Time-resolved imaging of mode-conversion process of terahertz transients in subwavelength waveguides

Abstract

We studied the mode-conversion process of terahertz pulses from a planar subwavelength waveguide to a tilted rectangular subwavelength waveguide. An unusual wavefront rotation, which led to an extra conversion time, was observed using a time-resolved imaging technique. We simulated the mode conversion process by a finite-difference time-domain method, and the results agreed well with the experiments. According to the simulations, the conversion time was demonstrated to become longer as the tilt angle or width of the rectangular waveguide increased. This work provides the possibility to optimize the future high-speed communications and terahertz integrated platforms.

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References

  1. 1.

    W. Li, B. Chen, C. Meng, W. Fang, Y. Xiao, X. Li, Z. Hu, Y. Xu, L. Tong, H. Wang, W. Liu, J. Bao, and Y. R. Shen, Ultrafast all-optical graphene modulator, Nano Lett. 14(2), 955 (2014)

    ADS  Article  Google Scholar 

  2. 2.

    M. E. Fermann and I. Hartl, Ultrafast fiber laser technology, IEEE J. Sel. Top. Quantum Electron. 15(1), 191 (2009)

    ADS  Article  Google Scholar 

  3. 3.

    S. Sugiura and H. Iizuka, Deep-subwavelength MIMO using graphene-based nanoscale communication channel, IEEE Access 2, 1240 (2014)

    Article  Google Scholar 

  4. 4.

    L. R. Chen, J. Wang, B. Naghdi, and I. Glesk, Subwavelength grating waveguide devices for telecommunications applications, IEEE J. Sel. Top. Quantum Electron. 25(3), 8200111 (2019)

    Article  Google Scholar 

  5. 5.

    C. Yang, Q. Wu, J. Xu, K. A. Nelson, and C. A. Werley, Experimental and theoretical analysis of THz-frequency, direction-dependent, phonon polariton modes in a subwavelength, anisotropic slab waveguide, Opt. Express 18(25), 26351 (2010)

    ADS  Article  Google Scholar 

  6. 6.

    Y. Lu, Q. Wu, Q. Zhang, R. Wang, W. Zhao, D. Zhang, C. Pan, J. Qi, and J. Xu, Propagation of THz pulses in rectangular subwavelength dielectric waveguides, J. Appl. Phys. 123(22), 223103 (2018)

    ADS  Article  Google Scholar 

  7. 7.

    A. H. Atabaki, S. Moazeni, F. Pavanello, H. Gevorgyan, J. Notaros, L. Alloatti, M. T. Wade, C. Sun, S. A. Kruger, and H. Meng, Integrating photonics with silicon nanoelectronics for the next generation of systems on a chip, Nature 556(7701), 349 (2018)

    ADS  Article  Google Scholar 

  8. 8.

    W. Zhang and J. Yao, A fully reconfigurable waveguide Bragg grating for programmable photonic signal processing, Nat. Commun. 9(1), 1396 (2018)

    ADS  Article  Google Scholar 

  9. 9.

    B. le Feber, N. Rotenberg, and L. Kuipers, Nanophotonic control of circular dipole emission, Nat. Commun. 6(1), 6695 (2015)

    ADS  Article  Google Scholar 

  10. 10.

    H. Shin, J. A. Cox, R. Jarecki, A. Starbuck, Z. Wang, and P.T. Rakich, Control of coherent information via onchip photonic-phononic emitter-receivers, Nat. Commun. 6, 6427 (2015)

    ADS  Article  Google Scholar 

  11. 11.

    A. Y. Piggott, J. Lu, K. G. Lagoudakis, J. Petykiewicz, T. M. Babinec, and J. Vuckovic, Inverse design and demonstration of a compact and broadband on-chip wavelength demultiplexer, Nat. Photon. 9, 374 (2015)

    ADS  Article  Google Scholar 

  12. 12.

    Y. Tan, H. Wu, S. Wang, C. Li, and D. Dai, Silicon-based hybrid demultiplexer for wavelength- and mode-division multiplexing, Opt. Lett. 43(9), 1962 (2018)

    ADS  Article  Google Scholar 

  13. 13.

    D. Dai, C. Li, S. Wang, H. Wu, Y. Shi, Z. Wu, S. Gao, T. Dai, H. Yu, and H. K. Tsang, 10-channel mode (de)multiplexer with dual polarizations, Laser Photon. Rev. 12(1), 1700109 (2018)

    ADS  Article  Google Scholar 

  14. 14.

    S. Koenig, D. Lopezdiaz, J. Antes, F. Boes, R. Henneberger, A. Leuther, A. Tessmann, R. Schmogrow, D. Hillerkuss, R. Palmer, T. Zwick, C. Koos, W. Freude, O. Ambacher, J. Leuthold, and I. Kallfass, Wireless sub-THz communication system with high data rate, Nat. Photon. 7(12), 977 (2013)

    ADS  Article  Google Scholar 

  15. 15.

    S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. Axel Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stöhr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, The 2017 terahertz science and technology roadmap, J. Phys. D Appl. Phys. 50(4), 043001 (2017)

    ADS  Article  Google Scholar 

  16. 16.

    D. L. Woolard, R. Brown, M. Pepper, and M. Kemp, Terahertz frequency sensing and imaging: A time of reckoning future applications? Proc. IEEE 93(10), 1722 (2005)

    Article  Google Scholar 

  17. 17.

    A. G. Davies, A. D. Burnett, W. Fan, E. H. Linfield, and J. E. Cunningham, Terahertz spectroscopy of explosives and drugs, Mater. Today 11(3), 18 (2008)

    Article  Google Scholar 

  18. 18.

    A. Zak, M. A. Andersson, M. Bauer, J. Matukas, A. Lisauskas, H. G. Roskos, and J. Stake, Antennaintegrated 0.6 THz FET direct detectors based on CVD graphene, Nano Lett. 14(10), 5834 (2014)

    ADS  Article  Google Scholar 

  19. 19.

    Q. Zhang, J. Qi, Q. Wu, Y. Lu, W. Zhao, R. Wang, C. Pan, S. Wang, and J. Xu, Surface enhancement of THz wave by coupling a subwavelength LiNbO3 slab waveguide with a composite antenna structure, Sci. Rep. 7(1), 17602 (2017)

    ADS  Article  Google Scholar 

  20. 20.

    G. Scalari, C. Maissen, D. Turcinkova, D. Hagenmuller, S. De Liberato, C. Ciuti, C. Reichl, D. Schuh, W. Wegscheider, M. Beck, and J. Faist, Ultrastrong coupling of the cyclotron transition of a 2D electron gas to a THz metamaterial, Science 335(6074), 1323 (2012)

    ADS  Article  Google Scholar 

  21. 21.

    B. Zhang, Q. Wu, C. Pan, R. Feng, J. Xu, C. Lou, X. Wang, and F. Yang, THz band-stop filter using metamaterials surfaced on LiNbO3 sub-wavelength slab waveguide, Opt. Express 23(12), 16042 (2015)

    ADS  Article  Google Scholar 

  22. 22.

    P. Sivarajah, A. Steinbacher, B. Dastrup, and K. Nelson, THz-frequency cavity magnon-phonon-polaritons in the strong coupling regime, arXiv: 1707.03503 (2017)

    Google Scholar 

  23. 23.

    C. Pan, Q. Wu, Q. Zhang, W. Zhao, J. Qi, J. Yao, C. Zhang, W. T. Hill, and J. Xu, Direct visualization of light confinement and standing wave in THz Fabry–Perot resonator with Bragg mirrors, Opt. Express 25(9), 9768 (2017)

    ADS  Article  Google Scholar 

  24. 24.

    T. P. Dougherty, G. P. Wiederrecht, K. A. Nelson, M. H. Garrett, H. P. Jensen, and C. Warde, Femtosecond resolution of soft mode dynamics in structural phase transitions, Science 258(5083), 770 (1992)

    ADS  Article  Google Scholar 

  25. 25.

    T. P. Dougherty, G. P. Wiederrecht, and K. A. Nel-son, Impulsive stimulated Raman scattering experiments in the polariton regime, J. Opt. Soc. Am. B 9(12), 2179 (1992)

    ADS  Article  Google Scholar 

  26. 26.

    Q. Wu, C. A. Werley, K. H. Lin, A. Dorn, M. G. Bawendi, and K. A. Nelson, Quantitative phase contrast imaging of THz electric fields in a dielectric waveguide, Opt. Express 17(11), 9219 (2009)

    ADS  Article  Google Scholar 

  27. 27.

    C. H. Henry and J. J. Hopfield, Raman scattering by polaritons, Phys. Rev. Lett. 15, 964 (1965)

    ADS  Article  Google Scholar 

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 61705013 and 61378018), the 111 Project (No. B07013), and the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT 13R29).

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Correspondence to Qiang Wu or Bin Zhang.

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Lu, Y., Wu, Q., Zhang, Q. et al. Time-resolved imaging of mode-conversion process of terahertz transients in subwavelength waveguides. Front. Phys. 14, 42502 (2019). https://doi.org/10.1007/s11467-019-0892-5

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Keywords

  • ultrafast phenomenon
  • mode conversion
  • subwavelength waveguides
  • terahertz waves