Abstract：
:Manipulating the polarization states of electromagnetic (EM) waves, a fundamental issue in optics, attracted intensive attention recently. However, most of the devices realized so far are either too bulky in size, and/or are passive with only specific functionalities. Here we combine theory and experiment to demonstrate that, a tunable metasurface incorporating diodes as active elements can dynamically control the reflection phase of EM waves, and thus exhibits unprecedented capabilities to manipulate the helicity of incident circular-polarized (CP) EM wave. By controlling the bias voltages imparted on the embedded diodes, we demonstrate that the device can work in two distinct states. Whereas in the "On" state, the metasurface functions as a helicity convertor and a helicity hybridizer within two separate frequency bands, it behaves as a helicity keeper within an ultra-wide frequency band in the "Off" state. Our findings pave the way to realize functionality-switchable devices related to phase control, such as frequency-tunable subwavelength cavities, anomalous reflectors and even holograms.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Xu HX,Sun S,Tang S,Ma S,He Q,Wang GM,Cai T,Li HP,Zhou Ldoi
10.1038/srep27503subject
Has Abstractpub_date
2016-06-08 00:00:00pages
27503issn
2045-2322pii
srep27503journal_volume
6pub_type
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