Light Funneling Profile During Enhanced Transmission Through a Subwavelength Metallic Slit
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Abstract
The funneling profile of enhanced light transmission through a subwavelength slit in a perfect electric conductor is studied with finite-difference time-domain simulation. From the wave-charge interaction dynamics, it is found that the EM wave energy is funneled while charges are accumulated at the edges of the slit. The Poynting vector indicates a boundary within which the wave energy flows toward the slit. Therefore, a funneling profile is defined by this boundary; as the slit width and thickness determine the transmitted energy density, the size of the funneling area is a relevant quantity of major concern.
Keywords
Subwavelength slit Light funneling Fabry-Pérot resonanceNotes
Acknowledgments
The authors are grateful for support from Ministry of Science and Technology, Taiwan (MOST 104-2112-M-006-004-MY3) and computational resources at National Center for High-performance Computing (NCHC) of National Applied Research Laboratories (NARLabs) of Taiwan.
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