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The terahertz (THz) radiation becomes an attractive light source utilized in molecular dynamic spectroscopy, remote sensing, medicine, communication and fundamental research. The controlling of the THz spectrum is necessary for the applications. In this paper, a method is proposed for controlling the terahertz spectra generated from the laser induced plasma by two-color pluses based on the contribution of plasma oscillation. The plasma current oscillation can shift the THz spectrum when the length of medium is less than plasma skin depth. Experimentally we use a short length of molecules by means of the molecular beam method. We investigate the changing spectrum of broadband ultrashort terahertz THz generated from a jet of nitrogen (N2) molecules pumped with the two-color laser pulses following the varying plasma density and plasma length. With the increase of plasma density and the decrease of the plasma length, we observe the increase of THz central frequency (0.8-1.4 THz) and the broadening of the THz spectral width (0.78-1.53 THz). The analysis and the calculation show that the THz spectrum changes due to the frequency and the width of the plasma resonance. This scheme of controlling the THz spectrum by changing the plasma density and length is easier to implement and do not need to use complex shaped optical pulses. The discovery provides a new way of controlling the low-frequency broadband THz spectrum.
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Keywords:
- terahertz /
- ultrashort laser field /
- plasma oscillation frequency
[1] Kampfrath T, Kampfrath K, Nelson K A 2013 Nat. Photon. 7 680
[2] Tonouchi M 2007 Nat. Photon. 1 97
[3] Ferguson B, Zhang X C 2002 Nature Mater. 1 26
[4] Zhang X B, Shi W 2006 Acta Phys. Sin. 55 5237 (in Chinese) [张显斌, 施卫 2006 物理学报 55 5237]
[5] He Z H, Yao J Q, Shi H F, Huang X, Luo X Z, Jiang S J, Wang P 2007 Acta Phys. Sin. 56 5802 (in Chinese) [何志红, 姚建铨, 时华锋, 黄晓, 罗锡璋, 江绍基, 王鹏 2007 物理学报 56 5802]
[6] Reimann K 2008 Nat. Photon. 2 596
[7] Oh T I, Yoo Y J, You Y S, Kim K Y 2014 Appl. Phys. Lett. 105 041103
[8] Xie X, Dai J M, Zhang X C 2006 Phys. Rev. Lett. 96 075005
[9] Kim K Y, Glownia J H, Taylor A J, Rodriguez G 2007 Opt. Express 15 4577
[10] Kim K Y, Taylor A J, Glownia J H, Rodriguez G 2008 Nat. Photon. 2 605
[11] Babushkin I, Skupin S, Husakou A, Khler C, Cabrera-Granado E, Berg L, Herrmann J 2011 New J. Phys. 13 123029
[12] Martinez P G D, Babushkin I, Berg L, Skupin S, Cabrera-Granado E, Khler C, Morgner U, Husakou A, Herrmann J 2015 Phys. Rev. Lett. 114 183901
[13] Balciunas T, Lorenc D, Ivanov M, Smirnova O, Zheltikov A M, Dietze D, Unterrainer K, Rathje T, Paulus G G, Baltuska A, Haessler S 2015 Opt. Express 23 15278
[14] Zhao J Y, Chu W, Guo L, Wang Z, Yang J, Liu W, Cheng Y, Xu Z Z 2014 Sci. Rep. 4 3880
[15] Huang Y D, Meng C, Wang X W, L Z H, Zhang D W, Chen W B, Zhao J, Yuan J M, Zhao Z X 2015 Phys. Rev. Lett. 115 123002
[16] Li M, Li A Y, He B Q, Yuan S, Zeng H P 2016 Chin. Phys. B 25 044209
[17] Chen M, Yuan X H, Sheng Z M 2012 Appl. Phys. Lett. 101 161908
[18] Du H W, Chen M, Sheng Z M, Zhang J, Wu H C, Wang W M 2012 Appl. Phys. Lett. 101 181113
[19] Debayle A, Gremillet L, Berg L, Khler C 2014 Opt. Express 22 13691
[20] Zhao J Y, Zhang Y Z, Wang Z, Chu W, Zeng B, Liu W W, Cheng Y, Xu Z Z 2014 Laser Phys. Lett. 11 095302
[21] Li N, Bai Y, Miao T, Liu P 2016 Opt. Express arXiv:1601.07974
[22] Thomson M D, Blank V, Roskos H G 2010 Opt. Express 18 23173
[23] Das J, Yamaguchi M 2010 Opt. Express 18 7038
[24] Ahn J, Efimov A V, Averitt R D, Taylor A J 2003 Opt. Express 11 2486
[25] Oh T I, You Y S, Kim K Y 2012 Opt. Express 20 19778
[26] Planken P C M, Nienhuys H K, Bakker H J, Wenckebach T 2001 Opt. Soc. Am. B 18 313
[27] Krall N A, Trivelpiece A W 1986 Principles of Plasma Physics(San Francisco : International Series in Pure and Applied Physics) p157
[28] Luria K, Christen W, Even U 2011 J. Phys. Chem. A 115 7362
[29] Ammosov M V, Delone N B, Krainov V P 1986 Sov. Phys. JETP 64 1191
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[1] Kampfrath T, Kampfrath K, Nelson K A 2013 Nat. Photon. 7 680
[2] Tonouchi M 2007 Nat. Photon. 1 97
[3] Ferguson B, Zhang X C 2002 Nature Mater. 1 26
[4] Zhang X B, Shi W 2006 Acta Phys. Sin. 55 5237 (in Chinese) [张显斌, 施卫 2006 物理学报 55 5237]
[5] He Z H, Yao J Q, Shi H F, Huang X, Luo X Z, Jiang S J, Wang P 2007 Acta Phys. Sin. 56 5802 (in Chinese) [何志红, 姚建铨, 时华锋, 黄晓, 罗锡璋, 江绍基, 王鹏 2007 物理学报 56 5802]
[6] Reimann K 2008 Nat. Photon. 2 596
[7] Oh T I, Yoo Y J, You Y S, Kim K Y 2014 Appl. Phys. Lett. 105 041103
[8] Xie X, Dai J M, Zhang X C 2006 Phys. Rev. Lett. 96 075005
[9] Kim K Y, Glownia J H, Taylor A J, Rodriguez G 2007 Opt. Express 15 4577
[10] Kim K Y, Taylor A J, Glownia J H, Rodriguez G 2008 Nat. Photon. 2 605
[11] Babushkin I, Skupin S, Husakou A, Khler C, Cabrera-Granado E, Berg L, Herrmann J 2011 New J. Phys. 13 123029
[12] Martinez P G D, Babushkin I, Berg L, Skupin S, Cabrera-Granado E, Khler C, Morgner U, Husakou A, Herrmann J 2015 Phys. Rev. Lett. 114 183901
[13] Balciunas T, Lorenc D, Ivanov M, Smirnova O, Zheltikov A M, Dietze D, Unterrainer K, Rathje T, Paulus G G, Baltuska A, Haessler S 2015 Opt. Express 23 15278
[14] Zhao J Y, Chu W, Guo L, Wang Z, Yang J, Liu W, Cheng Y, Xu Z Z 2014 Sci. Rep. 4 3880
[15] Huang Y D, Meng C, Wang X W, L Z H, Zhang D W, Chen W B, Zhao J, Yuan J M, Zhao Z X 2015 Phys. Rev. Lett. 115 123002
[16] Li M, Li A Y, He B Q, Yuan S, Zeng H P 2016 Chin. Phys. B 25 044209
[17] Chen M, Yuan X H, Sheng Z M 2012 Appl. Phys. Lett. 101 161908
[18] Du H W, Chen M, Sheng Z M, Zhang J, Wu H C, Wang W M 2012 Appl. Phys. Lett. 101 181113
[19] Debayle A, Gremillet L, Berg L, Khler C 2014 Opt. Express 22 13691
[20] Zhao J Y, Zhang Y Z, Wang Z, Chu W, Zeng B, Liu W W, Cheng Y, Xu Z Z 2014 Laser Phys. Lett. 11 095302
[21] Li N, Bai Y, Miao T, Liu P 2016 Opt. Express arXiv:1601.07974
[22] Thomson M D, Blank V, Roskos H G 2010 Opt. Express 18 23173
[23] Das J, Yamaguchi M 2010 Opt. Express 18 7038
[24] Ahn J, Efimov A V, Averitt R D, Taylor A J 2003 Opt. Express 11 2486
[25] Oh T I, You Y S, Kim K Y 2012 Opt. Express 20 19778
[26] Planken P C M, Nienhuys H K, Bakker H J, Wenckebach T 2001 Opt. Soc. Am. B 18 313
[27] Krall N A, Trivelpiece A W 1986 Principles of Plasma Physics(San Francisco : International Series in Pure and Applied Physics) p157
[28] Luria K, Christen W, Even U 2011 J. Phys. Chem. A 115 7362
[29] Ammosov M V, Delone N B, Krainov V P 1986 Sov. Phys. JETP 64 1191
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