【摘要】：近年來,太赫茲波由于其獨(dú)特的性質(zhì)及廣泛的應(yīng)用前景而受到越來越多的關(guān)注,成為眾多學(xué)科領(lǐng)域研究熱點(diǎn)之一。亞波長(zhǎng)金屬陣列結(jié)構(gòu)在太赫茲波傳輸控制方面具有重要的科研及應(yīng)用價(jià)值,為了更好地探索基于太赫茲波的亞波長(zhǎng)結(jié)構(gòu)的功能器件,本文研究了不同結(jié)構(gòu)的雙層亞波長(zhǎng)金屬陣列結(jié)構(gòu),對(duì)其進(jìn)行傳輸特性仿真分析,開展了實(shí)驗(yàn)與測(cè)試,并設(shè)計(jì)了基于液晶材料電控可調(diào)器件。主要內(nèi)容如下:設(shè)計(jì)了F波段單層環(huán)形金屬亞波長(zhǎng)陣列結(jié)構(gòu)、雙層孔和雙層(圓和方)環(huán)形金屬亞波長(zhǎng)陣列結(jié)構(gòu)。通過數(shù)值仿真,優(yōu)化了如金屬孔直徑、金屬厚度及石英厚度等結(jié)構(gòu)參數(shù);分析了入射角和周期錯(cuò)位等因素對(duì)透射特性的影響,實(shí)現(xiàn)了透射帶寬33GHz,最大透射率91%;同時(shí),加工了陣列為50×50和40×40、邊長(zhǎng)為4cm的雙層圓和方環(huán)形金屬陣列結(jié)構(gòu)樣品,并搭建測(cè)試平臺(tái),開展了透射特性的測(cè)試,實(shí)際透射率低于仿真模擬的10%左右;對(duì)實(shí)驗(yàn)過程中出現(xiàn)的誤差等因素進(jìn)行了分析總結(jié)。在雙層金屬陣列結(jié)構(gòu)的基礎(chǔ)上,設(shè)計(jì)了一種基于液晶材料和雙層金屬圓孔陣列的太赫茲調(diào)制器。通過調(diào)節(jié)液晶介電常數(shù),在340GHz對(duì)垂直入射電磁波實(shí)現(xiàn)91.3%的調(diào)制深度。通過仿真分析不同入射角情況下該陣列結(jié)構(gòu)的傳輸特性,可以發(fā)現(xiàn)當(dāng)電場(chǎng)矢量平行于金屬表面時(shí),斜入射電磁場(chǎng)的幅值仍然能夠得到有效調(diào)制。模擬結(jié)果表明,上述結(jié)構(gòu)可以應(yīng)用于太赫茲自由空間傳輸系統(tǒng)中。
[Abstract]:In recent years, terahertz wave has attracted more and more attention due to its unique properties and wide application prospects, and has become one of the research hotspots in many disciplines. The subwavelength metal array structure has important scientific research and application value in the field of terahertz wave transmission control. In order to better explore the functional devices based on terahertz wave subwavelength structure, In this paper, the double-layer sub-wavelength metal array structures with different structures are studied, the transmission characteristics are simulated and analyzed, the experiments and tests are carried out, and the electronic controlled tunable devices based on liquid crystal materials are designed. The main contents are as follows: the F-band monolayer ring metal subwavelength array structure, double hole and double layer (circular and square) ring metal subwavelength array structure are designed. Through numerical simulation, the structural parameters such as the diameter of metal hole, the thickness of metal and the thickness of quartz are optimized, and the influence of incident angle and period dislocation on transmission characteristic is analyzed. The transmission bandwidth is 33GHz and the maximum transmittance is 91. At the same time, the double-layer circular and square ring metal array samples with 50 脳 50 and 40 脳 40 arrays with side length of 4cm are fabricated, and the transmission characteristics are tested. The actual transmittance is less than 10% of the simulated data. The error and other factors in the experiment are analyzed and summarized. A terahertz modulator based on liquid crystal material and double metal circular hole array is designed. By adjusting the dielectric constant of the liquid crystal, the modulation depth of 91.3% of the electromagnetic wave is achieved at 340GHz. By analyzing the transmission characteristics of the array at different incident angles, it is found that the amplitude of oblique incident electromagnetic field can still be modulated effectively when the electric field vector is parallel to the metal surface. The simulation results show that the above structure can be applied to terahertz free space transmission system.
【學(xué)位授予單位】：合肥工業(yè)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

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本文編號(hào)：2308888