Fabricate planar photonic crystal gradient index lens by laser interference lithography

1. Tan, C.
2. Peng, C.S.
3. Zhang, J.
4. Zuobin, W.
5. Petryakov, V.N.
6. Verevkin, Y.K.
7. Olaizola, S.M.
8. Berthou, T.
9. Tisserand, S.