【摘要】：研究基于電磁波的微粒捕獲和操控,對(duì)人類探尋電磁波與物質(zhì)相互作用規(guī)律,拓展電磁波在粒子物理、膠體物理、生命科學(xué)、材料科學(xué)、芯片實(shí)驗(yàn)室等領(lǐng)域中的應(yīng)用,具有非常重要的科學(xué)研究?jī)r(jià)值和意義。同時(shí),也會(huì)對(duì)物理、化學(xué)、生物等基礎(chǔ)學(xué)科之間的相互交叉發(fā)展帶來(lái)重要影響。為探索利用光頻段以下的電磁波捕獲和操控微粒,本文基于平面天線陣列和TR技術(shù),提出了多種高強(qiáng)度聚焦場(chǎng)產(chǎn)生方法,包括單點(diǎn)、多點(diǎn)以及中空環(huán)形等,研究了不同聚焦場(chǎng)對(duì)瑞利微粒的力學(xué)特性,數(shù)值證實(shí)了光頻段以下的高強(qiáng)度聚焦場(chǎng)對(duì)瑞利微粒具備一定的捕獲與操控能力。全文主要研究?jī)?nèi)容如下:首先,提出一種單點(diǎn)高強(qiáng)度時(shí)間反演聚焦場(chǎng)的產(chǎn)生方法和系統(tǒng)裝置,研究了平面時(shí)間反演鏡(Planar Time Reversal Mirror,P-TRM)的布置方式和聚焦位置對(duì)單點(diǎn)高強(qiáng)度聚焦場(chǎng)的影響,并基于該聚焦場(chǎng),提出了一種單微粒捕獲和操控的電磁鑷。研究發(fā)現(xiàn),采用雙層P-TRM更有利于產(chǎn)生高強(qiáng)度聚焦場(chǎng),特別是以極化方向相同的方式布置的雙層P-TRM能夠產(chǎn)生更高電磁強(qiáng)度的單點(diǎn)聚焦場(chǎng),并且產(chǎn)生的單點(diǎn)高強(qiáng)度聚焦場(chǎng)不會(huì)因聚焦位置的改變而變化。同時(shí),進(jìn)一步研究了單點(diǎn)高強(qiáng)度聚焦場(chǎng)的力學(xué)特性及其影響因素,發(fā)現(xiàn)對(duì)于瑞利微粒,微粒半徑越大,在單點(diǎn)高強(qiáng)度聚焦場(chǎng)中所受到的梯度力越大;對(duì)于高折射率瑞利微粒,微粒與環(huán)境媒質(zhì)的相對(duì)折射率越大,在單點(diǎn)高強(qiáng)度聚焦場(chǎng)中所受到的梯度力越大,但是,對(duì)于低折射率瑞利微粒,單點(diǎn)高強(qiáng)度聚焦場(chǎng)則無(wú)法捕獲;如果提高P-TRM的輸入功率,可增強(qiáng)單點(diǎn)高強(qiáng)度聚焦場(chǎng)對(duì)瑞利微粒的梯度力。通過(guò)數(shù)值仿真,理論證明了單點(diǎn)高強(qiáng)度聚焦場(chǎng)對(duì)高折射率瑞利微粒的捕獲和操控能力。其次,在單點(diǎn)高強(qiáng)度聚焦場(chǎng)研究的基礎(chǔ)上,基于反相電場(chǎng)相消原理,提出了一種新型的高強(qiáng)度聚焦場(chǎng)產(chǎn)生方法。該方法能夠產(chǎn)生小間距多點(diǎn)高強(qiáng)度聚焦場(chǎng),可同時(shí)操控和捕獲多個(gè)微粒,大幅度地提升了高強(qiáng)度聚焦場(chǎng)對(duì)多個(gè)微粒的操縱和捕獲能力。通過(guò)全波數(shù)值仿真,研究了有三個(gè)聚焦點(diǎn)的高強(qiáng)度聚焦場(chǎng)的產(chǎn)生,分析了聚焦場(chǎng)對(duì)三個(gè)a=1mm聚苯乙烯微粒的作用力大小,理論證明了多點(diǎn)高強(qiáng)度聚焦場(chǎng)具備同時(shí)捕獲與操控多個(gè)高折射率瑞利微粒的能力。最后,基于兩組正交的雙高強(qiáng)度聚焦場(chǎng)疊加,提出了一種產(chǎn)生中空環(huán)形高強(qiáng)度聚焦場(chǎng)的方法。并且,研究了預(yù)期聚焦位置點(diǎn)間距對(duì)中空環(huán)形高強(qiáng)度聚焦場(chǎng)的影響,分析了中空環(huán)形高強(qiáng)度聚焦場(chǎng)對(duì)低折射率瑞利微粒的力學(xué)作用效果。研究發(fā)現(xiàn),電磁波頻率為4.3GHz時(shí),產(chǎn)生中空環(huán)形高強(qiáng)度聚焦場(chǎng)的預(yù)期聚焦位置點(diǎn)間距D的取值范圍為:43.75mm(27)D(27)87.5mm,在此空間距離范圍內(nèi),中空環(huán)形高強(qiáng)度聚焦場(chǎng)產(chǎn)生的梯度力,可實(shí)現(xiàn)對(duì)低折射率瑞利微粒的捕獲與操控。
[Abstract]:This paper studies particle capture and manipulation based on electromagnetic wave, explores the law of interaction between electromagnetic wave and matter, and expands the application of electromagnetic wave in particle physics, colloid physics, life science, material science, chip laboratory, etc. Has very important scientific research value and significance. At the same time, it will also have an important impact on the development of physics, chemistry, biology and other basic disciplines. In order to explore the use of electromagnetic waves below the optical frequency band to capture and manipulate particles, based on planar antenna array and TR technology, this paper presents a variety of high-intensity focusing field generation methods, including single point, multi-point and hollow ring, etc. The mechanical properties of Rayleigh particles with different focusing fields are studied. The numerical results show that the high intensity focusing fields below the optical frequency band have a certain ability to capture and manipulate Rayleigh particles. The main contents of this paper are as follows: firstly, a method and a system device are proposed to generate the single point high intensity time inversion focusing field, and the plane time inversion mirror (Planar Time Reversal Mirror, is studied. Based on the P-TRM (single point high intensity focusing field), a single particle trapping and manipulating electromagnetic forceps is proposed. It is found that the double layer P-TRM is more advantageous to produce the high intensity focusing field, especially the double layer P-TRM with the same polarization direction can produce the single point focusing field with higher electromagnetic intensity. And the single-point high-intensity focusing field will not change with the change of focusing position. At the same time, the mechanical properties of single point high intensity focusing field and its influencing factors are further studied. It is found that for Rayleigh particles, the larger the particle radius is, the greater the gradient force is in the single point high intensity focusing field. For high refractive index Rayleigh particles, the larger the relative refractive index between particles and ambient media, the greater the gradient force in a single point high intensity focusing field, but for low refractive index Rayleigh particles, a single point high intensity focusing field cannot be captured. If the input power of P-TRM is increased, the gradient force of single point high intensity focusing field on Rayleigh particles can be enhanced. Through numerical simulation, the ability of capturing and manipulating Rayleigh particles with high refractive index by single point high intensity focusing field is proved theoretically. Secondly, based on the research of single-point high-intensity focusing field and the principle of inverse-phase electric field elimination, a new high-intensity focusing field generation method is proposed. This method can produce multi-point high-intensity focusing field with small spacing, and can control and capture multiple particles simultaneously, which greatly improves the ability of high-intensity focusing field to manipulate and capture multiple particles. The generation of high intensity focusing field with three focal points was studied by full-wave numerical simulation. The force of focusing field on three a=1mm polystyrene particles was analyzed. It is proved theoretically that the multi-point high-intensity focusing field has the ability to capture and manipulate multiple high-refractive index Rayleigh particles simultaneously. Finally, based on the superposition of two sets of orthogonal double high intensity focusing fields, a method for generating hollow annular high intensity focusing fields is proposed. Furthermore, the effect of the expected focus point spacing on the hollow ring high intensity focusing field is studied, and the mechanical effect of the hollow ring high intensity focusing field on the low refractive index Rayleigh particles is analyzed. It is found that when the electromagnetic wave frequency is 4.3GHz, the range of expected focus point spacing D for producing a hollow annular high-intensity focusing field is as follows: 43.75mm (27) D (27) 87.5 mm, within this space distance, The gradient-force generated by the high-intensity hollow annular focusing field can capture and manipulate the Rayleigh particles with low refractive index.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN820.15

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 畢思文;數(shù)字人體微觀研究——量子人體的時(shí)間反演[J];中國(guó)醫(yī)學(xué)影像技術(shù);2005年06期

2 郭權(quán)和;;用非線性折射產(chǎn)生時(shí)間反演的波前[J];激光與光電子學(xué)進(jìn)展;1978年05期

3 丁帥;王秉中;葛廣頂;王多;趙德雙;;基于時(shí)間透鏡原理實(shí)現(xiàn)微波信號(hào)時(shí)間反演[J];物理學(xué)報(bào);2012年06期

4 章志敏;;時(shí)間反演操作的表示方法及其等效表達(dá)[J];寧夏大學(xué)學(xué)報(bào)(自然科學(xué)版);2013年02期

5 張光e，

本文編號(hào)：2427968