Abstract
In this paper, a method has been proposed for high efficiency unidirectional optical transmission diode at 1550 nm. We use a new composite structure, holographic polymer dispersed liquid crystal (H-PDLC) grating-photonic crystal (PC), to realize it. There exists the directional band gap for the PC structure in 1550 nm. Therefore, it is possible to use the H-PDLC Bragg grating to shift the incident angle to a particular value to satisfy the condition so that the PC energy band can be moved from the pseudo-band gap to the passband to achieve the purpose of unidirectional transmission optical diode with high-efficiency. So that when the 1550 nm beam diffracted from the H-PDLC grating to incident the PC structure, it will transmit the composite structure almost totally, but it will be completely none reflected from PC surface. The simulation results show that the forward transmittance is 94.1% and the backward transmittance is near 0. At the same time, H-PDLC grating provide a method to adjust the transmittance of the composite structure diode with its electrically-controlled characteristics. This composite structure design provides another efficient method for the realization of all-optical diodes in the field of optical communication.
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