NDLI: A Novel Plasmonic Zone Plate Lens Based on Nano-Slits with Refractive Index Modulation

Content Provider	Springer Nature Link
Author	Chen, Qin
Copyright Year	2011
Abstract	Conventionally, plasmonic lenses introduce a phase delay distribution across their surfaces by modulating the dimensions of nanostructures within a metal film. However, there is very limited modulation of the phase delay due to the small dependence of the mode propagation constant on the structure dimensions. In this paper, a novel design of plasmonic zone plate lenses (PZPL) with both slit width and refractive index modulation is proposed to enable integrating more slits in a fixed lens aperture with the extended phase delay range and, therefore, greatly enhance the performance of the devices. More than three-time enhancement of the light intensity at the focus is achieved compared to the structure with only slit width modulation. Like a conventional immersion system, a PZPL embedded in a dielectric is found to have a further improved focusing performance, where light is focused down to a 0.44λ spot using a PZPL with an aperture of 12λ and a focal length of 6λ. Dispersive light-focusing behaviour is also analysed and the modulation of the focal length by colour has a potential application in stacked image sensors and multi-dimensional optical data storage.
Starting Page	381
Ending Page	385
Page Count	5
File Format	PDF
ISSN	15571955
Journal	Plasmonics
Volume Number	6
Issue Number	2
e-ISSN	15571963
Language	English
Publisher	Springer US
Publisher Date	2011-03-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plasmonic lens Zone plate Surface plasmons Superfocusing Imaging Subwavelength structures Nanotechnology Biotechnology Biochemistry Biophysics and Biological Physics
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Biochemistry Biophysics Biotechnology

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