title: Broadband circulators based on directional coupling of one-way waveguides.
abstract: Resonator-based optical circulators are fundamentally bandwidth-limited by their quality factors. We propose a new type of circulator based on directional coupling between one-way photonic chiral edge states and conventional two-way waveguides. The operational bandwidth of such circulators is tied to the bandwidth of the directional waveguide coupler and has the potential for simultaneous broadband operation and small device footprint.
authors: Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
authors: Wenjun
authors: W
authors: Qiu
authors: Zheng
authors: Z
authors: Wang
authors: Marin
authors: M
authors: Soljačić