表面等离激元光镊技术

Surface Plasmon Polaritons Optical Tweezers Technology

光镊是捕获与操纵微纳颗粒的重要技术手段,其基本原理为光与物质之间动量传递的力学效应,具有非接触、操纵精度高等优点,广泛应用于物理、化学、生物及医学等科学前沿领域。近年来,表面等离激元因具有突破衍射极限和近场能量增强两大特性,为光镊技术的发展带来了新的突破口,成为国际上一个重要和前沿的研究方向。基于表面等离激元的新型光镊技术主要分为两类:结构型表面等离激元光镊技术和全光调控型表面等离激元光镊技术,它们在颗粒捕获精度、捕获范围、操纵动态性与操纵自由度等方面各有特色,吸引了国际上众多研究人员进行大量的理论研究和实验探索。表面等离激元光镊技术在纳米颗粒、金属颗粒捕获以及近场电磁场增强与调控方面展现了独特优势,在生物传感、表面增强拉曼散射等领域具有广阔的应用前景。

As an important technology for capturing and manipulating micro- and nano-particles, the optical tweezers rely on the basic principle of the mechanical effect of the momentum transfer between light and matter. It provides a non-contacting technique with a high precision, and has been widely used in physics, chemistry, biology, medicine and other scientific frontier fields. In recent years, surface plasmon polaritons have brought a new break- through for the development of the optical tweezers technology due to their excellent features of the near-field enhancement and the breakthrough of the diffraction limit, and become a very important and international frontier research direction. The new optical tweezers technologies based on the surface plasmon polaritons could be divided into the structure-based and the all-optical modulated surface plasmon polaritons, and each has its own advantages on particle trapping precision, trapping region size, dynamic and degree of freedom of manipulation. These new surface plasmon polaritons optical tweezers technologies attract researchers all over the world to carry out a large number of theoretical research and experimental exploration, show unique advantages on the trapping of nanoparticles and metallic particles and the enhancement and control of the near field electromagnetic field, and prove promising applications in the fields of biological sensing, surface enhanced Raman scattering, etc.