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Applied Physics Letters / Volume 91 / Issue 9 / NANOSCALE SCIENCE AND DESIGN

Appl. Phys. Lett. 91, 093111 (2007); http://dx.doi.org/10.1063/1.2776875 (3 pages)

Focal length modulation based on a metallic slit surrounded with grooves in curved depths

Haofei Shi, Chunlei Du, and Xiangang Luo

State Key Laboratory of Optical Technologies for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, Sichuan Province 610209, People’s Republic of China

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(Received 25 April 2007; accepted 7 August 2007; published online 29 August 2007)

According to the numerical calculation, the relative phase of emitting light scattered by surface plasmon in a single subwavelength metallic groove can be modulated by the groove depth. The focal length of the slit-groove-based focusing structures can be adjusted in certain value if the groove depths are arranged in traced profile. With the regulation of the groove depth profile, it is possible to modify the focus position in the precision of nanoscale without increasing the size of the nanodevice. The simulation results verify that the method is effective for the design of nano-optical devices such as optical microprobes.

© 2007 American Institute of Physics

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KEYWORDS and PACS

Keywords

light scattering, optical focusing, optical modulation, surface plasmons

PACS

  • 78.68.+m

    Optical properties of surfaces

  • 73.20.Mf

    Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

  • 78.20.Ci

    Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2776875

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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