AI Article Synopsis
- The study explores how metallic gratings with tiny slits can absorb light unusually well, achieving up to 99.5% absorbance particularly for TM polarization.
- Enhanced absorption is linked to intense field concentration within the structure, driven by surface plasmons at the interface.
- The research also shows that even a simpler grating can achieve significant absorption (98.4%) for TE polarization through the presence of trapped modes.
Article Abstract
The absorption in metallic gratings with subwavelength slits is theoretically investigated. Anomalous optical absorption occurs over a wide range of incident angles for both polarizations. In particular, a nearly perfect absorbance up to 99.5% with a significant bandwidth is attained for TM polarization with compound slits. Enhanced absorption is associated with extreme concentration of fields inside the structure. The respective field pattern depicts a special feature of surface plasmons excited on single interface only, which are identified as semibonding modes. The anomalous absorption is also achieved for TE polarization, when the compound grating is reduced to a simple grating. For this polarization, the nomalous absorption is attributed to the occurrence of trapped modes, with a slightly smaller absorbance (98.4%).
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| http://dx.doi.org/10.1364/OE.18.019510 | DOI Listing |
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