Frequency manipulation of topological surface states by Weyl phase transitions

By creating a synthetic frequency dimension with dynamic modulation in a 2D honeycomb waveguide array, we construct both Type-I and Type-II Weyl semimetals (WSMs) and utilize the WSM phase transition to control the frequency evolutions of topological surface states. We show that Type-I WSMs and Type-II WSMs manifest opposite and same band slopes for the two surface states, which give rise to the bidirectional and unidirectional frequency shifts, respectively. Moreover, by cascading Type-I Weyl lattices and Type-IIWeyl lattices together, we also achieve the time-reversed evolution of frequency, such as frequency negative refraction, bandwidth expansion-compression, and perfect imaging. The Letter may find applications in robust signal transmission and processing with synthesized topological states. (C) 2021 Optical Society of America.

Automated summary

By creating a synthetic frequency dimension with dynamic modulation in a 2D honeycomb waveguide array, Type-I and Type-II Weyl semimetals are constructed, and the frequency evolutions of topological surface states are controlled. By cascading different types of Weyl lattices, the time-reversed evolution of frequency is achieved, including frequency negative refraction, bandwidth expansion-compression, and perfect imaging.