太赫茲偏振分束器的結(jié)構(gòu)設(shè)計(jì)和性能研究
發(fā)布時(shí)間：2018-10-09 19:57
【摘要】：太赫茲波(Terahertz,簡(jiǎn)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(yīng)用廣泛。偏振分束器是光學(xué)系統(tǒng)中一種重要器件,可將光信號(hào)分離成兩個(gè)相互正交的偏振光,并沿著不同路徑傳輸,設(shè)計(jì)性能優(yōu)良的THz偏振分束器對(duì)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(shè)計(jì)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(shè)計(jì)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(shí)現(xiàn)折射率反轉(zhuǎn)匹配耦合,達(dá)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(shí),兩者分離長(zhǎng)度最短,分別為0.437cm和0.428cm,且此時(shí)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(zhǎng)度及損耗更具優(yōu)勢(shì),且操作方便,制作簡(jiǎn)單。(2)基于光子晶體的THz偏振分束器:設(shè)計(jì)了兩種光子晶體THz偏振分束器,分別利用禁帶特性和自準(zhǔn)直效應(yīng)與禁帶特性結(jié)合的方式實(shí)現(xiàn)偏振分離。采用平面展開(kāi)法和時(shí)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(dá)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(dá)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(zhǔn)直效應(yīng)與禁帶特性結(jié)合所設(shè)計(jì)的偏振分束器更易于實(shí)現(xiàn)(無(wú)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(yùn)行的帶寬遠(yuǎn)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(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O441.4;TN253
本文編號(hào)：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(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O441.4;TN253
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 張信祥;陳鶴鳴;;光子晶體偏振分束器的設(shè)計(jì)與性能分析[J];激光與光電子學(xué)進(jìn)展;2017年01期
2 莫國(guó)強(qiáng);李九生;;基于二維光子晶體的多頻段太赫茲波濾波器研究[J];光電子·激光;2016年09期
3 李緒友;許振龍;劉攀;凌衛(wèi)偉;張志永;;短長(zhǎng)度超高消光比雙芯光子晶體光纖偏振分束器[J];中國(guó)激光;2015年06期
4 周飛;費(fèi)宏明;楊毅彪;武建加;;Y型光子晶體偏振光分束器[J];紅外與毫米波學(xué)報(bào);2014年02期
5 韓博琳;婁淑琴;鹿文亮;蘇偉;鄒輝;王鑫;;新型超寬帶雙芯光子晶體光纖偏振分束器的研究[J];物理學(xué)報(bào);2013年24期
6 姚建銓;鐘凱;徐德剛;;太赫茲空間應(yīng)用研究與展望[J];空間電子技術(shù);2013年02期
7 陳曼雅;馮素春;任國(guó)斌;;雙芯光纖的應(yīng)用及研究進(jìn)展[J];激光與紅外;2013年06期
8 姜子偉;白晉軍;侯宇;王湘暉;常勝江;;太赫茲雙空芯光纖定向耦合器[J];物理學(xué)報(bào);2013年02期
9 白晉軍;王昌輝;侯宇;范飛;常勝江;;太赫茲雙芯光子帶隙光纖定向耦合器[J];物理學(xué)報(bào);2012年10期
10 劉沖;苑立波;;帶狀雙芯光纖及其雙折射特性分析[J];黑龍江大學(xué)工程學(xué)報(bào);2011年04期
相關(guān)博士學(xué)位論文 前3條
1 祝遠(yuǎn)鋒;微結(jié)構(gòu)低損耗太赫茲光纖及光纖傳感技術(shù)研究[D];江蘇大學(xué);2014年
2 侯宇;太赫茲光纖功能器件的設(shè)計(jì)與研究[D];南開(kāi)大學(xué);2013年
3 王昌輝;亞波長(zhǎng)微結(jié)構(gòu)太赫茲功能器件的研究[D];南開(kāi)大學(xué);2013年
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