光線插入法(RIM)是一種新穎的方法來控制電磁波傳播的路徑，此方法可以設計你所需要的起點終點以及入射和射出角度，並運用eikonal equation數值解出元件起點與終點之間的折射率分布，並使用超表面的週期特性，根據不同折射率要求，使用是當尺寸的貼片，然後根據RIM設計的梯度折射率(GRIN)分布，將貼片分布在接地介電基板。該設計技術透過模擬進行驗證，證明該透鏡依照規定的路徑彎曲且實現了所需的隱形面積和形狀。實際製造出的超表面隱形透鏡經過測量也與預期結果相同。 

▶ Tien-Chen Yang, Yi-Kai Chen, and Malcolm Ng Mou Kehn, "Metasurface cloaking lens designed by the ray insertion method," in IEEE Antennas and Wireless Propagation Letters, vol. 22, no. 6, pp. 1471-1475, June 2023. (Link)
▶ Jen-Yung Li and Malcolm Ng Mou Kehn, "The 90° rotating Eaton lens synthesized by metasurfaces," in IEEE Antennas and Wireless Propagation Letters , vol. 17, no. 7, pp. 1247-1251, July 2018. (Link)
▶ Jiun-Wen Yang, Wei-Yu Lai, Hai-Cheng Chou, and Malcolm Ng Mou Kehn, "Compact Mikaelian lens synthesized by metasurfaces," in IEEE Antennas and Wireless Propagation Letters, vol. 17, no. 3, pp. 397-400, March 2018. (Link)