New design of all-optical devices based on Kerr-type nonlinear metal-insulator-metal surface plasmonic waveguide structures

• Main Authors: Guan-Yu Jhan, 趙冠羽
• Other Authors: Yaw-Dong Wu
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/80018304363716148116

碩士 === 國立高雄應用科技大學 === 電子工程系碩士班 === 103 === In this thesis, we discussed the properties of surface plasmonic waveguide devices. We analyze the Kerr type nonlinear material waveguide structures based on the metal-insulator-metal (MIM) plasmonic waveguides. Nonlinear material means that the refractive indices of the material will change with the electric field intensity. First, we use the nano-disk resonators to design the all-optical logic gates. By properly adjusting the radii of the nano-disk resonators and the width of the coupled-aperture, we can filter out certain wavelengths. We introduce the nonlinear material to the nano-disk resonators, and change the input light intensity. Based on the Kerr-type nonlinear nano-disk resonators, the new all-optical logic gates have been proposed. The transmission efficiency of the high logic state is about 94% and low logic state is 0.002%. Next, we can add the number of nano-disk resonators to obtain the wider band-stop and to design all logic gates. For the proposed AND gate logic gate, the normalized transmission efficiency of the high logic state is about 94.5% and the low logic state is 0.002%. For the proposed OR logic gate, the normalized transmission efficiency of the high logic state is about 95.4% and the low logic state is 0.002%. For the proposed NOR logic gate, the normalized transmission efficiency of the high logic state is about 97.4% and the low logic state is 0.003%. For the proposed XNOR logic gate, the normalized transmission efficiency of the high logic state is about 97.4% and the low logic state is 0.004%. For the proposed NAND logic gate, the normalized transmission efficiency of the high logic state is about 97.3% and the low logic state is 0.002%. And for the proposed XOR logic gate, the normalized transmission efficiency of the high logic state is about 97.3% and the low logic state is 0.002%. Finally, we use the triangle-teeth-shaped resonators filled with the Kerr-type nonlinear medium to design an all-optical triplexer. By properly adjusting the height of the triangle-teeth-shaped resonators and the coupling distances, the proposed metal-insulator-metal (MIM) plasmonic waveguide structures could filter out certain wavelengths. It can be used to design a novel all-optical triplexer which can filter out the optical communication wavelengths 1310nm、1490nm, and 1550nm, respectively. Those wavelengths could be used in fiber-to-the-home system (FTTH) with the transmission efficiency higher than 90%. The proposed all-optical plasmonic MIM waveguide structures would be potential key components in the application of ultra-high-speed, ultra-high-capacity optical communications and optical signal processing systems.