title: Shortcuts to adiabaticity in optical waveguides using fast quasiadiabatic dynamics.
abstract: We propose a fast quasiadiabatic approach to the design of optical waveguide devices. This approach distributes the system adiabaticity homogeneously over the device length, thus providing a shortcut to adiabaticity at a shorter device length. A mode sorting asymmetric Y junction is designed by redistributing the adiabaticity of a conventional linearly separating Y junction. Simple procedures for the design of fast quasiadiabatic devices are outlined, and the designed Y junction features large bandwidth at a shorter length than the conventional linearly separating Y junction. The proposed device is verified with beam propagation simulations. A mode conversion efficiency of larger than 99% is observed for the designed Y junction over a 220 nm range.
authors.forename: Sofía
authors.initials: S
authors.lastname: Martínez-Garaot
authors.forename: Juan Gonzalo
authors.initials: JG
authors.lastname: Muga
authors.forename: Shuo-Yen
authors.initials: SY
authors.lastname: Tseng