title: High efficiency asymmetric directional coupler for slow light slot photonic crystal waveguides.
abstract: An asymmetric directional coupler scheme for the efficient injection of light into slow light slot photonic crystal waveguide modes is proposed and investigated using finite-difference time-domain simulation. Coupling wavelengths can be flexibly controlled by the geometrical parameters of a side-coupled subwavelength corrugated strip waveguide. This approach leads to a ~1dB insertion loss level up to moderately high light group indices (nG≈30) in wavelength ranges of 5-10nm. This work brings new opportunities to inject light into the slow modes of slot photonic crystal waveguides for on-chip communications using hybrid silicon photonics or sensing based on hollow core waveguides.
authors.forename: Yameng
authors.initials: Y
authors.lastname: Xu
authors.forename: Charles
authors.initials: C
authors.lastname: Caer
authors.forename: Dingshan
authors.initials: D
authors.lastname: Gao
authors.forename: Eric
authors.initials: E
authors.lastname: Cassan
authors.forename: Xinliang
authors.initials: X
authors.lastname: Zhang