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Loss and back-coupling effects on subwavelength imaging of three-dimensional superlens |
Optics Letters, Vol. 37, Issue 12, pp. 2262-2264 (2012)
http://dx.doi.org/10.1364/OL.37.002262
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Abstract
The loss and back-coupling effects on the subwavelength imaging of three-dimensional superlens are reported in this paper. The loss is added in the image region of a superlens. The back-coupling effects are considered by adding a shielded layer above the object region. (1) By adding loss in the image region, the long range plasmon mode is drastically suppressed. (2) The back-coupling shield above the objects has the effects of amplifying the higher spatial frequency components while suppressing the long range plasmon mode. Because of (1) and (2), the transfer function becomes flatter. Subsequently, the finer resolution of images is obtained. This is confirmed by the field and intensity distribution generated by the horizontal magnetic dipoles and vertical electric dipoles located in the object region and the image intensity distributions of the patterned mask structures in the lithography.
© 2012 Optical Society of America
OCIS Codes
(100.6640) Image processing : Superresolution
(110.0110) Imaging systems : Imaging systems
(140.3610) Lasers and laser optics : Lasers, ultraviolet
(240.6680) Optics at surfaces : Surface plasmons
(110.4235) Imaging systems : Nanolithography
(050.6624) Diffraction and gratings : Subwavelength structures
ToC Category:
Imaging Systems
History
Original Manuscript: February 6, 2012
Revised Manuscript: April 14, 2012
Manuscript Accepted: April 16, 2012
Published: June 6, 2012
Citation
Haogang Wang, Leung Tsang, and Shaowu Huang, "Loss and back-coupling effects on subwavelength imaging of three-dimensional superlens," Opt. Lett. 37, 2262-2264 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-12-2262
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