[1] Gramotnev D K, Bozhevolnyi S I[J]. Nat. Photonics, 4, 83(2010).
[3] McFarland A D, Van Duyne R P[J]. Nano Lett., 3, 1057(2013).
[5] Schietinger S, Barth M, Aichele T, Benson O[J]. Nano Lett., 9, 1694(2009).
[6] Xu H, Bjerneld E J, Käll M, Börjesson L[J]. Phys. Rev. Lett., 83, 4357(1999).
[8] Santhosh K, Bitton O, Chuntonov L, Haran G[J]. Nat. Commun., 7, 11823(2016).
[10] Ramezani M, Le-Van Q, Halpin A, Rivas J G[J]. Phys. Rev. Lett., 121, 243904(2018).
[12] Zhao Z Y, Liu J Q, Li A W, Xu X Y[J]. Acta Phys. Sin., 65, 231101(2016).
[15] Schwartz T, Hutchison J A, Genet C, Ebbesen T W[J]. Phys. Rev. Lett., 106, 196405(2011).
[18] Yu N, Aieta F, Genevet P, Kats M A, Gaburro Z, Capasso F[J]. Nano Lett., 12, 6328(2012).
[21] Jiang S C, Xiong X, Hu Y S, Hu Y H, Ma G B, Peng R W, Sun C, Wang M[J]. Phys. Rev. X, 4, 021026(2014).
[22] Lin D, Fan P, Hasman E, Brongersma M L[J]. Science, 345, 298(2014).
[27] Blaber M G, Arnold M D, Ford M J[J]. J. Phys. Chem. C, 113, 3041(2009).
[28] Dai Y, Ren W, Cai H, Ding H, Pan N, Wang X[J]. Opt. Express, 22, 7465(2014).