[1] Savage K J, Hawkeye M M, Esteban R, et al. Nature, 2012, 491(7425): 574.

[2] Chen J N, Badioli M, Alonso-González P, et al. Nature, 2012, 487(7405): 77.

[4] Basch A, Beck F J, Soderstrom T, et al. Applied Physics Letters, 2012, 100(24): 243903.

[5] Ouyang Z, Zhao X, Varlamov S, et al. Progress in Photovoltaics Research & Applications, 2011, 19(8): 917.

[6] Pillai S, Beck F J, Catchpole K R, et al. Journal of Applied Physics, 2011, 109(7): 205.

[7] Madzharov D, Dewan R, Knipp D. Optics Express, 2011, 19 Suppl 2(6): A95.

[8] Sun C, Su J, Wang X. Plasmonics, 2015, 10(3): 633.

[9] Sun C, Wang X Q. Plasmonics, 2015, 10(6): 1307.

[10] Sun C, Wang Z, Wang X, et al. Plasmonics, 2016, 11(4): 1003.

[11] Wang Z, Sun C, Wang X. Plasmonics, 2016, 12(3): 589.

[12] Li H J, Wang L L, Huang Z R, et al. Plasmonics, 2015, 10(1): 39.

[13] Kusa F, Ashihara S. Journal of Applied Physics, 2014, 116: 153103.

[14] FDTD Solutions. www.lumerical.com.