| AVS 63rd International Symposium & Exhibition | |
| Nanometer-scale Science and Technology | Tuesday Sessions |
| Session NS-TuP |
| Session: | Nanometer-scale Science & Technology Poster Session |
| Presenter: | Cheng-Hung Hsieh, National Tsing Hua University |
| Authors: | C.H. Hsieh, National Tsing Hua University C.M. Kuo, National Tsing Hua University M.J. Huang, Naitoal Tsing Hua University R.J. Sun, National Tsing Hua University K.C. Leou, National Tsing Hua University, Taiwan, Republic of China |
| Correspondent: | Click to Email |
Here we present the design of several plasmonic optical devices which have gained a great deal of attention recently for potential application in nano photonic circuits. A unique ultra low loss surface plasmon polariton (SPP) waveguide, top metal silicon (Si) hybrid dielectric-loaded plasmonic waveguide (TM-SiHDLW), was first designed. The waveguide adopted a top metal stripe structure for easier process integration with conventional micro fabrications and a thick (200 nm) metal stripe was found to yield optimal performance due to reduced Ohmic loss in conductor around the stripe edge/corner. Moreover, a relatively thick (150 nm) dielectric spacer between the Si ridge and the metal stripe was employed to achieve both long propagation length and good field confinement. Results from numerical simulation show that a long propagation length of 350 μm and a small mode area of 0.03 m2 are obtained. The TM-SiHDLW structure was also adopted for design of several compact high performance plasmonic optical devices, including a directional coupler, a disk resonator and an switch. The directional coupler adopted a coupled waveguide structure. A coupling length as low as 2.95 μm, only ~ 0.85% of the propagation length, was obtained. The second device is a disk resonator operating at the low loss TE mode. Simulation results demonstrate that a quality factor as high as 2000 can be achieved at a size much smaller than that of a conventional ring resonator. Another plasmonic optical device we have explored was an electro-optical (E-O) switch where an organic E-O material was chosen for low switching voltage along with having a better compatibility with conventional microfabrication processes. The switch we proposed employed a coupled waveguide structure configured in a way that the optical wave can be switched between to two waveguides, depending on the voltage applied on the switch electrodes. All these SPP waveguides and devices were designed to operate at the standard 1550 nm wavelength.
* Work supported by the Ministry of Science and Technology of ROC. The authors also thank the “National Center for High-Performance Computing” of ROC for providing simulation code.
References
1) C. H. Hsieh, et al., IEEE Photon. Technol. Lett, (2015) 27(10), 1096-1099.
2) C. H. Hsieh, et al., IEEE Photon. Technol. Lett, (2015), 27(23), 2473-2476.