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Metasurfaces have drawn much attention in optics and nanophotonics due to the powerful capability of full control of light. We introduce nanosieve based metasurfaces for realizing optical holograpy and multiple-dimensional information encryption.
A new low-cost design of four-port optical circulator is proposed. By introduction of two pairs of confocal cylindrical lenses, a small size Faraday rotator is required. A prototype of the device was assembled and tested.
This letter proposes a simplified design of multiport optical circulator with parallel connection of mirror-image arranged spatial- and polarization-modules. To show the feasibility of the design, a prototype of six-port optical circulator was fabricated. The insertion losses are 0.51–1.05 dB, the isolations are 26.20–45.13 dB, and return losses are 27.72 dB. This design should bear merits of a simple...
An alternative design of crystal type multi-port optical quasi-circulator is proposed. A prototype of 6-port optical quasi-circulator was fabricated and tested with insertion losses of about 1.93 dB and isolations of about 49.5 dB.
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