[1] Ning S, Dong H, Zhang N, et al. Optical Materials Express, 2016, 6(12): 3725.

[2] Wang Z, Meng X, Choi S H, et al. Nano Letters, 2016, 16(4): 2471.

[3] Ning S, Wu Z, Dong H, et al. Optics Letters, 2015, 40(6): 990.

[4] Ziegler J, Djiango M, Vidal C, et al. Optics Express, 2015, 23(12): 15152.

[6] Wan Y, An Y, Deng L. Scientific Reports, 2017, 7(1): 1.

[7] Shi X, Wang Y, Wang Z, et al. Advanced Optical Materials, 2013, 2(1): 88.

[9] He D, Bao W, Li L, et al. Optics & Laser Technology, 2017, 91: 193.

[10] Huang H L, Chou C F, Shiao S H, et al. Optics Express, 2013, 21(18): A901.

[11] Heydari E, Flehr R, Stumpe J. Applied Physics Letters, 2013, 102(13): 1110.

[12] Schaub A, Slepi Ka P, Ka p r I, et al. Nanoscale Research Letters, 2013, 8(1): 1.

[13] Zhai T, Xu Z, Wu X, et al. Optics Express, 2016, 24(1): 437.