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Effects of two-photon absorption on terahertz radiation generated by femtosecond-laser excited photoconductive antennas Abstract: Terahertz (THz) radiation can be generated more efficiently from a low-temperature-grown GaAs (LT-GaAs) photoconductive (PC) antenna by considering the two-photon absorption (TPA) induced photo-carrier in the photoconductor. A rate-equation-based approach using the Drude-Lorentz model taking into account the band-diagram of LT-GaAs is used for the theoretical analysis. The use of transform-limited pulses at the PC antenna is critical experimentally. Previously unnoticed THz pulse features and anomalously increasing THz radiation power rather than saturation were observed. These are in good agreement with the theoretical predictions. The interplay of intensity dependence and dynamics of generation of photoexcited carriers by single-photon absorption and TPA for THz emission is discussed. c 2011 Optical Society of America References and links 1. D. H. 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Smith, “Refractive index and absorption changes in low-temperature-grown GaAs,” Opt. Commun. 155(1-3), 206 –212 (1998). 13. P. U. Jepsen, R. H. Jacobsen, and S. R. Keiding, “Generation and detection of terahertz pulses from biased semiconductor antennas,” J. Opt. Soc. Am. B 13(11), 2424–2436 (1996). 14. Z. Piao, M. Tani, and K. Sakai, “Carrier dynamics and terahertz radiation in photoconductive antennas,” Jpn. J. Appl. Phys. 39(Part 1, No. 1), 96–100 (2000). 15. L. Duvillaret, F. Garet, J.-F. Roux, and J.-L. Coutaz, “Analytical modeling and optimization of terahertz time-domain spectroscopy experiments, using photoswitches as antennas,” IEEE J. Sel. Top. Quantum Electron. 7(4), 615–623 (2001). 16. R.-P. Pan, C.-F. Hsieh, C.-L. Pan, and C.-Y. Chen, “ Temperature-dependent optical constants and birefringence of nematic liquid crystal 5CB in the terahertz frequency range,” J. Appl. Phys. 103(9), 093523 (2008). 17. M. C. Chen, J. Y. Huang, Q. Yang, C. L. Pan, and J.-I. Chyi, “Freezing phase scheme for fast adaptive control and its application to characterization of femtosecond coherent optical pulses reflected from semiconductor saturable absorber mirrors,” J. Opt. Soc. Am. B 22(5), 1134– 1142 (2005). 18. S.-G. Park, M. R. Melloch, and A. M. Weiner, “Analysis of terahertz waveforms measured by photoconductive and electrooptic sampling,” IEEE J. Quantum Electron. 35(5), 810–819 (1999). 19. E. Castro-Camus, L. Fu, J. Lloyd-Hughes, H. H. Tan, C. Jagadish, and M. B. Johnston, “Photoconductive response correction for detectors of terahertz radiation,” J. Appl. Phys. 104(5), 053113 (2008). 20. X. Q. Zhou, H. M. van Driel. W. W. Rühle, and K. Ploog, “Direct observation of a reduced cooling rate of hot carriers in the presence of nonequilibrium LO phonons in GaAs:As,” Phys. Rev. B Condens. Matter 46(24), 16148–16151 (1992). 21. P. C. Upadhya, W. Fan, A. Burnett, J. Cunningham, A. G. Davies, E. H. Linfield, J. Lloyd-Hughes, E. Castro-Camus, M. B. Johnston, and H. Beere, “ Excitation-density-dependent generation of broadband terahertz radiation in an asymmetrically excited photoconductive antenna,” Opt. Lett. 32(16), 2297– 2299 (2007). 請不要 end 這是我最近的人生 Q^Q 我好想去找你們玩喔!!!!!! By the way 暑假好想騎腳踏車去環島有沒有人要+1 咧 -- 顆顆　這是一篇有學術涵養的文章 ※ 編輯: DDD2002 來自: 124.8.141.65 (03/09 01:03)

推

timyanzi

03/09 14:28, , 1^F

03/09 14:28, 1^F

其實中間都是reference阿顆顆XD 雞哥何時要死會？

推

mark8422

03/09 16:42, , 2^F

03/09 16:42, 2^F

推

akjohn

03/09 16:45, , 3^F