State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China.
Nano Lett. 2011 Jul 13;11(7):2933-7. doi: 10.1021/nl201401w. Epub 2011 Jun 16.
By engaging a compact asymmetric single slit coated with a photorefractive polymer, surface-plasmon-polariton (SPP) generation was efficiently controlled by a pump beam. In the structure, the nonlinear light-matter interaction is enhanced because of the cavity effect, which increases the sensitivity of SPPs to the surrounding dielectric. By variation of the real part of the refractive index together with an interferometric configuration, high on/off switching ratios are achieved. Moreover, the SPP generation and modulation processes are integrated in the same asymmetric single slit, which makes the device ultracompact. Experimentally, a high on/off switching ratio of >20 dB and phase variation of >π were observed with the device lateral dimension of only about 2 μm.
通过采用涂覆有光折变聚合物的紧凑型非对称单狭缝，可有效控制表面等离子体激元 (SPP) 的产生。在该结构中，由于腔效应增强了非线性光物质相互作用，提高了 SPP 对周围介电常数的灵敏度。通过改变折射率的实部并采用干涉配置，实现了高的开/关切换比。此外，SPP 的产生和调制过程集成在相同的非对称单狭缝中，使得器件超紧凑。实验上，该器件的横向尺寸仅约为 2μm 时，观察到>20dB 的高开/关切换比和>π的相位变化。
