Abstract

Terahertz time-domain spectroscopy is used to study the nature and efficiency of coupling between surface plasmon polaritons and free-space terahertz radiation by metallic gratings made from brass rods and a grooved aluminum plate. Reflection and transmission mode measurements indicate very rapid coupling and decoupling with >70% efficiency after accounting for scattering. Results indicate a good match to theoretical coupling frequencies within the accuracy of the experimental setup.

© 2004 Optical Society of America

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References

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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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Nature (1)

W. Barnes, A. Dereux, and T. Ebbesen, ???Surface plasmon subwavelength optics,??? Nature 424, 824-830 (2003).
[CrossRef] [PubMed]

Opt. Lett. (1)

Phys. Rev. B (1)

J. Saxler, J. G´omez-Rivas, C. Janke, H. P. M. Pellemans, P. Haring-Bol´?var, and H. Kurz, ???Time-domain measurements of surface plasmon polaritons in the terahertz frequency range,??? Phys. Rev. B 69, 155427-1-4 (2004).
[CrossRef]

Proc. I.E.E. (1)

H. Barlow and A. Cullen, ???Surface waves,??? Proc. I.E.E. 100, 329-347 (1953).

Solid State Commun. (1)

J. Schoenwald, E. Burstein, and J. Elson, ???Propagation of surface polaritons over macroscopic distances at optical frequencies,??? Solid State Commun. 12, 185-189 (1973).
[CrossRef]

Surf. Sci. (1)

D. Begley, R. Alexander, C. Ward, R. Miller, and R. Bell, ???Propagation distances of surface electromagnetic waves in the far infrared,??? Surf. Sci. 81, 245-251 (1979).
[CrossRef]

Other (2)

G. Zhizhin, M. Moskalova, E. Shomina, and V. Yakovlev, ???Surface Electromagnetic Wave Propagation on Metal Surfaces,??? in Surface Polaritons, V. Agronovich and D. Mills, eds. (North-Holland, Amsterdam, 1982), 93-144.

H. Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings (Springer-Verlag, Berlin, 1988).

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Figures (3)

Fig. 1.
Fig. 1.

Diagram of THz system in (a) reflection mode, (b) transmission mode. (c) Brass rod grating, large arrow shows grating rotation direction, large circle describes hole in Lexan holder, small circle describes THz spot size. (d) Aluminum plate grating, circle describes THz spot size. Figures are not to scale.

Fig. 2.
Fig. 2.

Time-domain THz signals. (a) and (c) are reflected signals from brass rod and Al plate gratings, respectively. (b) Transmission through 0.5 mm rod grating. Thin and thick curves in (a)–(c) correspond to parallel and perpendicular grating configurations, respectively. Signals are shifted for clarity. All signals in (b) are scaled up in amplitude by three times. Window boundaries for spectra in Fig. 3 are indicated by boxes in. (d) Plan view of geometric reflection effects accounting for additional scattering loss in perpendicular configuration.

Fig. 3.
Fig. 3.

Energy spectra of collected waveforms. The thick dashed curves are reference spectra from flat mirror targets in (a) and (c) or from free-space transmission (no target) in (b). Thin curves in (a) and (c) correspond to the parallel grating configurations. Thick curves in (a) and (c) are spectra of the windowed ringing data labeled in Fig. 2. Both solid curves in (b) are spectra of windowed ringing data labeled in Fig. 2. All spectra were normalized with the same value and, for clarity, the spectra in (b) were scaled up as indicated. (d) Illustration of rod imperfections.

Equations (1)

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E SB = 1 N f = f 0 f 1 DFT [ f ] 2

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