空氣缺陷鏡像對(duì)稱光子晶體濾波器研究
發(fā)布時(shí)間：2018-08-04 19:42
【摘要】：光子晶體可以對(duì)光波選擇性傳輸,且具有體積小,光損耗低、易集成等優(yōu)點(diǎn),使其在微波、光通信、太陽能電池等多個(gè)領(lǐng)域得到了廣泛的應(yīng)用。其中光子晶體濾波器可以篩選出特定波長的光波,在光通信領(lǐng)域具有很好的應(yīng)用前景,特別是在密集波分復(fù)用(DWDM)系統(tǒng)中可對(duì)通道波長進(jìn)行檢測。在一維光子晶體中引入由液晶、鈮酸鋰(LiNbO3)、鍺酸鉍(BGO)等材料組成的缺陷層,通過磁光、電光、熱光、聲光等效應(yīng)改變介質(zhì)層材料的折射率對(duì)缺陷模波長進(jìn)行調(diào)諧,可以實(shí)現(xiàn)調(diào)諧濾波;但是這種引入缺陷介質(zhì)的調(diào)諧濾波具有一定的局限性,如調(diào)諧可控性差,透射率低、半高寬不穩(wěn)定、光損耗大;與這些光子晶體結(jié)構(gòu)相比較,利用一維二元鏡像對(duì)稱光子晶體也可以實(shí)現(xiàn)濾波,且不含第三種介質(zhì)材料構(gòu)成的缺陷層,可以減小對(duì)光波的吸收;引入空氣缺陷層可以采用超微機(jī)械技術(shù)對(duì)其厚度進(jìn)行精細(xì)調(diào)諧,從而實(shí)現(xiàn)可調(diào)諧濾波;基于此,本文提出利用空氣缺陷和一維鏡像對(duì)稱光子晶體實(shí)現(xiàn)光通信波段的單通道、雙通道可調(diào)諧濾波的結(jié)構(gòu)。主要研究內(nèi)容總結(jié)如下:(1)基于光波在光子晶體的傳播理論,推導(dǎo)了光波在多層介質(zhì)的光學(xué)傳輸矩陣,并進(jìn)一步推導(dǎo)了一維非對(duì)稱和對(duì)稱光子晶體的光學(xué)傳輸矩陣;最后導(dǎo)出了光波在三種光子晶體結(jié)構(gòu)中傳播時(shí)反射率和透射率的表達(dá)式。(2)設(shè)計(jì)了一種含空氣缺陷鏡像對(duì)稱結(jié)構(gòu)(H/L)N/D/(L/H)N,調(diào)整結(jié)構(gòu)參數(shù),對(duì)其能帶特性進(jìn)行數(shù)值模擬;光子禁帶范圍為1220nm-2100nm,且在1547.73nm處出現(xiàn)一個(gè)透射峰,可用于光通信C波段的單通道濾波。分別研究了空氣層厚度、入射角度、溫度、折射率等參數(shù)對(duì)其濾波性能的影響。結(jié)果表明:通過改變空氣層厚度、溫度可實(shí)現(xiàn)半高寬穩(wěn)定、透射率高、線性調(diào)諧濾波;入射角度可實(shí)現(xiàn)光通信O、E、S、C波段的非線性調(diào)諧單通道濾波;介質(zhì)層厚度的相互彌補(bǔ),可以實(shí)現(xiàn)相同的濾波效果。(3)提出一種含空氣缺陷復(fù)合鏡像對(duì)稱結(jié)構(gòu)(H/L)N/D/(A/D/A)M/D/(L/H)N,選取結(jié)構(gòu)參數(shù),對(duì)其透射特性進(jìn)行數(shù)值模擬;分別在1528.98nm、1564.74nm處出現(xiàn)一個(gè)透射峰,可用作光通信S、C波段的雙通道濾波。研究發(fā)現(xiàn):利用對(duì)厚度調(diào)諧可以實(shí)現(xiàn)線性調(diào)諧的雙通道濾波;入射角度的增大使得兩透射峰的位置藍(lán)移,入射角度的改變會(huì)導(dǎo)致TE、TM兩種模式波發(fā)生分離,角度調(diào)諧可用于偏振光的雙通道濾波;同時(shí)通過改變折射率、介質(zhì)層厚度、溫度均可以實(shí)現(xiàn)調(diào)諧濾波。周期數(shù)M的改變使得通道數(shù)改變,通道數(shù)目為M+1,可實(shí)現(xiàn)近紅外波段的多通道濾波。
[Abstract]:Photonic crystals are widely used in many fields, such as microwave, optical communication, solar cells and so on, because of their small size, low optical loss and easy integration. Photonic crystal filter can filter out the specific wavelength of light wave, which has a good application prospect in optical communication field, especially in dense wavelength division multiplexing (DWDM) system can detect channel wavelength. A defect layer composed of liquid crystal, lithium niobate (LiNbO3) and bismuth germanate (BGO) was introduced into the one-dimensional photonic crystal. The defect mode wavelength was tuned by magneto-optic, electro-optic, thermo-optical and acousto-optic effects. The tunable filter can be realized, but this kind of tunable filter with defective medium has some limitations, such as poor tuning controllability, low transmittance, unstable half-maximum width and large optical loss, compared with these photonic crystal structures, the tunable filter has some limitations, such as poor tuning controllability, low transmittance, instability of half-maximum width and large optical loss. The filter can also be realized by using one-dimensional binary mirror symmetric photonic crystal, and the absorption of light wave can be reduced without the defect layer formed by the third dielectric material. The fine tuning of the thickness of air defect layer can be carried out by using ultrafine mechanical technology to realize tunable filtering. Based on this, a single channel of optical communication band can be realized by using air defect and one-dimensional mirror symmetric photonic crystal. Dual channel tunable filter structure. The main research contents are summarized as follows: (1) based on the theory of optical wave propagation in photonic crystal, the optical transmission matrix of optical wave in multilayer medium is derived, and the optical transmission matrix of one-dimensional asymmetric and symmetric photonic crystal is derived. Finally, the expressions of reflectivity and transmittance of light waves propagating in three photonic crystal structures are derived. (2) A mirror symmetrical structure (H / L) N/D/ (L / H) N with air defects is designed to adjust the structure parameters and simulate the energy band characteristics. The photonic band gap ranges from 1220nm-2100nm and a transmission peak appears at 1547.73nm, which can be used for single channel filtering in C-band optical communication. The effects of air layer thickness, incident angle, temperature and refractive index on the filter performance are studied. The results show that by changing the thickness of the air layer, the temperature can achieve the stability of the half-maximum width, the high transmittance and the linear tuning filter; the incident angle can realize the nonlinear tunable single-channel filtering of the optical communication in the OFO ESI C band; the thickness of the dielectric layer can make up for each other. The same filtering effect can be achieved. (3) A composite mirror symmetrical structure (H / L) N/D/ (A/D/A) M/D/ (L / H) N with air defects is proposed, and its transmission characteristics are numerically simulated by selecting the structural parameters, with a transmission peak at 1564.74 nm at 1528.98 nm. It can be used as a double channel filter for optical communication in C band. It is found that the two-channel filter can be linearly tuned by the thickness tuning, and the increase of the incidence angle causes the blue shift of the position of the two transmission peaks, and the change of the incidence angle will result in the separation of the two modes of Tet TM waves. Angle tuning can be used for two-channel filtering of polarized light, and tunable filtering can be achieved by changing refractive index, thickness of dielectric layer and temperature. The number of channels is changed with the change of the number of periods M, and the number of channels is M1, which can realize the multi-channel filtering in near infrared band.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN713;O734
本文編號(hào)：2164947
[Abstract]:Photonic crystals are widely used in many fields, such as microwave, optical communication, solar cells and so on, because of their small size, low optical loss and easy integration. Photonic crystal filter can filter out the specific wavelength of light wave, which has a good application prospect in optical communication field, especially in dense wavelength division multiplexing (DWDM) system can detect channel wavelength. A defect layer composed of liquid crystal, lithium niobate (LiNbO3) and bismuth germanate (BGO) was introduced into the one-dimensional photonic crystal. The defect mode wavelength was tuned by magneto-optic, electro-optic, thermo-optical and acousto-optic effects. The tunable filter can be realized, but this kind of tunable filter with defective medium has some limitations, such as poor tuning controllability, low transmittance, unstable half-maximum width and large optical loss, compared with these photonic crystal structures, the tunable filter has some limitations, such as poor tuning controllability, low transmittance, instability of half-maximum width and large optical loss. The filter can also be realized by using one-dimensional binary mirror symmetric photonic crystal, and the absorption of light wave can be reduced without the defect layer formed by the third dielectric material. The fine tuning of the thickness of air defect layer can be carried out by using ultrafine mechanical technology to realize tunable filtering. Based on this, a single channel of optical communication band can be realized by using air defect and one-dimensional mirror symmetric photonic crystal. Dual channel tunable filter structure. The main research contents are summarized as follows: (1) based on the theory of optical wave propagation in photonic crystal, the optical transmission matrix of optical wave in multilayer medium is derived, and the optical transmission matrix of one-dimensional asymmetric and symmetric photonic crystal is derived. Finally, the expressions of reflectivity and transmittance of light waves propagating in three photonic crystal structures are derived. (2) A mirror symmetrical structure (H / L) N/D/ (L / H) N with air defects is designed to adjust the structure parameters and simulate the energy band characteristics. The photonic band gap ranges from 1220nm-2100nm and a transmission peak appears at 1547.73nm, which can be used for single channel filtering in C-band optical communication. The effects of air layer thickness, incident angle, temperature and refractive index on the filter performance are studied. The results show that by changing the thickness of the air layer, the temperature can achieve the stability of the half-maximum width, the high transmittance and the linear tuning filter; the incident angle can realize the nonlinear tunable single-channel filtering of the optical communication in the OFO ESI C band; the thickness of the dielectric layer can make up for each other. The same filtering effect can be achieved. (3) A composite mirror symmetrical structure (H / L) N/D/ (A/D/A) M/D/ (L / H) N with air defects is proposed, and its transmission characteristics are numerically simulated by selecting the structural parameters, with a transmission peak at 1564.74 nm at 1528.98 nm. It can be used as a double channel filter for optical communication in C band. It is found that the two-channel filter can be linearly tuned by the thickness tuning, and the increase of the incidence angle causes the blue shift of the position of the two transmission peaks, and the change of the incidence angle will result in the separation of the two modes of Tet TM waves. Angle tuning can be used for two-channel filtering of polarized light, and tunable filtering can be achieved by changing refractive index, thickness of dielectric layer and temperature. The number of channels is changed with the change of the number of periods M, and the number of channels is M1, which can realize the multi-channel filtering in near infrared band.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN713;O734
【相似文獻(xiàn)】
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1 王潤軒;物理學(xué)中的鏡像對(duì)稱性[J];寶雞文理學(xué)院學(xué)報(bào)(自然科學(xué)版);1996年03期
相關(guān)碩士學(xué)位論文 前2條
1 溫建華;空氣缺陷鏡像對(duì)稱光子晶體濾波器研究[D];太原理工大學(xué);2016年
2 周寅威;頂點(diǎn)代數(shù)發(fā)展及在鏡像對(duì)稱中的應(yīng)用的綜述[D];浙江大學(xué);2010年
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