如图所示,在直三棱柱\(ABC-{{A}_{1}}{{B}_{1}}{{C}_{1}}\)中,\(\angle ACB={{90}^{\circ }}\),\(AB=2\),\(BC=1\),\(A{{A}_{1}}=\sqrt{3}\).
![](https://www.ebk.net.cn/tikuimages/2/2018/500/shoutiniao35/9d0a7cdd3abdcda9f49286b4b28eed98.png)
\((\)Ⅰ\()\)证明:\({{A}_{1}}C\bot A{{B}_{1}}\);
\((\)Ⅱ\()\)若\(D\)是棱\(C{{C}_{1}}\)的中点,在棱\(AB\)上是否存在一点\(E\),使\(DE/\!/\)平面\(A{{B}_{1}}{{C}_{1}}\)?证明你的结论.