Optical Dielectrophoretic (DEP) Manipulation of Oil-Immersed Aqueous Droplets on a Plasmonic-Enhanced Photoconductive Surface.
Optical Dielectrophoretic (DEP) Manipulation of Oil-Immersed Aqueous Droplets on a Plasmonic-Enhanced Photoconductive Surface.
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DOI：
10.3390/mi13010112
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发表时间：
2022-01-11
期刊：
影响因子：
3.4
通讯作者：
Park SY
中科院分区：
文献类型：
--
作者：
Thio SK;Park SY
我们提出了一种等离子体增强介电泳（DEP）现象，以提高浮动电极光电子镊子（FEOET）设备，其中水液滴可以有效地操纵光图案化的光电导表面浸在油介质中的光学DEP性能。为了提供设备的简单性和成本效益，最近的研究已经利用了基于聚合物的光电导材料，如氧化钛酞菁（TiOPc）。然而，TiOPc具有比半导体如非晶硅（a-Si）差得多的光电导性，显著限制了光学DEP应用。本文的研究集中在FEOET设备，其中光学DEP性能可以大大提高，通过利用等离子体纳米粒子作为光散射元件，以提高低质量的TiOPc的光吸收。进行了等离子体光散射和电场增强的数值模拟研究，以验证广角散射光线和存在纳米颗粒的电场梯度的大约两倍的增加。同样，对TiOPc吸收光谱进行的分光光度研究表明TiOPc层的光吸收改善（几乎两倍）。此外，液滴动力学研究实验证明了1.90 mm/s的光致动液滴速度，由于等离子体光散射而提高了11倍以上。这种等离子体增强的FEOET技术即使使用质量差的光电导材料也可以显著提高光学DEP能力，从而为各种基于液滴的微流体应用提供低成本，易于制造的解决方案。
We present a plasmonic-enhanced dielectrophoretic (DEP) phenomenon to improve optical DEP performance of a floating electrode optoelectronic tweezers (FEOET) device, where aqueous droplets can be effectively manipulated on a light-patterned photoconductive surface immersed in an oil medium. To offer device simplicity and cost-effectiveness, recent studies have utilized a polymer-based photoconductive material such as titanium oxide phthalocyanine (TiOPc). However, the TiOPc has much poorer photoconductivity than that of semiconductors like amorphous silicon (a-Si), significantly limiting optical DEP applications. The study herein focuses on the FEOET device for which optical DEP performance can be greatly enhanced by utilizing plasmonic nanoparticles as light scattering elements to improve light absorption of the low-quality TiOPc. Numerical simulation studies of both plasmonic light scattering and electric field enhancement were conducted to verify wide-angle scattering light rays and an approximately twofold increase in electric field gradient with the presence of nanoparticles. Similarly, a spectrophotometric study conducted on the absorption spectrum of the TiOPc has shown light absorption improvement (nearly twofold) of the TiOPc layer. Additionally, droplet dynamics study experimentally demonstrated a light-actuated droplet speed of 1.90 mm/s, a more than 11-fold improvement due to plasmonic light scattering. This plasmonic-enhanced FEOET technology can considerably improve optical DEP capability even with poor-quality photoconductive materials, thus providing low-cost, easy-fabrication solutions for various droplet-based microfluidic applications.
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影响因子：
4.1
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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