Modes Property And Polarization Conversion Of2-D Waveguide Structure Based On Chiral Media

The explosive demand for data transmission has extremely accelerated thedevelopment of optical transmission and processing technology. Now it seems thatmaking the use of polarization to transfer information is the inevitable trend of futureresearch. Based on optical active chiral material, photonic structrue could control thepolarization of light. Therefore, to study on chiral-based photonic devices is of greatsignificance to futrue technology, such as all-optical polarization multiplexing systems.In our paper, we explored the polarization manipulation by introducing chiralmedia into our structure. With the Double-Grid-FDTD method, the mode property ofplanar waveguide and2D photonic crystal based on chiral media has been discussed.Details are as follows:We picked the non-dispersive2D DG-FDTD method as the effective tool forfarther research of complex photonic structure, and confirmed the validity of thismethod under time-harmonic assumption. After that, the recursive form of2D-DG-FDTD method has been constructed, so has the overlaid absorbing boundaryconditions. The stability condition has been confirm, and some other importantconditions. Finally the program of the method has been successfully realized and tested.The2D planar waveguide is the most basic element among varies devices. Theway it affect light also reflected in other structures. In our paper, we obtained both therigorous field distribution and the numerical simulation result of the planarchirowaveguide. And explained from both eigen-mode superposition theory andcoupled mode theory. After this, we designed a period chiral structure which realizedTE—TM mode conversion. The relevant property has been analyzed.Based on previous discussion, we proposed a relatively complex and strongscattering structure——chiral introduced photonic crystal. The condition theself-collimation beam could exist in chiral photonic crystal has been found. The basicway to split the different polarization mode has been discussed. We designed two kindsof the period chiral introduced photonic crystal module and realized the polarizationmode conversion by numerical simulation.After the research of light propagation property in planar chirowaveguide and2Dchiral PC, a general conclusion has been summarized. The polarization modeconversion in period chiral structure, which been restricted in2D in-plane direction,could help estimate the light behavior in future polarization dependent and multiplexedoptical devices design.