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Beyond-limit light focusing in the intermediate zone |
Optics Letters, Vol. 36, Issue 23, pp. 4497-4499 (2011)
http://dx.doi.org/10.1364/OL.36.004497
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Abstract
We experimentally verify that a new nanolens of a designed plasmonic aperture can focus visible light to a single line with its width smaller than the limit of half the wavelength in the intermediate zone. The experimental measurement indicates that while the near field plays a role to increase the spot size in the near zone, it is negligible at the beyond-limit focused region; i.e., the focused light is dominated by the radiative fields. The image taken by the optical microscope shows that the fields focused have propagated to the far zone. Besides being of academic interest, the nanolens capable in achieving a lower diffraction limit in the intermediate zone is important for application possibilities.
© 2011 Optical Society of America
OCIS Codes
(100.6640) Image processing : Superresolution
(050.1965) Diffraction and gratings : Diffractive lenses
(160.3918) Materials : Metamaterials
(180.4243) Microscopy : Near-field microscopy
(250.5403) Optoelectronics : Plasmonics
(050.6624) Diffraction and gratings : Subwavelength structures
ToC Category:
Diffraction and Gratings
History
Original Manuscript: August 31, 2011
Manuscript Accepted: September 20, 2011
Published: November 22, 2011
Virtual Issues
Vol. 7, Iss. 2 Virtual Journal for Biomedical Optics
Citation
K. R. Chen, W. H. Chu, H. C. Fang, C. P. Liu, C. H. Huang, H. C. Chui, C. H. Chuang, Y. L. Lo, C. Y. Lin, H. H. Hwung, and Andy Y.-G. Fuh, "Beyond-limit light focusing in the intermediate zone," Opt. Lett. 36, 4497-4499 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ol-36-23-4497
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