Volume 85, Number 2, January 2009
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||30 January 2009|
Multi-reflection process of extraordinary optical transmission in a single subwavelength metal slit
Department of Physics, Capital Normal University - Beijing 100048, China
2 Institute of Physics, Chinese Academy of Sciences - P.O. Box 603, Beijing 100080, China
3 Department of Physics, Tsinghua University - Beijing 100084, China
4 Laboratory of Photonic Information Technology School for Information and Optoelectronic Science and Engineering - Guangzhou, Guangdong 510006, China
Accepted: 29 December 2008
The process of the light passing through a single subwavelength metal slit is analyzed by the finite-difference time-domain method. The simulation results show that the slit can be considered as an effective dielectric region sandwiched by two scattering regions at the two slit ends. Thus, the slit is analogous to a Fabry-Perot (FP) etalon consisting of a dielectric slab with high-reflection coatings on its two surfaces. A formula is presented to evaluate the phase shift caused by the amplitude transmissivity of the coatings.
PACS: 42.79.Dj – Gratings / 78.66.Bz – Metals and metallic alloys / 42.25.Hz – Interference
© EPLA, 2009
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