空气缺陷镜像对称光子晶体滤波器研究
发布时间：2018-08-04 19:42
【摘要】：光子晶体可以对光波选择性传输,且具有体积小,光损耗低、易集成等优点,使其在微波、光通信、太阳能电池等多个领域得到了广泛的应用。其中光子晶体滤波器可以筛选出特定波长的光波,在光通信领域具有很好的应用前景,特别是在密集波分复用(DWDM)系统中可对通道波长进行检测。在一维光子晶体中引入由液晶、铌酸锂(LiNbO3)、锗酸铋(BGO)等材料组成的缺陷层,通过磁光、电光、热光、声光等效应改变介质层材料的折射率对缺陷模波长进行调谐,可以实现调谐滤波;但是这种引入缺陷介质的调谐滤波具有一定的局限性,如调谐可控性差,透射率低、半高宽不稳定、光损耗大;与这些光子晶体结构相比较,利用一维二元镜像对称光子晶体也可以实现滤波,且不含第三种介质材料构成的缺陷层,可以减小对光波的吸收;引入空气缺陷层可以采用超微机械技术对其厚度进行精细调谐,从而实现可调谐滤波;基于此,本文提出利用空气缺陷和一维镜像对称光子晶体实现光通信波段的单通道、双通道可调谐滤波的结构。主要研究内容总结如下:(1)基于光波在光子晶体的传播理论,推导了光波在多层介质的光学传输矩阵,并进一步推导了一维非对称和对称光子晶体的光学传输矩阵;最后导出了光波在三种光子晶体结构中传播时反射率和透射率的表达式。(2)设计了一种含空气缺陷镜像对称结构(H/L)N/D/(L/H)N,调整结构参数,对其能带特性进行数值模拟;光子禁带范围为1220nm-2100nm,且在1547.73nm处出现一个透射峰,可用于光通信C波段的单通道滤波。分别研究了空气层厚度、入射角度、温度、折射率等参数对其滤波性能的影响。结果表明:通过改变空气层厚度、温度可实现半高宽稳定、透射率高、线性调谐滤波;入射角度可实现光通信O、E、S、C波段的非线性调谐单通道滤波;介质层厚度的相互弥补,可以实现相同的滤波效果。(3)提出一种含空气缺陷复合镜像对称结构(H/L)N/D/(A/D/A)M/D/(L/H)N,选取结构参数,对其透射特性进行数值模拟;分别在1528.98nm、1564.74nm处出现一个透射峰,可用作光通信S、C波段的双通道滤波。研究发现:利用对厚度调谐可以实现线性调谐的双通道滤波;入射角度的增大使得两透射峰的位置蓝移,入射角度的改变会导致TE、TM两种模式波发生分离,角度调谐可用于偏振光的双通道滤波;同时通过改变折射率、介质层厚度、温度均可以实现调谐滤波。周期数M的改变使得通道数改变,通道数目为M+1,可实现近红外波段的多通道滤波。
[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.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN713;O734
本文编号：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.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN713;O734
【相似文献】
相关期刊论文 前1条
1 王润轩;物理学中的镜像对称性[J];宝鸡文理学院学报(自然科学版);1996年03期
相关硕士学位论文 前2条
1 温建华;空气缺陷镜像对称光子晶体滤波器研究[D];太原理工大学;2016年
2 周寅威;顶点代数发展及在镜像对称中的应用的综述[D];浙江大学;2010年
，本文编号：2164947
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/2164947.html
