本文關(guān)鍵詞：自加速光場和陣列光場的研究及在光捕獲中的應(yīng)用　出處：《中國科學(xué)技術(shù)大學(xué)》2016年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 光鑷 自加速光場 陣列光場 自聚焦光場 光瓶 微流變

【摘要】：光鑷是基于光的力學(xué)效應(yīng)捕獲和操控微觀粒子的工具。光鑷最早由Ashkin發(fā)明,它通過會聚高斯光形成的三維光勢阱來實現(xiàn)微粒捕獲。光鑷的作用力和作用尺度分別為皮牛和微納量級,這使得它在軟物質(zhì),分散體系和單分子等領(lǐng)域研究中具有廣泛應(yīng)用。然而隨著新興領(lǐng)域的發(fā)展和對光鑷操控新要求的提出,傳統(tǒng)高斯光鑷也面臨著諸多應(yīng)用困境,如對系宗微粒的同時操控或者選擇性捕獲,異質(zhì)體粘彈性測量,低折射率或吸熱粒子三維捕獲以及生物組織內(nèi)的深度捕獲等。這些問題的解決有賴于發(fā)展新型光鑷捕獲技術(shù),同時對推動軟物質(zhì)和生物物理等領(lǐng)域的研究進展也具有重要意義。自加速光場和陣列光場是目前衍射光學(xué)領(lǐng)域的研究熱門,通過在光鑷系統(tǒng)中引入這些新型光場有望解決傳統(tǒng)高斯光的捕獲困境。自加速光場是新近研究的一個熱點,它是一類光場的總稱,典型代表有艾利光和圓對稱艾利光等,它們一般都是波動方程的解,都能通過衍射光學(xué)元件實驗生成。相較會聚高斯光,自加速光場具有特殊的光場結(jié)構(gòu)和傳輸軌跡,因此應(yīng)用在光捕獲領(lǐng)域有望捕獲特殊粒子或開發(fā)出新的光捕獲形式。陣列光場的典型代表是陣列高斯光,一般通過空間光調(diào)制器對高斯光相位調(diào)制生成,目前人們已經(jīng)建立了完善的陣列高斯光生成算法。陣列高斯光阱的特點是能對不同體系的多微粒進行同時捕獲和操控,它有望解決軟物質(zhì)領(lǐng)域中的自組裝和異質(zhì)體粘彈性測量等問題。本人博士階段工作主要集中在自加速光場和陣列光場的特性研究以及發(fā)展它們在光鑷捕獲和軟物質(zhì)粘彈性測量等領(lǐng)域的應(yīng)用。本文主要有以下幾部分內(nèi)容:1.綜述了自加速光場和陣列光場的理論基礎(chǔ)和發(fā)展現(xiàn)狀,以及液晶空間光調(diào)制器的復(fù)振幅調(diào)制技術(shù)。2.基于角譜理論,提出了兩種振幅模板并研究了它們對對稱艾利光的振幅調(diào)制。第一種為指數(shù)振幅模板,它能在角譜面上抑制對稱艾利光的相關(guān)頻譜分量,據(jù)此我們得到了一種新的補償加速光場。這種加速光場能在不同損耗介質(zhì)保持主瓣光強傳輸不變,還兼有衰減震蕩傳輸特性,具有這些性質(zhì)的自加速光場是我們首次報道的,它有望應(yīng)用于損耗介質(zhì)(如生物組織)的深度光操控中。第二種為對稱振幅模板,我們理論和實驗研究了這種振幅模板對對稱艾利光的振幅調(diào)制,發(fā)現(xiàn)它能增強光場的高頻頻譜分量,進而提高對稱艾利光的自聚焦特性和軸向梯度力,這種新型振幅調(diào)制的對稱艾利光能提高光鑷對系宗微粒的捕獲穩(wěn)定性。3.通過對稱化三階多邊形光場角譜,提出了一種新的對稱多邊形加速光場。理論和實驗研究了這種加速光場的傳輸特性,發(fā)現(xiàn)該光場除具有自聚焦特性外,還有針形中心光瓣和對稱多通道旁瓣的光場結(jié)構(gòu),實驗也發(fā)現(xiàn)它具有強自修復(fù)特性。進一步的,我們將該光場耦合進光鑷系統(tǒng),實現(xiàn)了這種對稱加速光場能對不同空間位置微粒的選擇性輸運和捕獲,這種多通道結(jié)構(gòu)的自加速光場有望在光流體等領(lǐng)域得到重要應(yīng)用。4.利用一種新的可調(diào)控光瓶實現(xiàn)了對水溶液中吸熱粒子的可調(diào)控捕獲。光瓶由修正貝塞爾函數(shù)疊加生成,通過改變幾何參量能調(diào)控光瓶的暗區(qū)大小和暗度。實驗基于液晶空間光調(diào)制器的復(fù)振幅調(diào)制技術(shù)來實驗生成光瓶并用于光捕獲。我們分析了不同暗區(qū)暗度的光瓶對吸熱粒子的光泳力影響,并通過調(diào)節(jié)幾何參量大小,實現(xiàn)了不同暗度光瓶對吸熱粒子的可調(diào)控捕獲。光瓶光場能解決光鑷對特殊粒子如吸熱粒子的捕獲問題。5.搭建了消像差的陣列高斯光鑷裝置,實現(xiàn)了陣列高斯光阱對軟物質(zhì)粘彈性的多微區(qū)并行測量。實驗首先利用相位補償技術(shù)對陣列高斯光鑷光路進行了像差校正,實驗使得陣列光阱剛度提高了 40%�；谇捌谙癫钚Ｕぷ�,我們改進了陣列高斯光鑷光路。同時通過GS算法生成了高質(zhì)量陣列多光阱并用于測量軟物質(zhì)的多微區(qū)粘彈性。實驗結(jié)果說明了陣列多光阱的并行測量能提高實驗精度,同時也驗證了它的多微區(qū)測量能力,我們工作為后續(xù)利用陣列多光阱測量異質(zhì)體粘彈性打下了良好基礎(chǔ)�；谝陨瞎ぷ�,我們建立了新型光場光鑷捕獲和應(yīng)用的一些計算和實驗研究方法。并從傳統(tǒng)高斯光鑷的應(yīng)用困境出發(fā),分別對自加速光場和陣列光場的傳輸特性進行了較為深入研究和進一步優(yōu)化,提出了一些新的自加速光場并演示了它們在光捕獲中的應(yīng)用。我們相信這些工作對光鑷在軟物質(zhì),生物醫(yī)學(xué)等領(lǐng)域的研究具有一定借鑒意義。
[Abstract]:Optical tweezers is the mechanical effect of light trapping and manipulation of micro particles in optical tweezers based tools. The earliest invented by Ashkin, it is by the convergence of three dimensional optical trap Gauss light form to realize particle capture. Forces and scale of optical tweezers were cattle skin and micro nano, which makes it in soft matter, has application study on dispersion system and single molecular fields. However, with the development of the emerging field of control and new requirements for optical tweezers is proposed, the traditional Gauss optical tweezers is also faced with many difficulties in the application of the system, such as in particle manipulation or selective capture at the same time, measuring different plastid viscoelasticity, low refractive index or endothermic three-dimensional particle capture and capture the depth of biological tissue. The solution of these problems depends on the development of new optical tweezers technology, but also has important significance to promote the progress of soft matter and biological physics and other fields. Since the The speed of light field and array light field is currently hot research field of optical diffraction, through the introduction of these new light in the optical tweezers system is expected to solve the plight of traditional Gauss light capture. Self accelerating light field is a research hotspot recently, it is a general term for a class of light field, a typical representative of Ai Liguang and circular symmetry avery light, they are generally the solution of wave equation can be experimentally generated diffractive optical elements. Compared with the convergence of Gauss light, self accelerating light field with special optical field structure and transmission path, so the application in light harvesting areas is expected to capture special particles or develop new light capture typical array form. The light field is an array of Gauss light, generally through the spatial light modulator of Gauss optical phase modulation generation, at present people have established a perfect array generation algorithm for optical Gauss. Gauss is the characteristics of the array optical trap to different systems The particles are also captured and manipulated, it is expected to solve the self-assembly and heterogeneous viscoelastic measurement problems in the field of soft matter. My doctoral work focused on the self accelerating phase of the light field and array light field characteristics of research and development and their applications in optical tweezers and soft material viscoelasticity measurement and other fields. This paper consists of the following parts: 1. the paper summarizes the basic theory and development status of accelerated light field and array light field, and liquid crystal spatial light modulator.2. complex amplitude modulation technique based on angular spectrum theory, put forward two kinds of amplitude mask and to study their avery of symmetrical light amplitude modulation. The first one is the index the amplitude of the template, the relevant spectral components it can suppress the symmetric avery light in the angular spectrum of plane, so we can get a new compensation accelerated light field. This acceleration field can keep the main loss in different medium Light transmission valve also has the shock attenuation constant, the transmission characteristics of these properties, self accelerating field is reported for the first time, it is expected to be applied to the medium loss (such as biological tissue). The depth of the optical manipulation of second kinds of symmetric amplitude template, our theoretical and experimental research of the amplitude modulation of the amplitude of the symmetric template avery light, it can enhance the high-frequency spectral components of the light field, and improve the self focusing characteristics and axial gradient force symmetry avery light, avery light symmetric amplitude modulation of this new type of optical tweezers system to improve the stability of.3. in particle capture by symmetric three order polygon light field angular spectrum, proposes a new the symmetrical polygon acceleration field. The transmission characteristics of optical field accelerate the theoretical and experimental research, found that the light field has self focusing properties, and needle valve and multi channel optical center symmetric sidelobe light Field structure, experiments have found that it has strong self repairing characteristics. Further, we will be the light coupled into the optical tweezers system, realized the symmetric light field can accelerate the selectivity of different spatial position of particle transport and capture, self accelerating light field is expected to be a new adjustable light bottle for endothermic particles in aqueous solution can be used to capture the important application of.4. control in the field of optical fluid of the multi-channel structure. The light bottle produced by the modified Bessel function superposition, by changing the geometric parameters can control the light bottle dark area size and dark. The complex amplitude modulation technology based on liquid crystal spatial light modulator to generate optical experiment the bottle and used to capture light. We analyzed the photophoretic force light dark dark bottles of different degree of heat absorbing particle effects, and by adjusting the geometric parameters of size, to achieve a different light dark bottle of particles can be controlled to capture heat Light. Light field optical tweezers can solve the bottle of special particles such as heat absorbing particle acquisition problem of.5. to build the Gauss array optical tweezers device of optical aberration, the array of optical trap Gauss soft material viscoelastic multi micro parallel measurement. Experiment first array optical tweezers were Gauss optical aberration correction by using phase compensation technology experiment makes the array of optical trap stiffness improves the pre 40%. aberration correction based on the work, we improved the optical tweezers array of Gauss road. At the same time through the GS algorithm to generate high quality array optical tweezers and used to measure the soft material multi micro area viscoelastic. Experimental results prove that the parallel measurement can improve the precision of array multiple optical tweezers, and validate its multi micro measurement capability, our work lays a good foundation for the subsequent use of array of optical trap measuring heterogeneous viscoelastic. Based on the above work, we have established a new light field Optical tweezers and application of some computational and experimental research method. And from the point of view of the difficulties in the application of traditional Gauss optical tweezers, respectively on the self accelerating light field and array light field transmission characteristics are studied deeply and further optimization, and puts forward some new self accelerating light field and demonstrates their application in optical capture. We believe that these work of optical tweezers in soft matter, has certain reference significance in biomedical research and other fields.

【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：O439

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