Design of a high-performance optical tweezer for nanoparticle trapping
Design of a high-performance optical tweezer for nanoparticle trapping
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DOI：
10.1007/s00339-016-9894-0
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
D. Conteduca;F. Dell’Olio;C. Ciminelli;T. Krauss;M. Armenise
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文献类型：
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作者：
D. Conteduca;F. Dell’Olio;C. Ciminelli;T. Krauss;M. Armenise
集成的光学纳米镊子提供了一种新的光阱范例，因为它们将光限制在纳米级的能力导致了极高的梯度力。迄今为止，纳米镊子已经实现为光子晶体或等离子体纳米腔。在这里，我们提出了一个nanotweezer设备的基础上的混合光子/等离子体腔的目标是实现一个非常高的品质因数模式体积（Q/V）比。该结构包括垂直耦合到蝴蝶结纳米天线的1D光子晶体电介质腔。用三维有限元方法计算了在λR= 1381.1 nm处的高Q/V~ 107（λ/n）-3，共振透过率T = 29%，提供了强的光-物质相互作用，使混合腔适合于光阱。对于直径为40 nm的聚苯乙烯纳米颗粒，当输入功率Pin = 1 mW时，获得了最大光学力F =-4.4 pN，高稳定性S = 30，光学刚度k = 90 pN/nm W。这一性能证实了光学纳米镊子的高效率及其在纳米级捕获生物物质（如病毒、蛋白质和小细菌）的潜力。
Integrated optical nanotweezers offer a novel paradigm for optical trapping, as their ability to confine light at the nanoscale leads to extremely high gradient forces. To date, nanotweezers have been realized either as photonic crystal or as plasmonic nanocavities. Here, we propose a nanotweezer device based on a hybrid photonic/plasmonic cavity with the goal of achieving a very high quality factor-to-mode volume (Q/V) ratio. The structure includes a 1D photonic crystal dielectric cavity vertically coupled to a bowtie nanoantenna. A very highQ/V~ 107(λ/n)−3with a resonance transmissionT= 29 % atλR= 1381.1 nm has been calculated by 3D finite element method, affording strong light–matter interaction and making the hybrid cavity suitable for optical trapping. A maximum optical forceF= −4.4 pN, high values of stabilityS= 30 and optical stiffnessk= 90 pN/nm W have been obtained with an input powerPin= 1 mW, for a polystyrene nanoparticle with a diameter of 40 nm. This performance confirms the high efficiency of the optical nanotweezer and its potential for trapping living matter at the nanoscale, such as viruses, proteins and small bacteria.