Double-beam fiber optical trap experiments based on supercontinuum laser
-
摘要: 以超连续谱激光器作为捕获光源，首次提出并搭建了超连续谱双光束光纤光阱实验系统，实现了聚苯乙烯微球的捕获和操控。通过改变光纤端面间隔和调整捕获光功率的方式精确控制微球的位置，采用CCD图像分析方法实现了微球位置的精确测量。对微球受限布朗运动下的位置变化进行傅里叶变换，计算得到功率谱，与理论功率谱函数拟合后求出了其光阱刚度。结果表明，捕获光束的功率为28 mW时，光阱刚度达到1.3×10-6 N/m，高于相同实验条件下单波长光纤光阱的刚度。与传统采用单色光作为捕获光源的光镊系统不同，超连续谱双光束光阱系统利用其宽谱优势，通过研究被捕获微粒的散射光谱信息可获取其尺寸、折射率等物理特征参数。Abstract: The experimental system of dual-beam fiber optical trap is proposed and built for the first time which can realize the trapping and manipulation of polystyrene microspheres by taking the supercontinuum laser as the trapping light source. The position of the microsphere is manipulated by changing the relative position of the two optical fiber end faces and output power of the fibers. The CCD image analysis method is used to measure the position of the microsphere. The power spectrum is calculated by Fourier transform of the position variation of the confined Brown motion. After fitting the theoretical power spectrum function, the optical trap stiffness is obtained. The results show that when the power of the captured beam is 28 mW, the optical trap stiffness can reach 1.3×10-6 N/m, which is higher than that of the single wavelength optical trap under the same experimental conditions. By taking advantage of the wide spectrum of the dual-beam optical trap system, the physical parameters such as the size and refractive index can be obtained by studying the scattering spectrum information of the captured particles which is different from the traditional use of monochromatic light as the captured light of the optical tweezers.
-
Key words:
- supercontinuum /
- fiber optical trap /
- stiffness of optical trap /
- manipulation
-
图 2 光纤输出端捕获光束光谱图
Figure 2. Spectrogram of the captured beam from the output end of the optical fiber
图 3 直径为10 μm小球被光阱捕获
Figure 3. A 10-μm polymer microsphere is trapped by the optical tweezer
图 4 移动光纤改变光阱中心微球所处位置
Figure 4. A position change of microspheres in the optical trap center by moving optical fiber
图 5 调整光束光功率改变光阱中心微球位置
Figure 5. A position change of microspheres in the optical trap center by adjusting the power of the light beam
-
[1] KEIR C N, BLOCK S M. Optical trapping[J]. Review of Scientific Instruments, 2004, 75(9):2787-2809. doi: 10.1063/1.1785844 [2] ALFANO R. The supercontinuum laser source[D]. New York:Sec. Edition, Springer, 2006. [3] GUILLON M. Field enhancement in a chain of optically bound dipoles[J]. Opt. Express, 2006, 14:3045-3055. doi: 10.1364/OE.14.003045 [4] FISCHER P, CARRUTHERS A E, WREGHT E M, et al.. Enhanced optical guiding of colloidal particles using a supercontinuum light source[J]. Opt. Express, 2006:145792-5802. https://www.researchgate.net/profile/K_Volke-Sepulveda/publication/26282887_Enhanced_optical_guiding_of_colloidal_particles_using_a_supercontinuum_light_source/links/53f4fed60cf2fceacc6ebeeb.pdf?disableCoverPage=true [5] 方晖, 杨爱萍.用于微米球形颗粒超分辨尺度测量的背向弹性散射光谱的获取[J].光学精密工程, 2014, 22(3):547-554. http://www.cnki.com.cn/Article/CJFDTOTAL-GXJM201403004.htmFANG H, YANG A P. Acquisition of elastic backscattering spectra for microsphere sizing beyond diffraction limit[J]. Opt. Precision Eng., 2014, 22(3):547-554.(in Chinese) http://www.cnki.com.cn/Article/CJFDTOTAL-GXJM201403004.htm [6] LI P, SHI K, LIU Z. Manipulation and spectroscopy of a single particle by use of white-light optical tweezers[J]. Opt. Lett., 2005, 30(2):156-158. doi: 10.1364/OL.30.000156 [7] NITKOWSKI A G, MICHAL L. On-chip supercontinuum optical trapping and resonance excitation of microspheres[J]. Optics Letters, 2010, 35:1626-1628. doi: 10.1364/OL.35.001626 [8] JONES S H, KING M D, WARD A D. Determining the unique refractive index properties of solid polystyrene aerosol using broadband Mie scattering from optically trapped beads[J]. Physical Chemistry Chemical Physics Pccp, 2013, 15(47):20735-20741. doi: 10.1039/c3cp53498g [9] GUILLON M, DHOLAKIA K, MCGLOIN D. Optical trapping and spectral analysis of aerosols with a supercontiuum laser source[J]. Optics Express, 2008, 16(11):7655-64. doi: 10.1364/OE.16.007655 [10] XIAO G, YANG K, LUO H, et al.. Orbital rotation of trapped particle in a transversely misaligned dual-fiber optical trap[J]. IEEE Photonics Journal, 2016, 8(1):1-1. http://ieeexplore.ieee.org/document/7378836/?arnumber=7378836 [11] CHEN X L, XIAO G Z, LUO H, et al.. Dynamics analysis of microsphere in a dualbeam fiber-optic trap with transverse offset[J]. Optics Express, 2016, 24(7). https://www.ncbi.nlm.nih.gov/pubmed/27137046 [12] PINON T M. Fiber-based dual-beam optical trapping platform for stretching lipid vesicles[J]. Pro Quest Dissertations & Theses Global, 2013. http://escholarship.org/uc/item/3mx0z8h0 [13] CONSTABLE A, KIM J, MERVIS J, et al.. Demonstration of a fiber-optical light-force trap[J]. Opt. Lett., 1993, 18(21):1867-1869. doi: 10.1364/OL.18.001867 [14] 龚錾. 纳米光镊系统的研制及微小力学量的测量[D]. 合肥: 中国科学技术大学, 2007.GONG Z. Development of nano optical Tweezers system and measurement of small mechanical quantities[D]. Hefei:University of Science and Technology of China, 2005.(in Chinese) [15] 周金华. 光镊的理论模型及纳米颗粒的操纵[D]. 合肥: 中国科学技术大学, 2010.ZHOU J H. Theoretical model of optical tweezers and manipulation of nanoparticles[D]. Hefei:University of Science and Technology of China, 2010.(in Chinese) [16] BECHHOEFER J, WILSON S. Faster, cheaper, safer optical tweezers for the undergraduate laboratory[J]. American J. Physics, 2002, 70(4):393-400. doi: 10.1119/1.1445403 [17] 董宇星, 刘伟宁.基于灰度特性的海天背景小目标检测[J].中国光学, 2010, 3(3):252-256. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGGA201003011.htmDONG Y X, LIU W N. Detection of sea-sky line in complicated background based on grey characteristics[J]. Chinese Optics, 2010, 3(3):252-256.(in Chinese) http://www.cnki.com.cn/Article/CJFDTOTAL-ZGGA201003011.htm [18] PINON T M. Fiber-based dual-beam optical trapping platform for stretching lipid vesicles[D]. California:University of California, Merced, 2013. [19] LI Z G, S Y, H H Z, et al.. Simulation and measurement of stiffness for dual beam laser trap using residual gravity method[J]. International J. Nanotechnology, 2015, 12:849-859. doi: 10.1504/IJNT.2015.071796 [20] DECOMBE J B, HUANT S, FICK J. Single and dual fiber nano-tip optical tweezers:trapping and analysis[J]. Optics Express, 2013, 21(25):30521-30531. doi: 10.1364/OE.21.030521 -
下载:
点击查看大图
图(6)
计量
- 文章访问数: 1562
- HTML全文浏览量: 431
- PDF下载量: 619
- 被引次数: 0
