Abstract In this study, we investigate an optical modulation of the focusing mirror based on photonic jet effect working in the reflection mode The photonic jet effects excited by surface plasmon polariton (SPP) in the near-field on the front-side of different core–shell micro-cuboids positioned on a substrate are presented. The core–shell micro-cuboid consists of a metallic shell (silver or gold) and a dielectric core (polydimethylsiloxane). The specific localized intensity distributions of the generated photonic jet at different core–shell micro-cuboids are simulated by using finite-difference time-domain technique. The experimental observations of focusing modulation are performed by a scanning optical microscope with oblique illumination. Due to the nature of SPP, the highly focused electric field near the metal–dielectric interface of the gold-coating micro-cuboids is enhanced by about 4 times. The generation of the focusing mirror based on SPP photonic jet can be flexibly controlled by varying the metallic shell. The controllable focusing mirror is a great possibility for integrated plasmonic circuits, surface optical tweezers, and biosensing.

中文翻译：

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表面等离子体激元激发的可控平面聚焦镜实验演示

摘要 在这项研究中，我们研究了一种基于光子射流效应的聚焦镜的光学调制在反射模式下工作 不同纤芯前侧近场中由表面等离子体激元 (SPP) 激发的光子射流效应 -展示了位于基板上的壳微长方体。核壳微长方体由金属壳（银或金）和介电核（聚二甲基硅氧烷）组成。通过使用有限差分时域技术模拟了在不同核壳微长方体上产生的光子射流的特定局部强度分布。聚焦调制的实验观察是通过倾斜照明的扫描光学显微镜进行的。由于 SPP 的性质，镀金微立方体的金属-电介质界面附近的高度聚焦电场增强了约 4 倍。基于SPP光子射流的聚焦镜的产生可以通过改变金属外壳来灵活控制。可控聚焦镜为集成等离子体电路、表面光镊和生物传感提供了极大的可能性。