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Tuning a terahertz wire laser

Nature Photonics volume 3, pages 732–737 (2009)Cite this article

Abstract

Tunable terahertz lasers are desirable in applications in sensing and spectroscopy because many biochemical species have strong spectral fingerprints at terahertz frequencies. Conventionally, the frequency of a laser is tuned in a similar manner to a stringed musical instrument, in which pitch is varied by changing the length of the string (the longitudinal component of the wave vector) and/or its tension (the refractive index). However, such methods are difficult to implement in terahertz semiconductor lasers because of their poor outcoupling efficiencies. Here, we demonstrate a novel tuning mechanism based on a unique ‘wire laser’ device for which the transverse dimension w is ≪λ. Placing a movable object close to the wire laser manipulates a large fraction of the waveguided mode propagating outside the cavity, thereby tuning its resonant frequency. Continuous single-mode redshift and blueshift tuning is demonstrated for the same device by using either a dielectric or metallic movable object. In combination, this enables a frequency tuning of ∼137 GHz (3.6%) from a single laser device at ∼3.8 THz.

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Figure 1: Illustration of different tuning mechanisms.
Figure 2: The concept of tuning a wire laser.
Figure 3: Experimental setup and simulation results.
Figure 4: Tuning results from device T114.
Figure 5: Continuous tuning spectra.

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References

  1. Mittleman, D. (ed.) Sensing with Terahertz Radiation (Springer, 2003).

    Book  Google Scholar 

  2. Davies, A. G., Linfield, E. H. & Pepper, M. The terahertz gap: the generation of far-infrared radiation and its applications. Phil. Trans. R. Soc. Lond. A 362, 195–414 (2004).

    Article  Google Scholar 

  3. Siegel, P. H. Terahertz technology. IEEE Trans. Microwave Theory Tech. 50, 910–928 (2002).

    Article  ADS  Google Scholar 

  4. Tonouchi, M. Cutting-edge terahertz technology. Nature Photon. 1, 97–105 (2007).

    ADS  Google Scholar 

  5. Lee, M. & Wanke, M. C. Searching for a solid-state terahertz technology. Science 316, 64–65 (2007).

    Article  Google Scholar 

  6. Köhler, R. et al. Terahertz semiconductor–heterostructure laser. Nature 417, 156–159 (2002).

    Article  ADS  Google Scholar 

  7. Williams, B. S. Terahertz quantum-cascade lasers. Nature Photon. 1, 517–525 (2007).

    Article  ADS  Google Scholar 

  8. Lee, A. W. M., Qin, Q., Kumar, S., Hu, Q. & Reno, J. L. Frequency-tunable external cavity terahertz quantum cascade laser. In Conference on Lasers and Electro-Optics/International Quantum Electronics Conference. OSA Technical Digest (CD), paper CThH5 (Optical Society of America, 2009).

  9. Kumar, S. et al. Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal–metal waveguides. Opt. Express 15, 113–128 (2007).

    Article  ADS  Google Scholar 

  10. Dunbar, L. A. et al. Small optical volume terahertz emitting microdisk quantum cascade lasers. Appl. Phys. Lett. 90, 141114 (2007).

    Article  ADS  Google Scholar 

  11. Zhang, H. et al. Terahertz photonic crystal quantum cascade lasers. Opt. Express 15, 16818–16827 (2007).

    Article  ADS  Google Scholar 

  12. Buus, J., Amann, M.-C. & Blumenthal, D. J. Tunable Laser Diodes and Related Optical Sources (John Wiley & Sons, 2005).

    Book  Google Scholar 

  13. Orlova, E. E. et al. Antenna model for wire lasers. Phys. Rev. Lett. 96, 173904 (2006).

    Article  ADS  Google Scholar 

  14. Xu, J. et al. Tunable THz quantum cascade lasers with an external cavity. Appl. Phys. Lett. 91, 121104 (2007).

    Article  ADS  Google Scholar 

  15. Huang, M. C. Y., Zhou, Y. & Chang-Hasnain, C. J. A nanoelectromechanical tunable laser. Nature Photon. 2, 180–184 (2008).

    Article  ADS  Google Scholar 

  16. Maulini, R. et al. External cavity quantum-cascade laser tunable from 8.2 to 10.4 μm using a gain element with a heterogeneous cascade. Appl. Phys. Lett. 88, 201113 (2006).

    Article  ADS  Google Scholar 

  17. Amann, M.-C., Illek, S., Schanen, C. & Thulke, W. Tunable twin-guide laser: a novel laser diode with improved tuning performance. Appl. Phys. Lett. 54, 2532–2533 (1989).

    Article  ADS  Google Scholar 

  18. Williams, B. S., Kumar, S., Callebaut, H., Hu, Q. & Reno, J. L. Terahertz quantum-cascade laser at λ ≈ 100 μm using metal waveguide for mode confinement. Appl. Phys. Lett. 83, 2124–2126 (2003).

    Article  ADS  Google Scholar 

  19. Kohen, S., Williams, B. S. & Hu, Q. Electromagnetic modeling of terahertz quantum cascade laser waveguides and resonators. J. Appl. Phys. 97, 053106 (2005).

    Article  ADS  Google Scholar 

  20. Hu, Q. et al. Resonant-phonon-assisted THz quantum-cascade lasers with metal–metal waveguides. Semicond. Sci. Technol. 20, S228–S236 (2005).

    Article  ADS  Google Scholar 

  21. Adam, A. J. L. et al. Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions. Appl. Phys. Lett. 88, 151105 (2006).

    Article  ADS  Google Scholar 

  22. Huang, M. H. et al. Room-temperature ultraviolet nanowire nanolasers. Science 292, 1897–1899 (2001).

    ADS  Google Scholar 

  23. Duan, X. et al. Single-nanowire electrically driven lasers. Nature 421, 241–245 (2003).

    Article  ADS  Google Scholar 

  24. Zimmler, M. A. et al. Laser action in nanowires: observation of the transition from amplified spontaneous emission to laser oscillation. Appl. Phys. Lett. 93, 051101 (2008).

    Article  ADS  Google Scholar 

  25. Williams, B. S., Kumar, S., Hu, Q. & Reno, J. L. Distributed-feedback terahertz quantum-cascade lasers with laterally corrugated metal waveguides. Opt. Lett. 30, 2909–2911 (2005).

    Article  ADS  Google Scholar 

  26. Williams, B. S., Kumar, S., Hu, Q. & Reno, J. L. Operation of terahertz quantum-cascade lasers at 164 K in pulsed mode and at 117 K in continuous-wave mode. Opt. Express 13, 3331–3339 (2005).

    Article  ADS  Google Scholar 

  27. Baumberger, T., Heslot, F. & Perrin, B. Crossover from creep to inertial motion in friction dynamics. Nature 367, 544–546 (1994).

    Article  ADS  Google Scholar 

  28. Braun, O. M. & Naumovets, A. G. Nanotribology: microscopic mechanisms of friction. Surf. Sci. Rep. 60, 79–158 (2006).

    Article  ADS  Google Scholar 

  29. Rupert, F. O. et al. Plasmon lasers at deep subwavelength scale. Nature 461, 629–632 (2009).

    Google Scholar 

  30. Mauro, C. et al. Amplification of terahertz radiation in quantum cascade structures. J. Appl. Phys. 102, 063101 (2007).

    Article  ADS  Google Scholar 

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Acknowledgements

This work was supported by the Air Force Office of Scientific Research, National Aeronautics and Space Administration, and National Science Foundation. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under contract no. DE-AC04-94AL85000.

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Authors and Affiliations

  1. Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, 02139, Massachusetts, USA

    Qi Qin, Benjamin S. Williams, Sushil Kumar & Qing Hu

  2. Department of Electrical Engineering and California NanoSystems Institute, University of California, Los Angeles, 90095, California, USA

    Benjamin S. Williams

  3. Department 1123, Sandia National Laboratories, MS 0601, Albuquerque, 87185-0601, New Mexico, USA

    John L. Reno

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  1. Qi Qin
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  2. Benjamin S. Williams
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  5. Qing Hu
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Correspondence to Qing Hu.

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Qin, Q., Williams, B., Kumar, S. et al. Tuning a terahertz wire laser. Nature Photon 3, 732–737 (2009). https://doi.org/10.1038/nphoton.2009.218

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