本文關鍵詞：多諧振型太赫茲超材料生物傳感器研究　出處：《哈爾濱理工大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 超材料 太赫茲 多諧振 生物傳感器 靈敏度

【摘要】：超材料是由周期性排列的亞波長單元陣列所構成的新型人工復合型電磁材料,具有自然界中常規(guī)材料所不具備的特殊電磁特性,如負折射率、負介電常數(shù)、反多普勒效應等。其中,諧振型超材料具有微納尺寸縫隙,可顯著增強局域電磁場強度,對周圍環(huán)境的介電特性變化特別敏感。因此,諧振型超材料可廣泛地應用于傳感探測領域。同時,太赫茲波的光子能量相對較低,能夠激發(fā)生物分子的集體震蕩模式,可增強對生物分子的探測的靈敏度;另外,大多數(shù)生物分子在太赫茲波段具有特定的指紋譜,在識別和探測生物分子方面具有獨特的優(yōu)勢�；谏鲜鲈�,本文設計了兩種不同結構的太赫茲超材料傳感器,分別為基于互補型雙諧振和基于吸收器的多諧振的太赫茲超材料生物傳感器,并采用基于有限元方法的數(shù)值仿真軟件HFSS分別對兩種傳感器的靈敏度進行模擬計算和數(shù)值優(yōu)化分析,其主要研究工作如下:1.設計一種基于互補型雙諧振超太赫茲材料生物傳感器,其結構單元由圓環(huán)間隙構成。采用數(shù)值仿真軟件對傳感器的結構參數(shù)進行優(yōu)化,并對其表面電流和電場分布進行模擬計算。表面電流和電場分布證明:雙諧振分別來源LC諧振和電偶極子諧振。在此基礎之上,分析了附著物的厚度和折射率對其傳感性能的影響,計算結果表明:該傳感器對附著物的折射率和厚度變化非常靈敏,其靈敏度遠大于單諧振型太赫茲超材料傳感器的靈敏度。2.由于超材料吸收器的吸收峰具有非常窄的半波帶寬度(FWHM),并對外界環(huán)境的變化具有較高的靈敏度,設計了一種基于吸收器的三諧振型太赫茲超材料生物傳感器,其結構單元由上下對稱的雙開口環(huán)構成。利用仿真軟件優(yōu)化吸收器的結構參數(shù)和電磁特性,探究吸收器的吸收機理,并分析其傳感性能。表面電流和能流分布顯示:三種諧振模式分別為LC諧振、四偶極子諧振和電偶極子諧振。模擬計算結果表明:三種諧振模式都具有較高的吸收率和靈敏度,并且其靈敏度遠大于通過組合或堆疊而成的多諧振吸收器的靈敏度。
[Abstract]:Metamaterials are a new type of artificial composite electromagnetic materials composed of periodic array of subwavelength elements, which have special electromagnetic properties, such as negative refractive index and negative dielectric constant, which are not possessed by conventional materials in nature. The resonant supermaterial has micro-nano size gap, which can significantly enhance the local electric magnetic field intensity, especially sensitive to the change of the dielectric characteristics of the surrounding environment. The resonant supermaterial can be widely used in the field of sensing detection. At the same time, the photonic energy of terahertz wave is relatively low, which can excite the collective oscillation mode of biomolecules and enhance the sensitivity of detecting biomolecules. In addition, most biomolecules have a specific fingerprint spectrum in terahertz band and have unique advantages in identifying and detecting biomolecules. In this paper, two kinds of terahertz supermaterial biosensors with different structures are designed, one is based on complementary double resonance and the other is based on absorber. The sensitivity of the two sensors is simulated and optimized by the finite element method (FEM) based numerical simulation software HFSS. The main research work is as follows: 1. Design a kind of material biosensor based on complementary double resonance ultra terahertz material. The structure unit is composed of ring clearance. The structural parameters of the sensor are optimized by numerical simulation software. The surface current and electric field distribution are simulated and calculated. It is proved that the double resonance comes from LC resonance and electric dipole resonance respectively. The effect of the thickness and refractive index of the attachment on the sensing performance is analyzed. The calculation results show that the sensor is very sensitive to the change of the refractive index and thickness of the attachment. Its sensitivity is much higher than that of single resonant terahertz supermaterial sensor. 2. Because the absorption peak of the supermaterial absorber has very narrow half-band width FWHM). A three resonant terahertz metamaterial biosensor based on absorber is designed because of its high sensitivity to the change of external environment. The structure unit is composed of a double open loop with symmetry up and down. The structure parameters and electromagnetic characteristics of the absorber are optimized by the simulation software, and the absorption mechanism of the absorber is explored. The sensor performance, surface current and energy flow distribution show that the three resonant modes are LC resonance respectively. Four dipole resonance and electric dipole resonance. The simulation results show that the three resonant modes have high absorptivity and sensitivity. And its sensitivity is much higher than that of multi-resonance absorber formed by combination or stacking.
【學位授予單位】：哈爾濱理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP212.3

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本文編號：1437718