论文提出了一种用于食品工业中常用添加剂(肌醇、亮氨酸、牛磺酸)高灵敏度区分的太赫兹超材料传感器。该传感器由带有双尖端的开口谐振环(Split Ring Resonator,SRR)阵列组成。液体样品的不同浓度和种类对应于传感器不同的频率偏移,可...论文提出了一种用于食品工业中常用添加剂(肌醇、亮氨酸、牛磺酸)高灵敏度区分的太赫兹超材料传感器。该传感器由带有双尖端的开口谐振环(Split Ring Resonator,SRR)阵列组成。液体样品的不同浓度和种类对应于传感器不同的频率偏移,可以被用于液体样品浓度和种类的区分和辨别。该超材料传感器使用微纳工艺制作在对太赫兹波透明的石英基板上。利用太赫兹时域光谱仪(THz-TDS)系统分别测量了浓度为0.2、0.4、1.5、2、3和4 mg/ml的液体样品。结果表明,所提出的超材料传感器能检测的最低样品浓度为0.2 mg/ml。同时,该传感器也可以实现相同浓度,不同种类液体样品的辨别。该研究为基于开口谐振环结构的太赫兹超材料传感器在食品安全领域的应用提供了新的参考。展开更多
The Ga N high electron mobility transistor(HEMT)has been considered as a potential terahertz(THz)radiation source,yet the low radiation power level restricts their applications.The HEMT array is thought to improve the...The Ga N high electron mobility transistor(HEMT)has been considered as a potential terahertz(THz)radiation source,yet the low radiation power level restricts their applications.The HEMT array is thought to improve the coupling efficiency between two-dimensional(2D)plasmons and THz radiation.In this work,we investigate the plasma oscillation,electromagnetic radiation,and the integration characteristics of Ga N HEMT targeting at a high THz radiation power source.The quantitative radiation power and directivity are obtained for integrated Ga N HEMT array with different array periods and element numbers.With the same initial plasma oscillation phase among the HEMT units,the radiation power of the two-element HEMT array can achieve 4 times as the single HEMT radiation power when the array period is shorter than 1/8electromagnetic wavelength.In addition,the radiation power of the HEMT array varies almost linearly with the element number,the smaller array period can lead to the greater radiation power.It shows that increasing the array period could narrow the main radiated lobe width while weaken the radiation power.Increasing the element number can improve both the radiation directivity and power.We also synchronize the plasma wave phases in the HEMT array by adopting an external Gaussian plane wave with central frequency the same as the plasmon resonant frequency,which solves the problem of the radiation power reduction caused by the asynchronous plasma oscillation phases among the elements.The study of the radiation power amplification of the one-dimensional(1D)Ga N HEMT array provides useful guidance for the research of compact high-power solid-state terahertz sources.展开更多
基金Supported by the National Natural Science Foundation of China(61921002,61988102)。
文摘论文提出了一种用于食品工业中常用添加剂(肌醇、亮氨酸、牛磺酸)高灵敏度区分的太赫兹超材料传感器。该传感器由带有双尖端的开口谐振环(Split Ring Resonator,SRR)阵列组成。液体样品的不同浓度和种类对应于传感器不同的频率偏移,可以被用于液体样品浓度和种类的区分和辨别。该超材料传感器使用微纳工艺制作在对太赫兹波透明的石英基板上。利用太赫兹时域光谱仪(THz-TDS)系统分别测量了浓度为0.2、0.4、1.5、2、3和4 mg/ml的液体样品。结果表明,所提出的超材料传感器能检测的最低样品浓度为0.2 mg/ml。同时,该传感器也可以实现相同浓度,不同种类液体样品的辨别。该研究为基于开口谐振环结构的太赫兹超材料传感器在食品安全领域的应用提供了新的参考。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.92163204,61921002,and 62171098)。
文摘The Ga N high electron mobility transistor(HEMT)has been considered as a potential terahertz(THz)radiation source,yet the low radiation power level restricts their applications.The HEMT array is thought to improve the coupling efficiency between two-dimensional(2D)plasmons and THz radiation.In this work,we investigate the plasma oscillation,electromagnetic radiation,and the integration characteristics of Ga N HEMT targeting at a high THz radiation power source.The quantitative radiation power and directivity are obtained for integrated Ga N HEMT array with different array periods and element numbers.With the same initial plasma oscillation phase among the HEMT units,the radiation power of the two-element HEMT array can achieve 4 times as the single HEMT radiation power when the array period is shorter than 1/8electromagnetic wavelength.In addition,the radiation power of the HEMT array varies almost linearly with the element number,the smaller array period can lead to the greater radiation power.It shows that increasing the array period could narrow the main radiated lobe width while weaken the radiation power.Increasing the element number can improve both the radiation directivity and power.We also synchronize the plasma wave phases in the HEMT array by adopting an external Gaussian plane wave with central frequency the same as the plasmon resonant frequency,which solves the problem of the radiation power reduction caused by the asynchronous plasma oscillation phases among the elements.The study of the radiation power amplification of the one-dimensional(1D)Ga N HEMT array provides useful guidance for the research of compact high-power solid-state terahertz sources.
