Research On Optical Properties Of Micro-ring Resonator Based On Surface Plasmon Polaritons

Surface plasmon polaritons(SPPs) has many prominent features such as near-fieldaggregation, transmission enhancement, ultra-high resolution imaging and so on, using surfaceplasmon to develop small-size photonic device has obvious advantages. In recent years, thesurface plasmon has been used in optical waveguide devices, biosensors, super-resolutionimaging and other related fields, study on SPPs is becoming a new hot spot.In this paper, using the special nature of the surface of the plasma, we have designed aelliptical resonant ring WDM devices, by adding the long straight waveguide to improve dualchannel coupled ring resonator to increase the coupling efficiency and enhance the effect ofpartial wave . this paper focuses on the length of the model coupling devices, coupling spacing,radius of circular waveguide coupling which can effect the device's performance. Throughanalysis, the longer of the coupling length, the higher effective role of waveguide will display, thehigher coupling efficiency will performance; With the change in coupling length, the ring pathdifference of the ring resonator devices will changes, lead to the coupling wavelength change. Theresults show that changes in the radius of the ring waveguide will also affect the ring's pathdifference, and then rise to cyclical changes of the coupling wavelength; circular waveguideradius is larger, the peak absorption will be lower, the absorption peak spacing (free spectral range)will be smaller. For the coupled pitch selection, analysis obtained when the spacing in the25-35nm is better, too much is a serious loss, is too small will increase the non-resonanttransmission of light. Compare with Coupling length's influence to the resonant wavelength,relying on changing the coupling length to control the resonance wavelength is better thanchanging the radius of the waveguide, which also shows the advantages of the proposed model .Finally, this paper discussed when the coupling length is 1.2 , the coupling interval is 25nm, the circular waveguide radius is 1.0 , the MDM partial wave resonant ring effect, and itsfree spectral range of 50nm,-3dB bandwidth is about 6nm, the output port insertion loss is lessthan 1.5dB.