Abstract
The one-way devices in optical circuits are the key components just as the diodes in electric circuits, which allow the light going in only one direction. A novel one-way transmission structure is proposed which is a curved waveguide containing a confined photonic crystal. When the waveguide is made of perfect electric conductor, the exact calculation results demonstrate that the device shows excellent one-way properties. The forward transmissivity approaches 100% and the largest transmission ratio exceeds 100.92N, where N is the cell number of the photonic crystal in the structure. When the waveguide is made of real metal, the device also presents excellent one-way transmission properties, which can be confirmed by an approximate calculation as well as by the simulation. In working region, the lowest forward tranmissivity is about 30% and the largest one exceeds 70%. The highest transmission ratio exceeds 104.
Highlights
The optical circuits are of great importance to the modern optical communication technology
One of the key components is the one-way device, just as the diode working in the electric circuit
Another work proposed the structure of an epsilon-near-zero (ENZ) prism inserted in a metal slit,12 where the ENZ prism accomplished the mode generation and mode filtration in one step
Summary
The optical circuits are of great importance to the modern optical communication technology. We recall a one-dimensional (1-D) confined photonic crystal (PC) structure which was composed of the subwavelength metal slit filled periodically with two different dielectrics.. We recall a one-dimensional (1-D) confined photonic crystal (PC) structure which was composed of the subwavelength metal slit filled periodically with two different dielectrics.16 Such a device showed the band-gap structure for the transmission light. We proposed a novel one-way structure combined of a confined 1-D PC and curved slit (CS) (see Fig. 1), which, for convenience, named as a PCCS structure Such a structure exhibits excellent one-way properties compared with the state-ofthe-art, which includes the very high positive transmission (approaches 100% for perfect PCCS and 70% for real PCCS), the very high transmission ratio [104] and the very wide working frequency region (0.91 − 1.03μm). The idea of this structure will open a new way to design the practical one-way devices
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