Highly efficient blazed gratings based on gradient-comb-like units

Kun Tang, Chunyin Qiu, Jiuyang Lu, Manzhu Ke, Zhengyou Liu

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Here we propose a multi-scaled reflective grating with excellent blazed performance (nearly perfect blazed effect at the well-predicted frequency and orientation). The blazed grating consists of a periodical array of metallic super-cells, each made of several equal-distant subwavelength slits with linearly reduced depth. A simple model based on Huygens-Fresnel principle is established to forecast the microwave response for the incidence of different polarizations: for transverse-electric polarization, the structure provides only the ordinary total reflection (i.e., without orientation deflected); for transverse-magnetic (TM) polarization, the waves are deflected to specific orientation due to the linear phase delay of the slit exits. Similar design route can be extended to acoustic systems, considering the mathematic similarity between the acoustic wave and the electromagnetic wave of TM-polarization.

Original languageEnglish
Article number083106
JournalJournal of Applied Physics
Issue number8
StatePublished - 28 Aug 2015
Externally publishedYes

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