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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 24 — Nov. 28, 2005
  • pp: 9834–9840

Optics InfoBase > Optics Express > Volume 13 > Issue 24 > Page 9834

Role of metal film thickness on the enhanced transmission properties of a periodic array of subwavelength apertures

Xiang Shou, Amit Agrawal, and Ajay Nahata  »View Author Affiliations


Optics Express, Vol. 13, Issue 24, pp. 9834-9840 (2005)
http://dx.doi.org/10.1364/OPEX.13.009834


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Abstract

We have measured the enhanced transmission properties of periodic arrays of subwavelength apertures fabricated in thin metal films as a function of the metal film thickness. In doing so, we determine the minimum metal film thickness for an array that exhibits resonantly enhanced transmission and observe the transmission properties as the metal film thickness is increased. The thickness range explored extends from δ/15, where δ is the skin depth, to approximately 2δ. Using terahertz time-domain spectroscopy, we measure both the amplitude and phase of the transmitted broadband THz pulses. Experimentally, we find that there is negligible transmission enhancement for metal films as thin as δ/15. As the film thickness increases, there is a sublinear increase in the enhancement until the film thickness is equal to the skin depth. For metal films thicker than one skin depth, there appears to be little additional enhancement at the resonant frequencies. We also observe that as the thickness of metal films increases, there is a corresponding increase in the resonance frequencies.

© 2005 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves
(260.3090) Physical optics : Infrared, far

ToC Category:
Research Papers

History
Original Manuscript: October 19, 2005
Revised Manuscript: October 18, 2005
Published: November 28, 2005

Citation
Xiang Shou, Amit Agrawal, and Ajay Nahata, "Role of metal film thickness on the enhanced transmission properties of a periodic array of subwavelength apertures," Opt. Express 13, 9834-9840 (2005)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-13-24-9834


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References

  1. T.W. Ebbesen, H.J. Lezec, H.F. Ghaemi, T. Thio, P.A. Wolff, “Extraordinary optical transmission through subwavelength hole arrays,” Nature 391, 667-669 (1998). [CrossRef]
  2. H. Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings, (Vol. 111 of Springer Tracts in Modern Physics, Springer-Verlag, Berlin, 1988).
  3. H.F. Ghaemi, T. Thio, D.E. Grupp, T.W. Ebbesen, and H.J. Lezec, “Surface plasmons enhance optical transmission through subwavelength holes,” Phys. Rev. B 83, 6779-6782 (1998). [CrossRef]
  4. T. Thio, H.F. Ghaemi, H.J. Lezec, P.A. Wolff, and T.W. Ebbesen, “Surface-plasmon-enhanced transmission through hole arrays in Cr films,” J. Opt. Soc. Am. B 16, 1743-1748 (1999). [CrossRef]
  5. M. A. Ordal, L. L. Long, R. J. Bell, S. E. Bell, R. R. Bell, R. W. Alexander, Jr., and C. A. Ward, “Optical properties of the metals Al, Co, Cu, Au, Fe, Pb, Ni, Pd, Pt, Ag, Ti, and W in the infrared and far infrared,” Appl. Opt. 22, 1099-1120 (1983). [CrossRef] [PubMed]
  6. H. Cao and A. Nahata, "Resonantly enhanced transmission of terahertz radiation through a periodic array of subwavelength apertures," Opt. Express 12, 1004-1010 (2004), <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-6-1004">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-6-1004</a>. [CrossRef] [PubMed]
  7. K.J.K. Koerkamp, S. Enoch, F.B. Segerink, N.F. van Hulst, and L. Kuipers, “Strong influence of hole shape on extraordinary transmission through periodic arrays of subwavelength holes,” Phys. Rev. Lett. 92, 183901/1-4 (2004). [CrossRef] [PubMed]
  8. H. Cao and A. Nahata, "Influence of aperture shape on the transmission properties of a periodic array of subwavelength apertures," Opt. Express 12, 3664-3672 (2004), <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-16-3664">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-16-3664</a>. [CrossRef] [PubMed]
  9. R. Gordon, A.G. Brolo, A. McKinnon, A. Rajora, B. Leatham, and K.L. Kavanagh, “Strong polarization in the optical transmission through elliptical nanohole arrays,” Phys. Rev. Lett. 92, 037401 (2004). [CrossRef] [PubMed]
  10. D.E. Grupp, H.J. Lezec, T.W. Ebbesen, K.M. Pellerin, and T. Thio, “Crucial role of metal surface in enhanced transmission through subwavelength apertures,” Appl. Phys. Lett. 77, 1569-1571 (2000). [CrossRef]
  11. A. Degiron and T. W. Ebbesen, "Analysis of the transmission process through single apertures surrounded by periodic corrugations," Opt. Express 12, 3694-3700 (2004), <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-16-3694">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-16-3694</a>. [CrossRef] [PubMed]
  12. N. Bonod, S. Enoch, L. Li, P. Evgeny, and M. Neviere, "Resonant optical transmission through thin metallic films with and without holes," Opt. Express 11, 482-490 (2003), <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-5-482">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-5-482</a>. [CrossRef] [PubMed]
  13. A. Agrawal, H. Cao, and A. Nahata, "Time-domain analysis of enhanced transmission through a single subwavelength aperture," Opt. Express 13, 3535-3542 (2005), <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-13-9-3535">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-13-9-3535</a>. [CrossRef] [PubMed]
  14. D. Grischkowsky, in Frontiers in Nonlinear Optics, edited by H. Walther, N. Koroteev, and M.O. Scully (Institute of Physics Publishing, Philadelphia, 1992) and references therein.
  15. D. Qu, D. Grischkowsky, and W. Zhang, “Terahertz transmission properties of thin, subwavelength metallic hole arrays,” Opt. Lett. 29, 896-898 (2004). [CrossRef] [PubMed]
  16. D. Qu, D. Grischkowsky, “Observation of a new type of THz resonance of surface plasmons propagating on metal-film hole arrays,” Phys. Rev. Lett. 93, 196804/1-4 (2004). [CrossRef] [PubMed]

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