Tailored optical angle comb under integer constraints in an anisotropic photonic time crystal

This is the authors' abstract. We don't add key points for this paper.

In this Letter, the photonic time crystal (PTC) is employed to achieve multi-channel angle magnification windows (AMWs) in the angular domain, and further to generate an optical angular comb (OAC). Research indicates that the number and height of AMWs can be precisely controlled by adjusting the parameters of the PTC, where the mathematical relationship between the distribution of AMWs and the ratio of refractive index components and phase of the PTC parameters is provided. By changing the time modulation of the PTC's dielectric tensor from a step change to an approximately smooth change, the width characteristics of the AMWs can be flexibly adjusted. The results are verified and compared using the transfer matrix method and the finite-difference time-domain method, confirming the accuracy of the analysis. The proposed OAC has potential application value in fields such as precision angle measurement and spatial light information processing.