Subwavelength imaging with two dielectric planar waveguides

Min Cheng; Yuliang Li; Xiyao Chen; Yingwu Zhou; Xuemei Li

doi:10.1117/12.790824

22 February 2008 Subwavelength imaging with two dielectric planar waveguides

Min Cheng, Yuliang Li, Xiyao Chen, Yingwu Zhou, Xuemei Li

Proceedings Volume 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology; 662218 (2008) https://doi.org/10.1117/12.790824
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

Abstract

In this paper, we investigate the possibility of superlensing with two dielectric planar waveguides in detail by studying the transmission of evanescent waves through one double-waveguide structure. We derive the total transmission and reflection coefficients for the double-waveguide structure. It is found that when one field component of an evanescent wave coincides with one of the single-waveguide bound-state eigenvalues, the total transmission increases exponentially with respect to the distance between two dielectric planar waveguides, and zero reflection can be found. An important interplay between propagating waves and evanescent waves on image formation is revealed, which makes the appearance of the image of a superlens substantially different from that of a real image behind a free space. We derive the resolution of the double-waveguide structure and infer that resolution arbitrarily smaller than the wavelength should be possible in principle, provided that sufficiently high dielectric contrast of two waveguides can be obtained. The numerical results confirm the qualitative discussions in this paper.

Citation Download Citation

Min Cheng, Yuliang Li, Xiyao Chen, Yingwu Zhou, and Xuemei Li "Subwavelength imaging with two dielectric planar waveguides", Proc. SPIE 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology, 662218 (22 February 2008); https://doi.org/10.1117/12.790824

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KEYWORDS

Dielectrics

Waveguides

Planar waveguides

Wave propagation

Photonic crystals

Refractive index

Image acquisition

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