近年光學元件領域受到重視，本論文嘗試設計結構來達成光控制光的效果，由於兩束光的干涉需要一波導來傳遞，故我們由回顧文獻出發，了解穿隧與共振腔效應，接著我們嘗試利用這類型波導結構，來了解兩束電磁波在波導內干涉後的結果，包含相位，振幅調制並利用其特性設計應用元件。
結構設計是利用同一通道兩側輸入電磁波，再藉由穿隧效應將電磁波干涉後的結果在另一通道測得。在相位調制的結果得知當相位差為0時，兩電磁波產生建設性干涉，穿透率幾乎可達100%，而隨著相位差遞增至π，兩電磁波產生破壞性干涉，穿透率逐漸下降，最低到達0.12%。而由以上結果可以利用波包訊號與連續訊號產生破壞性干涉，並抵銷其振幅，輸入一波包即會在輸出端得到一個〝零〞訊號形成反閘的效果。

As we know, light beams traveling in a linear medium will pass though one another without mutual disturbance. Indeed,the field of photonics is based on the premise that controlling light signals with light requires intense laser fields to facilitate beam interactions in nonlinear media, where the superposition principle can be broken. Here we demonstrate that two coherent beams of light can interact on tunneling position of structures in such a way that one beam modulates the intensity of the other. Applications of this phenomenon may lie in coherence filters and logic gate.

Structure is composed of two waveguide and a cavity.Input light beam on both sides of a waveguide then the interference of beams transfer to another waveguide by the cavity. The results of phase modulation is that when the phase difference is zero,this two electromagnetic wave generating constructive interference.The tunneling position is antinode,that energy can be transferred to another waveguide, the transmittance almost 100%. When the phase difference increased to π, the electromagnetic wave generating destructive interference. The tunneling position is node,that energy can not be transferred to another waveguide ,the minimum of transmittance is 0.12%. Based on the above results, we can use wave packet signal and continuous signal generating destructive interference. Therefore, input a wave packet will be a "zero" signals.

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