Near Infrared Plasmonic Optical Trapping Based On A Nanorod Pair Array

Because light irradiation to micro-nano particles can change the initial state of the object,Optical trapping is widely used in many scientific,medical and other fields.Optical trapping,that is,no damage to trapping and manipulate micro-nano-level particles.Compared to the previous micro-focus-based Optical trapping technology,In recent years,Optical trapping have used metal nanostructures that can excite surface plasmon resonance,resulting in an increase in near-field Optical trapping,which it can trapping particles of the order of nanometer.Today,no damage,noncontact Optical trapping and Optical manipulation is an important hot spot and Near infrared in medicine has a unique background without interference.Therefore,this article presents Near Infrared Plasmonic Optical Trapping based on Hybrid Metal Nanorod and Optical trapping nanoparticles based on gold nanorod Pair Array.The main research contents,research results and experimental results are as follows: Firstly,we introduce the basic principle of optical tweezers and the theoretical calculation method of Optical trapping force in the first chapter.The maximum value of the optical trapping force is calculated to be about 6.6nN by the theoretical calculation of the Maxwell stress tensor and the simulation results.When the input power of the Near infrared nanoparticles trapping by the hybrid nanorod is 50 Mw.By comparing the Optical trapping force of the changes of the Longitudinal and lateral directions,we give the Optical trapping range based on these changes and overcoming the nanoparticle Brownian motion.Thirdly,we propose a gold nanostructure with the analysis and experiment of trapping nanoparticles.By the further theoretical calculation of Maxwell's stress tensor and simulation,When the input power is 50 mW,the maximum value of the optical force is calculated to be about 39 pN,In the experiment,we used a parallel beam from the substrate to irradiate the gold nanorod array upright on the substrate to study the movement of fluorescent particles and the trapping position.At the end of this paper,we propose a new method for the trapping of gold nanoparticles under infrared.then make a simple analysis.The nanorod array We designed is simple and easy to integrate on a smaller chip,so it can be used in the fields of life sciences,physical optics,medical labeling and other fields.