Silalahi Harry Miyosi, Tsai Yu-Hsuan, Lee Kuang-Li, Wei Pei-Kuen, Huang Chia-Yi
Opt Lett. 2021 Feb 15;46(4):705-708. doi: 10.1364/OL.415500.
A simple design for shifting the resonance wavelength of silver nanoslits using an electrowetting-on-dielectric (EWOD) cell is proposed. The EWOD cell comprises a polycarbonate (PC) substrate with Teflon-coated silver nanoslits and a glass substrate with Teflon-coated electrodes. A glycerol droplet is placed between the two substrates, and out of the path of a probe beam at zero electric field. Application of an electric field smaller than 0.3 V/µm on the electrodes moves the glycerol droplet into the path of the probe beam, shifting the resonance wavelength of the silver nanoslits by 135 nm. A change (0.33) in the refractive index of the effective medium that is adjacent to the silver nanoslits causes a large shift in the resonance wavelength. The spectral shift of the silver nanoslits is repeatable by the electric field. This simple design is a great achievement for high-performance electro-optical devices with large wavelength shift ranges such as optical switches, variable optical attenuators, and sensor applications.
提出了一种使用介电层上电润湿（EWOD）单元来改变银纳米狭缝共振波长的简单设计。该EWOD单元包括一个带有涂有特氟龙的银纳米狭缝的聚碳酸酯（PC）基板和一个带有涂有特氟龙的电极的玻璃基板。在零电场下，一个甘油液滴放置在两个基板之间且不在探测光束的路径上。在电极上施加小于0.3 V/µm的电场会使甘油液滴移动到探测光束的路径中，从而使银纳米狭缝的共振波长移动135 nm。与银纳米狭缝相邻的有效介质的折射率变化（0.33）会导致共振波长发生很大的移动。银纳米狭缝的光谱移动可通过电场重复实现。这种简单的设计对于具有大波长移动范围的高性能电光器件，如光开关、可变光衰减器和传感器应用而言，是一项重大成就。
