[1] [1] Fan W H, Burnett A, Upadhya P C, et al. Appl. Spectrosc., 2007, 61(6): 638.

[2] [2] Naftaly M, Miles R E. Proc. IEEE, 2007, 95(8): 1658.

[3] [3] Nibali V C, Havenith M. J. Am. Chem. Soc., 2014, 136(37): 12800.

[4] [4] Kakimi R, Fujita M, Nagai M, et al. Nat. Photonics, 2014, 8(8): 657.

[5] [5] Zang X F, Shi C, Chen L, et al. Sci. Rep., 2015, 5： 8901.

[6] [6] Han P Y, Zhang X C. Meas. Sci. Technol., 2001, 12(11): 1747.

[7] [7] Shen Y C, Upadhya P C, Linfield E H, et al. Appl. Phys. Lett., 2003, 83(15): 3117.

[8] [8] Thomson M D, Blank V, Roskos H G, et al. Opt. Express, 2010, 18(22): 23173.

[9] [9] Shen Y C, Upadhya P C, Beere H E, et al. Appl. Phys. Lett., 2004, 85(2): 164.

[10] [10] Wu Q, Zhang X C. Appl. Phys. Lett., 1997, 71(10): 1285.

[11] [11] Nahata A, Weling A S, Heinz T F, et al. Appl. Phys. Lett., 1996, 69(16): 2321.

[12] [12] Han P Y, Zhang X C. Appl. Phys. Lett., 1998, 73(21): 3049.

[13] [13] Tan J J, Ji G F, Chen X R, et al. Commun. Theor. Phys., 2010, 53(6): 1160.

[14] [14] Kleinman D A, Spitzer W G. Phys. Rev., 1960, 118(1): 110.

[15] [15] Zheng X M, McLaughlin C V, Cunningham P, et al. J. Nanoelectron. Optoelectron, 2007, 2(1): 58.

[16] [16] Nahata A, Auston D H, Wu C J, et al. Appl. Phys. Lett., 1995, 67(10): 1358.

[17] [17] Zheng X M, Sinyukov A, Hayden L M. Appl. Phys. Lett., 2005, 87(8): 081115.

[18] [18] Hamster H, Sullivan A, Gordon S, et al. Phys. Rev. Lett., 1993, 71(17): 2725.

[19] [19] Cook D J, Hochstrasser R M. Opt. Lett., 2000, 25(16): 1210.

[20] [20] Dai J, Xie X, Zhang X C. Phys. Rev. Lett., 2006, 97(10): 103901.

[21] [21] Brus L. Appl. Phys. A-Mater. Sci. Process, 1991, 53(6): 465.

[22] [22] Karpowicz N, Dai J M, Lu X F, et al. Appl. Phys. Lett., 2008, 92(1): 011131.

[23] [23] Lu X F, Karpowicz N, Zhang X C. J. Opt. Soc. Am. B-Opt. Phys., 2009, 26(9): 66.

[24] [24] Lu X F, Zhang X C. J. Infrared Millim., 2011, 32(5): 562.

[25] [25] Dai J M, Clough B, Ho I C, et al. Terahertz Sci. Technol., 2011, 1(1): 274.

[26] [26] Ho I C, Guo X Y, Zhang X C. Opt. Express, 2010, 18(3): 2872.

[27] [27] Lu X F, Zhang X C. Appl. Phys. Lett., 2011, 98(15): 151111.

[28] [28] Liu J L, Dai J M, Chin S L, et al. Nat. Photonics, 2010, 4(9): 627.

[29] [29] Liu J L, Zhang X C. J. Appl. Phys., 2009, 106(2): 023207.

[31] [31] Ho I C, Zhang X C. Appl. Phys. Lett., 2011, 98(24): 241908.

[32] [32] D’Angelo F, Mics Z, Bonn M, et al. Opt. Express, 2014, 22(10): 12475.