Geometrical representation of coherent tunneling process in two-waveguide and three-waveguide coupler<xref rid="cpb_26_12_124214fn1" ref-type="fn">*</xref> <fn id="cpb_26_12_124214fn1"> <label>*</label> <p>Project supported by the National Natural Science Foundation of China (Grant Nos. 11304247 and 61505161) and the Shaanxi Provincial Research Plan for Young Scientific and Technological New Stars, China (Grant No. 2015KJXX-40).</p> </fn>

Geometrical representation of coherent tunneling process in two-waveguide and three-waveguide coupler* *

Project supported by the National Natural Science Foundation of China (Grant Nos. 11304247 and 61505161) and the Shaanxi Provincial Research Plan for Young Scientific and Technological New Stars, China (Grant No. 2015KJXX-40).

Shi Jian^†, Ma Rui-Qiong, Duan Zuo-Liang, Liang Meng, Chai Bao-Yu, Dong Jun

(color online) Geometrical visualizations of STIRAP in three-waveguide directional couplers: (a) full efficiency STIRAP, (b) fractional efficiency STIRAP, (c) zero efficiency STIRAP, and (d) non-adiabatic passage. In all of these schemes, the light is coupled into the left waveguide, and the selected adiabatic tunneling rate parameters are the same as those in Ref. [13]. While in non-adiabatic scheme, the parameters are z_R = 30.5 mm, z_L = 22 mm, ζ_R = ζ_L = 9 mm, Ω = 1 mm⁻¹, .