POLARIZATION ROTATOR ASSEMBLY INCLUDING A SUBWAVELENGTH COMPOSITE PORTION

摘要

A polarization rotator assembly for rotating a polarization mode of an electromagnetic signal is provided. The polarization rotator assembly has a waveguiding structure of co-extensive first and second layers defining, successively, an input portion, a subwavelength composite portion and a polarization rotating portion. The subwavelength composite portion is formed by the first and second layers, where the second layer defines a subwavelength pattern. The polarization rotator portion is geometrically configured to rotate the polarization mode of the electromagnetic signal.

主权项

1. A polarization rotator assembly for rotating a polarization mode of an electromagnetic signal, the polarization rotator assembly comprising:
a waveguiding structure having co-extensive first and second layers and having a first height corresponding to the first layer and a second height corresponding to a superposition of the first and second layers, the waveguiding structure having a waveguiding axis and comprising successively therealong:
an input portion formed by the first layer;a subwavelength composite portion formed by the first and second layers, where the second layer defines a subwavelength pattern having a characteristic feature size which is less than half an effective wavelength of the electromagnetic signal when propagating therein; anda polarization rotator portion comprising at least the first and second layers and geometrically configured to rotate a polarization mode of the electromagnetic signal.