title: Short and robust directional couplers designed by shortcuts to adiabaticity.
abstract: We propose short and robust directional couplers designed by shortcuts to adiabaticity, based on Lewis-Riesenfeld invariant theory. The design of directional couplers is discussed by combining invariant-based inverse engineering and perturbation theory. The error sensitivity of the coupler is minimized by optimizing the evolution of dynamical invariant with respect to coupling coefficient/input wavelength variations. The proposed robust coupler devices are verified with beam propagation simulations.
authors.forename: Shuo-Yen
authors.initials: SY
authors.lastname: Tseng
authors.forename: Rui-Dan
authors.initials: RD
authors.lastname: Wen
authors.forename: Ying-Feng
authors.initials: YF
authors.lastname: Chiu
authors.forename: Xi
authors.initials: X
authors.lastname: Chen