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Strong terahertz (THz) radiation of MV/cm can be generated from air via two-color laser scheme. In this paper, we introduce three recent theoretical and experimental researches conducted by Wang et al., in which they explored the long-standing problem of THz generation mechanism and extended the scheme with uncommon frequency ratio. In the widely-studied two-color laser scheme, the frequency ratio of the two lasers is usually fixed at 2/1=1:2. In 2013 they predicted according to the plasma current model, for the first time, that the two-color scheme can be extended to a new frequency ratio 1:2n, where n is an positive integer. In 2017 they found that the frequency ratio can be further extended to much broader values. In that year, their experiments showed, for the first time, efficient THz generation with new ratios of 2/1=1:4 and 2:3. They observed that the THz polarization can be adjusted by rotating the longer-wavelength laser polarization, but the polarization adjustment becomes inefficient by rotating the other laser polarization, which is inconsistent with the symmetric nature in the susceptibility tensor required by the multi-wave mixing theory; the THz energy shows similar scaling laws with different frequency ratios, which is inconsistent with the scaling predicted according to the multi-wave mixing theory. These experimental results are in agreement with the plasma current model and particle-in-cell simulations. Therefore, their studies not only push the development of the two-color scheme, but also show that the THz generation mechanism should be mainly attributed to the plasma current model.
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Keywords:
- terahertz radiation /
- light ionization /
- laser plasma interaction /
- particle-in-cell simulation
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[3] Cook D J, Hochstrasser R M 2000 Opt. Lett. 25 1210
[4] Sheng Z M, Mima K, Zhang J, Sanuki H 2005 Phys. Rev. Lett. 94 095003
[5] Li Y T, Li C, Zhou M L, Wang W M, Du F, Ding W J, Lin X X, Liu F, Sheng Z M, Peng X Y, Chen L M, Ma J L, Lu X, Wang Z H, Wei Z Y, Zhang J 2012 Appl. Phys. Lett. 100 254101
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[15] Xie X, Dai J, Zhang X C 2006 Phys. Rev. Lett. 96 075005
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[19] Zhang Z, Chen Y, Chen M, Zhang Z, Yu J, Sheng Z, Zhang J 2016 Phys. Rev. Lett. 117 243901
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[22] Wen H, Lindenberg A M 2009 Phys. Rev. Lett. 103 023902
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[28] Wang W M, Sheng Z M, Li Y T, Zhang Y, Zhang J 2017 Phys. Rev. A 96 023844
[29] Zhang L L, Wang W M, Wu T, Zhang R, Zhang S J, Zhang C L, Zhang Y, Sheng Z M, Zhang X C 2017 Phys. Rev. Lett. 119 235001
[30] Liu K, Koulouklidis A D, Papazoglou D G, Tzortzakis S, Zhang X C 2016 Optica 3 605
[31] Wang W M, Gibbon P, Sheng Z M, Li Y T 2015 Phys. Rev. E 91 013101
[32] Wang W M, Kawata S, Sheng Z M, Li Y T, Zhang J 2011 Phys. Plasmas 18 073108
[33] Penetrante B M, Bardsley J N 1991 Phys. Rev. A 43 3100
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[1] Ulbricht R, Hendry E, Shan J, Heinz T F, Bonn M 2011 Rev. Mod. Phys. 83 543
[2] Hamster H, Sullivan A, Gordon S, White W, Falcone R W 1993 Phys. Rev. Lett. 71 2725
[3] Cook D J, Hochstrasser R M 2000 Opt. Lett. 25 1210
[4] Sheng Z M, Mima K, Zhang J, Sanuki H 2005 Phys. Rev. Lett. 94 095003
[5] Li Y T, Li C, Zhou M L, Wang W M, Du F, Ding W J, Lin X X, Liu F, Sheng Z M, Peng X Y, Chen L M, Ma J L, Lu X, Wang Z H, Wei Z Y, Zhang J 2012 Appl. Phys. Lett. 100 254101
[6] Gopal A, Herzer S, Schmidt A, Singh P, Reinhard A, Ziegler W, Brommel D, Karmakar A, Gibbon P, Dillner U, May T, Meyer H G, Paulus G G 2013 Phys. Rev. Lett. 111 074802
[7] Jin Z, Chen Z L, Zhuo H B, Kon A, Nakatsutsumi M, Wang H B, Zhang B H, Gu Y Q, Wu Y C, Zhu B, Wang L, Yu M Y, Sheng Z M, Kodama R 2011 Phys. Rev. Lett. 107 265003
[8] Dey I, Jana K, Fedorov V Y, Koulouklidis A D, Mondal A, Shaikh M, Sarkar D, Lad A D, Tzortzakis S, Couairon A, Kumar G R 2017 Nat. Commun. 8 1184
[9] Jin Q, E Y, Williams K, Dai J, Zhang X C 2017 Appl. Phys. Lett. 111 071103
[10] D'Amico C, Houard A, Franco M, Prade B, Mysyrowicz A, Couairon A, Tikhonchuk V T 2007 Phys. Rev. Lett. 98 235002
[11] Wang W M, Kawata S, Sheng Z M, Li Y T, Zhang J, Chen L M, Qian L J, Zhang J 2011 Opt. Lett. 36 2608
[12] Bai Y, Song L, Xu R, Li C, Liu P, Zeng Z, Zhang Z, Lu H, Li R, Xu Z 2012 Phys. Rev. Lett. 108 255004
[13] Liao G Q, Li Y T, Li C, Su L N, Zheng Y, Liu M, Wang W M, Hu Z D, Yan W C, Dunn J, Nilsen J, Hunter J, Liu Y, Wang X, Chen L M, Ma J L, Lu X, Jin Z, Kodama R, Sheng Z M, Zhang J 2015 Phys. Rev. Lett. 114 255001
[14] Liao G Q, Li Y T, Zhang Y H, Liu H, Ge X L, Yang S, Wei W Q, Yuan X H, Deng Y Q, Zhu B J, Zhang Z, Wang W M, Sheng Z M, Chen L M, Lu X, Ma J L, Wang X, Zhang J 2016 Phys. Rev. Lett. 116 205003
[15] Xie X, Dai J, Zhang X C 2006 Phys. Rev. Lett. 96 075005
[16] Kim K Y, Glownia J H, Taylor A J, Rodriguez G 2007 Opt. Express 15 4577
[17] Wang W M, Sheng Z M, Wu H C, Chen M, Li C, Zhang J, Mima M 2008 Opt. Express 16 16999
[18] Wang W M, Gibbon P, Sheng Z M, Li Y T 2014 Phys. Rev. A 90 023808
[19] Zhang Z, Chen Y, Chen M, Zhang Z, Yu J, Sheng Z, Zhang J 2016 Phys. Rev. Lett. 117 243901
[20] Wu H C, Meyer-ter-Vehn J, Sheng Z M 2008 New J. Phys. 10 043001
[21] Dai J, Karpowicz N, Zhang X C 2009 Phys. Rev. Lett. 103 023001
[22] Wen H, Lindenberg A M 2009 Phys. Rev. Lett. 103 023902
[23] Wang W M, Gibbon P, Sheng Z M, Li Y T 2015 Phys. Rev. Lett. 114 253901
[24] Clerici M, Peccianti M, Schmidt B E, Caspani L, Shalaby M, Giguere M, Lotti A, Couairon A, Legare F, Ozaki T, Faccio D, Morandotti R 2013 Phys. Rev. Lett. 110 253901
[25] Vvedenskii N V, Korytin A I, Kostin V A, Murzanev A A, Silaev A A, Stepanov A N 2014 Phys. Rev. Lett. 112 055004
[26] Wang W M, Li Y T, Sheng Z M, Lu X, Zhang J 2013 Phys. Rev. E 87 033108
[27] Kostin V A, Laryushin I D, Silaev A A, Vvedenskii N V 2016 Phys. Rev. Lett. 117 035003
[28] Wang W M, Sheng Z M, Li Y T, Zhang Y, Zhang J 2017 Phys. Rev. A 96 023844
[29] Zhang L L, Wang W M, Wu T, Zhang R, Zhang S J, Zhang C L, Zhang Y, Sheng Z M, Zhang X C 2017 Phys. Rev. Lett. 119 235001
[30] Liu K, Koulouklidis A D, Papazoglou D G, Tzortzakis S, Zhang X C 2016 Optica 3 605
[31] Wang W M, Gibbon P, Sheng Z M, Li Y T 2015 Phys. Rev. E 91 013101
[32] Wang W M, Kawata S, Sheng Z M, Li Y T, Zhang J 2011 Phys. Plasmas 18 073108
[33] Penetrante B M, Bardsley J N 1991 Phys. Rev. A 43 3100
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