Abstract
Surface plasmons have found a broad range of applications in photonic devices at visible and near-infrared wavelengths. In contrast, longer-wavelength surface electromagnetic waves, known as Sommerfeld or Zenneck waves1,2, are characterized by poor confinement to surfaces and are therefore difficult to control using conventional metallo-dielectric plasmonic structures. However, patterning the surface with subwavelength periodic features can markedly reduce the asymptotic surface plasmon frequency, leading to ‘spoof’ surface plasmons3,4 with subwavelength confinement at infrared wavelengths and beyond, which mimic surface plasmons at much shorter wavelengths. We demonstrate that by directly sculpting designer spoof surface plasmon structures that tailor the dispersion of terahertz surface plasmon polaritons on the highly doped semiconductor facets of terahertz quantum cascade lasers, the performance of the lasers can be markedly enhanced. Using a simple one-dimensional grating design, the beam divergence of the lasers was reduced from ∼180° to ∼10°, the directivity was improved by over 10 decibels and the power collection efficiency was increased by a factor of about six compared with the original unpatterned devices. We achieve these improvements without compromising high-temperature performance of the lasers.
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Acknowledgements
We gratefully acknowledge constructive and helpful discussions with R. Blanchard, C. Pflügl, L. Diehl and A. Belyanin. M.A.K. is supported by the National Science Foundation through a Graduate Research Fellowship. We would like to thank N. Antoniou for assistance in FIB milling. We acknowledge support from AFOSR under contract No. FA9550-09-0505-DOD and the EPSRC (UK). The authors acknowledge the Center for Nanoscale Systems (CNS) at Harvard University. Harvard CNS is a member of the National Nanotechnology Infrastructure Network (NNIN). The computations in this Letter were run on the Odyssey cluster supported by the Harvard Faculty of Arts and Sciences (FAS) Sciences Division Research Computing Group.
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N.Y. designed the devices, in collaboration with J.A.F., and, with Q.J.W., fabricated them and carried out the experiments. M.A.K. participated in the device simulation and in the data analysis. S.P.K. and L.L. grew QCL material using molecular beam epitaxy. N.Y. and F.C. wrote the paper. F.C., A.G.D. and E.H.L. supervised the project.
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Yu, N., Wang, Q., Kats, M. et al. Designer spoof surface plasmon structures collimate terahertz laser beams. Nature Mater 9, 730–735 (2010). https://doi.org/10.1038/nmat2822
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DOI: https://doi.org/10.1038/nmat2822
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