[1] R. Ulrich. Theory of the prism-film coupler by plane-wave analysis[J]. J. Opt. Soc. Am., 1970, 60(10): 1337～1349

[2] T. Tamir, S. T. Peng. Analysis and design of grating couplers[J]. Appl. Phys., 1977, 14(3): 235～253

[3] H. Li, Z. Cao, H. Lu et al.. Free-space coupling of light beam into a symmetrical metal-cladding optical waveguide[J]. Appl. Phys. Lett., 2003, 83(14): 2757～2759

[4] H. Lu, Z. Cao, H. Li et al.. Study of ultrahigh-order modes in a symmetrical metal-cladding optical waveguide[J]. Appl. Phys. Lett., 2004, 85(20): 4579～4581

[5] I. P. Kaminov, W. L. Mammel, H. P. Weber. Metal-clad optical waveguides: Analytical and experimental study[J]. Appl. Opt., 1974, 13(2): 396～405