Single particle detection, manipulation and analysis with resonant optical trapping in photonic crystals
Single particle detection, manipulation and analysis with resonant optical trapping in photonic crystals
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DOI：
10.1039/c3lc50447f
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发表时间：
2013-01-01
期刊：
影响因子：
6.1
通讯作者：
Houdre, Romuald
中科院分区：
文献类型：
--
作者：
Descharmes, Nicolas;Dharanipathy, Ulagalandha Perumal;Houdre, Romuald
我们提出了一种基于二维光子晶体空腔的共振光阱机制。这种方法的好处，同时从共振性质和前所未有的领域重叠与被困标本。光子晶体结构在30 mm x 12 mm的光流控芯片中实现，该芯片由图案化的硅衬底和用于粒子注入和控制的微流控膜组成。首先，我们展示了永久捕获单个250和500 nm大小的粒子与子mW的功率。其次，粒子诱导腔模式的共振位移高达几个线宽。利用这种位移来检测陷阱内粒子的存在，并检索被捕获粒子的信息。单个光子晶体器件上的多个腔的可寻址性也被证明。
We demonstrate a resonant optical trapping mechanism based on two-dimensional hollow photonic crystal cavities. This approach benefits simultaneously from the resonant nature and unprecedented field overlap with the trapped specimen. The photonic crystal structures are implemented in a 30 mm x 12 mm optofluidic chip consisting of a patterned silicon substrate and an ultrathin microfluidic membrane for particle injection and control. Firstly, we demonstrate permanent trapping of single 250 and 500 nm-sized particles with sub-mW powers. Secondly, the particle induces a large resonance shift of the cavity mode amounting up to several linewidths. This shift is exploited to detect the presence of a particle within the trap and to retrieve information on the trapped particle. The individual addressability of multiple cavities on a single photonic crystal device is also demonstrated.