發(fā)布時間：2018-06-05 11:53

  本文選題：光的軌道角動量 + 表面等離子激元��； 參考：《北京理工大學(xué)》2015年碩士論文

【摘要】：手性分子能展現(xiàn)出光學(xué)活性,它們對光的圓偏振度或螺旋性很敏感。通常人們利用這一特性,通過測量手性分子對左旋和右旋偏振光吸收的差,也就是圓二色性(CD),來衡量手性分子的手征特性。這些研究說明光學(xué)活性與光子的自旋角動量(SAM)具有內(nèi)在聯(lián)系。最近,人們認識到光子除了具有偏振特性之外,還可以攜帶軌道角動量(OAM)。那么OAM這個自由度的增加對CD是否會產(chǎn)生影響呢?基于這個問題,最近人們也做了很多研究,但得出了矛盾的結(jié)論:一些研究預(yù)測在電偶極子近似下這種相互作用是可以觀察到的,而另一些研究認為沒有這種效應(yīng)�？紤]到上述爭論問題,本論文對軌道角動量光束與手性分子/金屬納米顆粒復(fù)合結(jié)構(gòu)相互作用進行了實驗研究,探討金屬納米顆粒激發(fā)的表面等離激元能否誘導(dǎo)出軌道角動量和手性分子的相互作用。為此,我們設(shè)計了兩個實驗來觀察這種現(xiàn)象。一個是測量手性分子/金屬納米顆粒復(fù)合結(jié)構(gòu)對正負軌道角動量光束CD的差,另一個是直接探測樣品對正負軌道角動量光束吸收差。不幸的是,兩種方法均沒觀測到軌道角動量光束與手性分子/金屬納米顆粒復(fù)合結(jié)構(gòu)相互作用的信號。我們分析了實驗條件和理論計算的差別,澄清了產(chǎn)生這一矛盾的根源,為下一步實驗觀察這種相互作用指明了方向。
[Abstract]:Chiral molecules exhibit optical activity, which are sensitive to the circular polarization or helicity of light. It is usually used to measure the chiral molecules' chiral properties by measuring the difference in the absorption of left-handed and dextral polarized light by chiral molecules, that is, circular two color (CD). These studies show the spin angular motion of the optical activity and the photon. SAM has an inherent connection. Recently, people have realized that photons can also carry orbital angular momentum (OAM) in addition to polarization properties. Then whether the increase of the degree of freedom of OAM affects the CD? Based on this problem, a lot of research has been done recently, but a contradictory conclusion is drawn: some studies predict the electric dipole. In this paper, the interaction between orbital angular momentum beam and chiral molecule / metal nanoparticle composite structure is studied in this paper, and the induced surface plasmon excited by nanomi particles can be induced to be induced. The interaction between orbital angular momentum and chiral molecules. To this end, we have designed two experiments to observe this phenomenon. One is to measure the difference between the positive and negative orbital angular momentum beam CD of a chiral molecule / metal nanoparticle composite structure, and the other is to directly detect the difference in the absorption of the positive and negative orbital angular beam. Unfortunately, two methods are all No signal of interaction between orbital angular momentum beam and chiral molecular / metal nanoparticle composite structure was observed. We analyzed the difference between experimental and theoretical calculations, clarified the origin of the contradiction, and pointed out the direction for the next experiment to observe the interaction.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：O436.3;TB383.1

【共引文獻】

相關(guān)期刊論文 前1條

1 TIAN XiaoRui;TONG LianMing;XU HongXing;;New progress of plasmonics in complex metal nanostructures[J];Science China(Physics,Mechanics & Astronomy);2013年12期

相關(guān)博士學(xué)位論文 前1條

1 李西遠;表面等離激元與標準光纖的集成和應(yīng)用[D];浙江大學(xué);2014年

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本文編號：1981902