Apodized grating coupler using fully-etched nanostructures

Wu Hua^{1, 2}, Li Chong¹, Li Zhi-Yong³, Guo Xia^{1, 4, †,}

Schematic diagram of an apodized grating coupler with nanostructures serving as grating grooves: (a) side view; (b) top view.