FOS: Physical sciences #Optics (physics.optics) #Photoacoustic and Ultrasonic Imaging #Spectroscopy and Laser Applications
paper · pdf · doi:10.48550/arxiv.2409.12775
openalex publication_date 2024/09/19 · openalex created_date 2024/10/25 · openalex updated_date 2026/07/28
The behavior of electromagnetic waves in media modulated in both time and space, extensively studied decades ago, has recently attracted renewed attention. In this work, we address a central question of this research: can light at an initial frequency ω0 be amplified solely by pumping with a traveling wave of much lower frequency ωp ≪ ω0? In general, the bandwidth of the modulation-induced optical frequency-comb spectrum increases substantially when the phase velocity of the traveling wave, vp, approaches the phase velocity of light, v0. However, in realistic photonic waveguides, the resulting amplification remains negligible due to the unfeasible modulation strengths and waveguide parameters required. In contrast, we demonstrate that modulating an optical resonator with a traveling wave of frequency ωp and phase velocity vp much smaller than the frequency ω0 and phase velocity v0 of light can produce strong amplification. This effect is accompanied by conversion into multiple comb lines within a relatively narrow frequency band.