Abstract

In this Letter we investigate the subwavelength imaging of a three-dimensional plasmon superlens based on the full vector wave simulations of optical wave propagation and transmission. The optical transfer functions are computed. Comparisons are made between the results of lenses with flat and periodic/random rough surfaces. We also study the problem of practical imaging system geometry using laser as an illumination source. Results show that the lens with periodic or random roughness can reduce the field interference effects, and provide improved focus on the transmission field and the Poynting flux. We illustrate that the subwavelength roughness in a plasmon lens can enhance the image resolution over a flat lens for both matched and unmatched permittivity conditions. The enhancement of resolution occurs because the introduced subwavelength roughness can amplify the evanescent wave components and suppress the surface plasmon resonance peaks.

© 2012 Optical Society of America

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References

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  1. J. B. Pendry, Phys. Rev. Lett. 85, 3966 (2000).
    [CrossRef]
  2. N. Fang, H. Lee, C. Sun, and X. Zhang, Science 308, 534 (2005).
    [CrossRef]
  3. J. Q. Bagley, L. Tsang, K.-H. Ding, and A. Ishimaru, J. Opt. Soc. Am. B 28, 1766 (2011).
    [CrossRef]
  4. H. Wang, J. Q. Bagley, L. Tsang, S. Huang, K.-H. Ding, and A. Ishimaru, J. Opt. Soc. Am. B 28, 2499 (2011).
    [CrossRef]

2011 (2)

2005 (1)

N. Fang, H. Lee, C. Sun, and X. Zhang, Science 308, 534 (2005).
[CrossRef]

2000 (1)

J. B. Pendry, Phys. Rev. Lett. 85, 3966 (2000).
[CrossRef]

Bagley, J. Q.

Ding, K.-H.

Fang, N.

N. Fang, H. Lee, C. Sun, and X. Zhang, Science 308, 534 (2005).
[CrossRef]

Huang, S.

Ishimaru, A.

Lee, H.

N. Fang, H. Lee, C. Sun, and X. Zhang, Science 308, 534 (2005).
[CrossRef]

Pendry, J. B.

J. B. Pendry, Phys. Rev. Lett. 85, 3966 (2000).
[CrossRef]

Sun, C.

N. Fang, H. Lee, C. Sun, and X. Zhang, Science 308, 534 (2005).
[CrossRef]

Tsang, L.

Wang, H.

Zhang, X.

N. Fang, H. Lee, C. Sun, and X. Zhang, Science 308, 534 (2005).
[CrossRef]

J. Opt. Soc. Am. B (2)

Phys. Rev. Lett. (1)

J. B. Pendry, Phys. Rev. Lett. 85, 3966 (2000).
[CrossRef]

Science (1)

N. Fang, H. Lee, C. Sun, and X. Zhang, Science 308, 534 (2005).
[CrossRef]

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Figures (5)

Fig. 1.
Fig. 1.

(a) Diagram of a 2-D plasmon lens system with a horizontal magnetic line source as the object; the top surface has a sinusoidal height function z=Hsin(2πx/P). (b) MTFs for both matched and unmatched lenses. (c) Normalized magnitudes of transmission H fields for both matched and unmatched lenses.

Fig. 2.
Fig. 2.

Diagrams of two 3-D plasmon superlens systems. (a) An ideal system with point sources and (b) a realistic system illuminated by a laser.

Fig. 3.
Fig. 3.

Co-polarized transfer functions of three dipole sources as a function of kx/2π (ky=0) for (a) an unmatched flat lens and (b) an unmatched periodic lens.

Fig. 4.
Fig. 4.

Normalized |Hx| and Sz for single HMD illumination. (a) |Hx| for an unmatched flat lens, (b) |Hx| for an unmatched periodic lens, (c) |Hx| for an unmatched random lens, (d) Sz for an unmatched flat lens, (e) Sz for an unmatched periodic lens, and (f) Sz for an unmatched random lens.

Fig. 5.
Fig. 5.

Coherent imaging using the lens system shown in Fig. 2(b); the normalized time-averaged Poynting vector Sz is computed. (a) The binary object function consists of a letter A, 3λ×4.5λ, and an array of 10 slots in which the top five slots are 0.3λ apart and the bottom five slots are 0.2λ apart. The linewidth of the object is 0.05λ. The slot length is 1.875λ. (b) Sz for an unmatched flat lens, (c) Sz for an unmatched periodic lens, (d) Sz for a matched flat lens, (e) Sz for a lossy matched flat lens, and (f) Sz for a lossy matched sinusoidal lens.

Equations (1)

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S¯=12πObjectdsi=13Gi2EM(r¯,r¯;ωc)A(r¯)×Objectdsk=13Gk2*HM(r¯,r¯;ωc)A(r¯)(e^i×e^k),

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