本文關(guān)鍵詞：液晶光子晶體光纖THz濾波和傳感特性研究　出處：《天津理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 太赫茲 光子晶體光纖 液晶 溫度 電壓 濾波 傳感

【摘要】：THz波是介于微波和紅外之間的波,具有很優(yōu)秀的性質(zhì)。近年來(lái)對(duì)它的研究越來(lái)越熱,在科研和生活中的應(yīng)用研究也越來(lái)越多,如空間通信、大氣科學(xué)、安全檢測(cè)領(lǐng)域。但太赫茲波的直接運(yùn)用還比較少,主要是因?yàn)樗谧杂煽臻g傳播時(shí)損耗較大。太赫茲波導(dǎo)器件的開(kāi)發(fā)和研制成為THz能否被廣泛應(yīng)用的關(guān)鍵。光子晶體光纖不同于傳統(tǒng)光纖,其包層中有很多周期性排列的空氣孔,這種特殊的結(jié)構(gòu)使光子晶體光纖具有很多優(yōu)秀的性質(zhì)。光子晶體光纖與THz技術(shù)相結(jié)合,為THz波導(dǎo)器件的研究開(kāi)辟出一條嶄新的道路。在光子晶體光纖的空氣孔中填充液晶,可以改變光子晶體光纖的結(jié)構(gòu)參數(shù),使研究范圍進(jìn)一步拓寬。本文首先對(duì)液晶的光學(xué)性質(zhì)進(jìn)行了研究,選擇5CB液晶作為本文光子晶體光纖的填充材料,探究了它在溫度和電壓下的特性。介紹光子晶體光纖的一些結(jié)構(gòu)特征,綜合了目前主流的一些數(shù)值分析方法。利用有限元法,在研究具有二維周期性結(jié)構(gòu)的光子晶體光纖時(shí),給出了參數(shù)的選擇條件。本文研究了液晶摻雜的光子晶體光纖在THz波段的濾波和傳感特性。在調(diào)諧濾波方面,利用液晶折射率易控的特點(diǎn),提出一種全新的THz濾波器設(shè)計(jì)方案,把液晶材料填充到光子晶體光纖的空氣孔中,通過(guò)控制液晶的雙折射率來(lái)調(diào)諧光子晶體光纖的帶隙,改變太赫茲波的傳輸頻率,達(dá)到調(diào)諧濾波的目的。討論了反諧振模型,它可以預(yù)測(cè)帶隙型光子晶體光纖損耗的最大值點(diǎn)。研究了帶隙型光子晶體光纖的開(kāi)關(guān)和濾波特性,驗(yàn)證了反諧振模型的正確性,這樣可以利用反諧振模型來(lái)設(shè)計(jì)帶隙型光子晶體光纖的結(jié)構(gòu),從而實(shí)現(xiàn)特定波段的調(diào)諧濾波。在傳感方面,利用液晶的可調(diào)諧性,分析研究了帶隙型光子晶體光纖在溫度和電壓環(huán)境下的傳感特性,比較了在溫度和電場(chǎng)作用下,有效折射率、限制損耗、有效模場(chǎng)面積的不同特點(diǎn)。
[Abstract]:The THz wave is between microwave and infrared wave, has excellent properties. In recent years, the research on it is more and more hot, applied research in scientific research and life are more and more, such as space communication, atmospheric science, security detection. But the direct application of terahertz wave is still relatively small, mainly because of the larger it spread in free space loss. The development of terahertz waveguide devices and the development of the THz can be widely used as key. Photonic crystal fiber is different from the traditional fiber, the cladding air holes in a lot of periodic arrangement, this special structure makes the photonic crystal fiber has many excellent properties of photonic crystal fiber and THz. Technology combine to create a new way for the study of THz waveguide devices. Filling liquid crystal in the air hole photonic crystal fiber, can change the structure parameters of the photonic crystal fiber, which makes the research scope To further expand. Firstly, the optical properties of liquid crystal have been investigated, choose 5CB as filling material in liquid crystal photonic crystal fiber, explore it in the temperature and voltage characteristics. Some structural characteristics of the photonic crystal fiber, the current mainstream method. Some numerical analysis by finite element method with photonic crystals the fiber of two dimensional periodic structure in the study, select the conditions of parameters are given. The paper studies the filtering and sensing properties of photonic crystal fiber doped liquid crystal in THz band. The tunable filter, rate and easy to control by using liquid crystal refractive index, we propose a new THz filter design, the liquid crystal material is filled into the the air hole photonic crystal fiber, the birefringence of the liquid crystal is controlled to the rate of band gap tuning of photonic crystal fiber, change the transmission frequency of THz wave, achieve tunable filter Objective. To discuss the anti resonance model, which can predict the maximum band gap photonic crystal fiber loss. Studies with switch and filter characteristics of gap photonic crystal fiber, verify the correctness of the anti resonance model, it can use the anti resonant model to design the structure of photonic bandgap photonic crystal fibers. In order to achieve specific wavelength tunable filter. In the sensor, using a liquid crystal tunable, analysis of the band gap photonic crystal fiber sensing characteristics in temperature and voltage environment, compares the temperature and electric field, the effective refractive index, the confinement loss, different characteristics of the effective mode area.

【學(xué)位授予單位】：天津理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN253

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 黃小琴;陳鶴鳴;;太赫茲波在二維光子晶體波導(dǎo)中的傳輸特性研究[J];光電子技術(shù);2007年04期

2 何志紅;姚建銓;任俠;羅錫璋;時(shí)華峰;江紹基;王鵬;;緊湊型超輻射光泵重水氣體THz激光器的研制[J];光電子.激光;2008年01期

3 趙冬梅;周慶莉;李磊;施宇蕾;張存林;;太赫茲波段可調(diào)窄帶濾波器[J];紅外;2011年03期

4 張開(kāi)春;吳振華;劉盛綱;;周期極化非線性晶體中太赫茲波輻射研究[J];強(qiáng)激光與粒子束;2007年05期

5 周梅;陳效雙;王少偉;張建標(biāo);陸衛(wèi);;THz波段的F-P光子晶體濾波器[J];物理學(xué)報(bào);2006年07期

6 吳r，

本文編號(hào)：1396305