太赫茲偏振分束器的結(jié)構(gòu)設計和性能研究
發(fā)布時間：2018-10-09 19:57
【摘要】：太赫茲波(Terahertz,簡稱THz),是指頻率在0.1~10THz范圍內(nèi)的電磁波,在通信、成像和空間探索等方面應用廣泛。偏振分束器是光學系統(tǒng)中一種重要器件,可將光信號分離成兩個相互正交的偏振光,并沿著不同路徑傳輸,設計性能優(yōu)良的THz偏振分束器對于THz器件的研究具有重要意義。本文基于雙芯光纖和光子晶體設計了兩類THz偏振分束器,具體研究如下:(1)基于雙芯光纖的THz偏振分束器:設計了兩種基于領(lǐng)結(jié)型多孔光纖的雙芯THz偏振分束器,分別采用填充法和調(diào)整結(jié)構(gòu)法實現(xiàn)折射率反轉(zhuǎn)匹配耦合,達到偏振分離的目的。采用有限元法建模仿真,結(jié)果表明:兩者的頻率工作范圍均為0.5~2.5THz;在f=0.5THz時,兩者分離長度最短,分別為0.437cm和0.428cm,且此時兩者的x-和y-偏振模損耗也最低,分別為0.037dB、0.039dB和0.033dB、0.033d B;x-和y-偏振模的消光比最高分別為25.16dB、24.92dB和22.94dB、20.51dB。兩者相比,填充法的THz偏振分束器的消光比整體較高;而調(diào)整結(jié)構(gòu)法的THz偏振分束器在高頻處的分離長度及損耗更具優(yōu)勢,且操作方便,制作簡單。(2)基于光子晶體的THz偏振分束器:設計了兩種光子晶體THz偏振分束器,分別利用禁帶特性和自準直效應與禁帶特性結(jié)合的方式實現(xiàn)偏振分離。采用平面展開法和時域有限差分法建模仿真,結(jié)果表明:前者頻率工作范圍為2.8125~2.865THz,TE模和TM模的消光比最高可達25.2dB和25.4dB,其透射率均高于95%;后者頻率工作范圍為2.9~3.01THz,TE模和TM模的消光比最高可達19.9dB和26.24dB,TE模的反射率和TM模的透射率均高于90%。兩者相比,基于自準直效應與禁帶特性結(jié)合所設計的偏振分束器更易于實現(xiàn)(無需引入缺陷),帶寬更寬。將兩類THz偏振分束器相比較,基于光子晶體的THz偏振分束器的尺寸更小,但運行的帶寬遠不如基于雙芯光纖的THz偏振分束器。
[Abstract]:Terahertz wave (THz),) is the electromagnetic wave with frequency in the range of 0.1~10THz, which is widely used in communication, imaging and space exploration. Polarization beam splitter is an important device in optical system. The optical signal can be separated into two mutually orthogonal polarized light and transmitted along different paths. The design of THz polarization splitter with excellent performance is of great significance to the research of THz devices. In this paper, two kinds of THz polarization beam splitters are designed based on dual-core fiber and photonic crystal. The main contents are as follows: (1) THz polarization splitter based on dual-core fiber: two kinds of dual-core THz polarizer based on bow type porous fiber are designed. The refractive index inversion matching coupling is realized by filling method and adjusting structure method respectively, and polarization separation is achieved. The finite element method is used to model and simulate. The results show that the frequency range of both is 0.5 ~ 2.5THz, the separation length of the two is the shortest, 0.437cm and 0.428 cm, respectively, and the loss of x- and y- polarization mode is the lowest in the case of f=0.5THz. The highest extinction ratios of 0.037 dB and 0.033 dB and y- polarization mode are 25.16 dB and 22.94 dB respectively. Compared with the two methods, the THz polarization splitter with filling method has a higher extinction ratio, while the THz polarization splitter with adjusting structure has more advantages in separation length and loss at high frequency, and is easy to operate. Simple fabrication. (2) THz polarization beam splitter based on photonic crystal: two kinds of photonic crystal THz polarization splitter are designed. Polarization separation is realized by combining band gap and self-collimation effect with forbidden band characteristic respectively. The plane expansion method and the finite-difference time-domain method are used to model and simulate. The results show that the extinction ratio of the former frequency range is 2.8125 ~ 2.865 THZN te mode and TM mode, the highest extinction ratio of 25.2dB and 25.4dB is higher than 95 dB, while the latter frequency range is 2.9 ~ 3.01THznte mode and TM mode, the extinction ratio of 19.9dB and 26.24dBTE mode is up to the highest and the reflectivity of TM mode is up to 26.24dBTE mode. The transmittance of the modes is higher than 90. The polarization splitter based on the combination of self-collimation effect and band gap is easier to realize (without introducing defects) and the bandwidth is wider. Compared with two kinds of THz polarization splitter, the size of THz polarization splitter based on photonic crystal is smaller, but the bandwidth is much lower than that of THz polarization splitter based on dual-core fiber.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O441.4;TN253
本文編號：2260592
[Abstract]:Terahertz wave (THz),) is the electromagnetic wave with frequency in the range of 0.1~10THz, which is widely used in communication, imaging and space exploration. Polarization beam splitter is an important device in optical system. The optical signal can be separated into two mutually orthogonal polarized light and transmitted along different paths. The design of THz polarization splitter with excellent performance is of great significance to the research of THz devices. In this paper, two kinds of THz polarization beam splitters are designed based on dual-core fiber and photonic crystal. The main contents are as follows: (1) THz polarization splitter based on dual-core fiber: two kinds of dual-core THz polarizer based on bow type porous fiber are designed. The refractive index inversion matching coupling is realized by filling method and adjusting structure method respectively, and polarization separation is achieved. The finite element method is used to model and simulate. The results show that the frequency range of both is 0.5 ~ 2.5THz, the separation length of the two is the shortest, 0.437cm and 0.428 cm, respectively, and the loss of x- and y- polarization mode is the lowest in the case of f=0.5THz. The highest extinction ratios of 0.037 dB and 0.033 dB and y- polarization mode are 25.16 dB and 22.94 dB respectively. Compared with the two methods, the THz polarization splitter with filling method has a higher extinction ratio, while the THz polarization splitter with adjusting structure has more advantages in separation length and loss at high frequency, and is easy to operate. Simple fabrication. (2) THz polarization beam splitter based on photonic crystal: two kinds of photonic crystal THz polarization splitter are designed. Polarization separation is realized by combining band gap and self-collimation effect with forbidden band characteristic respectively. The plane expansion method and the finite-difference time-domain method are used to model and simulate. The results show that the extinction ratio of the former frequency range is 2.8125 ~ 2.865 THZN te mode and TM mode, the highest extinction ratio of 25.2dB and 25.4dB is higher than 95 dB, while the latter frequency range is 2.9 ~ 3.01THznte mode and TM mode, the extinction ratio of 19.9dB and 26.24dBTE mode is up to the highest and the reflectivity of TM mode is up to 26.24dBTE mode. The transmittance of the modes is higher than 90. The polarization splitter based on the combination of self-collimation effect and band gap is easier to realize (without introducing defects) and the bandwidth is wider. Compared with two kinds of THz polarization splitter, the size of THz polarization splitter based on photonic crystal is smaller, but the bandwidth is much lower than that of THz polarization splitter based on dual-core fiber.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O441.4;TN253
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