Abstract
We generalize the concept of photonic gauge potential in real space by introducing an additional “synthetic” frequency dimension in addition to the real space dimensions. As an illustration, we consider a one-dimensional array of ring resonators, each supporting a set of resonant modes having a frequency comb with spacing , and undergoing a refractive index modulation at the modulation frequency equal to . We show that the modulation phase provides a gauge potential in the synthetic two-dimensional space with the dimensions being the frequency and the spatial axes. Such a gauge potential can create a topologically protected one-way edge state in the synthetic space that is useful for high-efficiency generation of higher-order side bands.
© 2016 Optical Society of America
Full Article | PDF ArticleMore Like This
Luqi Yuan, Qian Lin, Meng Xiao, and Shanhui Fan
Optica 5(11) 1396-1405 (2018)
Eran Lustig and Mordechai Segev
Adv. Opt. Photon. 13(2) 426-461 (2021)
Luqi Yuan, Avik Dutt, Mingpu Qin, Shanhui Fan, and Xianfeng Chen
Photon. Res. 8(9) B8-B14 (2020)