發(fā)布時(shí)間：2018-04-23 01:23

  本文選題：磁性光子晶體 + 空間反演對(duì)稱��； 參考：《江蘇大學(xué)》2017年碩士論文

【摘要】：磁光效應(yīng)與磁性光子晶體的結(jié)合是光子晶體研究領(lǐng)域一個(gè)新的熱點(diǎn)。磁性光子晶體在外磁場(chǎng)的作用下,磁導(dǎo)率為張量形式并且非對(duì)角元素為虛數(shù),系統(tǒng)的時(shí)間反演對(duì)稱性發(fā)生破缺,從而實(shí)現(xiàn)電磁波的單向傳輸。另外這些元素會(huì)隨著外加偏置磁場(chǎng)強(qiáng)度的變化而變化,進(jìn)而使得光子晶體的能帶結(jié)構(gòu)發(fā)生改變,實(shí)現(xiàn)可調(diào)諧的特性。本論文針對(duì)磁性光子晶體的特點(diǎn),利用基于磁性光子晶體的傳輸矩陣法,對(duì)一維磁性光子晶體的傳輸屬性進(jìn)行了研究,并設(shè)計(jì)出不同功能的光子器件。本文首先設(shè)計(jì)了四種周期性結(jié)構(gòu)的一維光子晶體,利用空氣層作為缺陷,分別計(jì)算其透射譜,通過比較驗(yàn)證了只有當(dāng)系統(tǒng)的時(shí)間反演對(duì)稱性和空間反演對(duì)稱性同時(shí)破缺時(shí),才可實(shí)現(xiàn)非互易傳輸,并且這種對(duì)稱性破缺程度越高,透射譜的分離度越大。緊接著在此基礎(chǔ)上繼續(xù)研究了缺陷層厚度和入射角度對(duì)非互易傳輸?shù)挠绊?發(fā)現(xiàn)通過調(diào)節(jié)缺陷層厚度和入射角度,非互易傳輸會(huì)形成高透射率和大消光比,該結(jié)構(gòu)可以被用作光學(xué)隔離器等非互易器件。另外,在此基礎(chǔ)上本文提出了一種新的機(jī)制實(shí)現(xiàn)單向傳輸,一維磁性光子晶體的透射率可以通過傳輸矩陣的方法計(jì)算,仿真可以采用有限元的方法。通過兩個(gè)非平行磁性光子晶體的串聯(lián),正向透射譜可以被裁剪成一個(gè)單峰,反向透射譜形成一個(gè)寬的禁帶,一個(gè)完整的單向傳輸就發(fā)生在寬的禁帶背景內(nèi),這是本文一個(gè)創(chuàng)新點(diǎn)。隨后本文提出了一種由負(fù)介電常數(shù)材料和磁性材料(YIG)周期性排列組成的磁微腔系統(tǒng),通過耦合腔諧振器的光子隧穿效應(yīng)設(shè)計(jì)了一個(gè)多通道濾波器,利用緊束縛模型和傳輸矩陣方法,分析其傳輸機(jī)制并研究其傳輸特性。通過微腔的耦合,單個(gè)諧振模式分裂成一些離散的單峰,從而形成多通道濾波。同時(shí)我們也分析了入射角度和負(fù)介電常數(shù)材料薄膜的厚度對(duì)濾波特性的影響,研究發(fā)現(xiàn)合適的結(jié)構(gòu)參數(shù)能使濾波器性能達(dá)到最優(yōu)。結(jié)合磁性材料的可調(diào)諧特性,我們進(jìn)一步改變外加偏置磁場(chǎng)的強(qiáng)度,發(fā)現(xiàn)隨著外加偏置磁場(chǎng)的強(qiáng)度變化,濾波通道會(huì)出現(xiàn)移動(dòng),從而實(shí)現(xiàn)通過改變磁場(chǎng)強(qiáng)度控制濾波器通道位置的功能。
[Abstract]:The combination of magneto-optic effect and magnetic photonic crystal is a new hotspot in the field of photonic crystal research. Under the action of external magnetic field of magnetic photonic crystal, the permeability is Zhang Liang form and non-diagonal element is imaginary number, the time inversion symmetry of the system is broken, thus the one-way transmission of electromagnetic wave is realized. In addition, these elements will change with the intensity of the applied bias magnetic field, and the band structure of the photonic crystal will be changed to achieve the tunable characteristics. According to the characteristics of magnetic photonic crystals, the transmission properties of one-dimensional magnetic photonic crystals are studied by using the transfer matrix method based on magnetic photonic crystals in this paper, and photonic devices with different functions are designed. In this paper, four kinds of periodic one-dimensional photonic crystals are designed and their transmission spectra are calculated by using the air layer as the defect. It is verified by comparison that only when the time inversion symmetry and the spatial inversion symmetry of the system break at the same time. The higher the degree of symmetry breaking, the greater the degree of separation of transmission spectrum. Then, the influence of defect layer thickness and incident angle on non-reciprocal transmission is studied. It is found that by adjusting the defect layer thickness and incident angle, the non-reciprocal transmission will form a high transmittance and a large extinction ratio. The structure can be used as non-reciprocal devices such as optical isolators. In addition, a new mechanism is proposed to realize unidirectional transmission. The transmissivity of one-dimensional magnetic photonic crystal can be calculated by the method of transmission matrix, and the finite element method can be used in simulation. Through the series of two nonparallel magnetic photonic crystals, the forward transmission spectrum can be cut into a single peak, and the reverse transmission spectrum forms a wide band gap, and a complete one-way transmission occurs in the wide forbidden band background. This is an innovation in this paper. Then a magnetic microcavity system consisting of negative dielectric constant materials and magnetic materials is proposed. A multichannel filter is designed by the photon tunneling effect of the coupled cavity resonator. The transmission mechanism is analyzed and its transmission characteristics are studied by using the tight-binding model and the transmission matrix method. By coupling the microcavity, the single resonant mode is split into some discrete single peaks, thus forming multi-channel filtering. At the same time, we analyze the influence of incident angle and thickness of negative dielectric constant material film on the filter characteristics. It is found that proper structure parameters can make the filter performance optimal. Combined with the tunable properties of magnetic materials, we further change the intensity of the applied bias magnetic field. It is found that the filter channel will move with the change of the intensity of the external bias magnetic field. Thus, the function of changing the magnetic field intensity to control the position of the filter channel is realized.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O734;TN713

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本文編號(hào)：1789827