Evaluation of slot-to-slot coupling between dielectric slot waveguides and metal-insulator-metal slot waveguides
Evaluation of slot-to-slot coupling between dielectric slot waveguides and metal-insulator-metal slot waveguides
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DOI：
10.1364/oe.23.019082
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发表时间：
2015-07-27
期刊：
影响因子：
3.8
通讯作者：
Tsubokawa, Makoto
中科院分区：
文献类型：
--
作者：
Kong, Deqing;Tsubokawa, Makoto
数值分析了高折射率对比度介质缝隙波导和金属-绝缘体-金属(MIM)等离子体缝隙波导之间的功率耦合特性随结构参数的变化。当两个波导的缝隙宽度相同时，主要是由于两个波导中的逝去分量的传输而产生的耦合产生了高的传输效率，当两个波导的缝隙宽度相同时，传输效率为62%，而当两个波导的宽度略有不同时，传输效率为73%。缝隙间耦合的最大传输效率比普通平板光波导和MIM光波导之间的传输效率高出约10%。同时也证明了槽间耦合具有较大的对准公差。此外，插入到两个波导之间的界面的小间隙有效地提高了传输效率，就像在普通平板波导和MIM波导之间耦合的情况一样。此外，还验证了在几百纳米波长范围内具有超宽带传输的耦合。(C)2015年美国光学学会
We numerically analyzed the power-coupling characteristics between a high-index-contrast dielectric slot waveguide and a metal-insulator-metal (MIM) plasmonic slot waveguide as functions of structural parameters. Couplings due mainly to the transfer of evanescent components in two waveguides generated high transmission efficiencies of 62% when the slot widths of the two waveguides were the same and 73% when the waveguides were optimized by slightly different widths. The maximum transmission efficiency in the slot-to-slot coupling was about 10% higher than that in the coupling between a normal slab waveguide and an MIM waveguide. Large alignment tolerance of the slot-to-slot coupling was also proved. Moreover, a small gap inserted into the interface between two waveguides effectively enhances the transmission efficiency, as in the case of couplings between a normal slab waveguide and an MIM waveguide. In addition, couplings with very wideband transmissions over a wavelength region of a few hundred nanometers were validated. (C) 2015 Optical Society of America