Abstract：
:We propose and demonstrate a type of a broadband half-wave plate that operates in the reflective mode. It consists of a metal grating embedded in a dielectric slab and placed on top of a grounded metal surface. We theoretically show that owing to the optical feedback effect which originates from the wave reflections at the air-dielectric interface, the proposed half-wave plate exhibits a broadened and flattened response when comparing to the case where the feedback effect is absent. Such a prediction is validated using both numerical and experimental works carried out on a half-wave plate designed at 10 GHz. Moreover, our theoretical analysis also reveals that the half-wave plate has an interesting feature of broad angular response. Taking advantage of these features, we experimentally demonstrate that the proposed device can function as a freely tunable linear polarization converter with polarization conversion residues less than -20 dB in a wide frequency band, under the condition that the incident angle is as large as 45 degrees.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Zhou G,Zhu B,Zhao J,Zhu G,Jin B,Feng Y,Kang L,Xu W,Chen J,Wu Pdoi
10.1038/s41598-017-09561-ysubject
Has Abstractpub_date
2017-08-22 00:00:00pages
9103issue
1issn
2045-2322pii
10.1038/s41598-017-09561-yjournal_volume
7pub_type
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