Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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A Study on Resonance Properties of a Terahertz Asymmetric Split-Loop Resonator Type Metamaterial for High Quality Factor

테라헤르츠 비대칭 분리고리공진기 메타물질의 높은 품질인자를 위한 공진 특성에 관한 연구

  • Received : 2016.09.22
  • Accepted : 2016.11.10
  • Published : 2016.11.30
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Abstract

A terahertz asymmetric split-loop resonator (ASLR) was analyzed for use in high-sensitivity sensing applications. Its structural asymmetricity induces an asymmetric Fano resonance which has a high quality factor compared to the symmetric eigen-resonance. The variations of the resonant frequency, transmission coefficient, and quality factor of the ASLR in the eigen and Fano resonances are analyzed as a function of its structural asymmetricity. Also, the surface current densities on the ASLR in both resonances are calculated to analyze the main cause of the variations of its transmission characteristics. The surface current of the ASLR in the eigen resonance shows a dipole resonance, which increases the radiation loss and reduces the quality factor. On the other hand, the surface current of the ASLR in the Fano resonance shows a trapped or quadrupole mode which has a low radiation loss. Therefore, the ASLR operated in the Fano resonance has a high quality factor. Terahertz, high-performance filters and high sensitivity sensors can be developed based on our analysis results of the ASLR having a high quality factor. These high-performance devices based on terahertz metamaterials could increase the adoption of terahertz industrial applications.

본 논문에서는 높은 감도의 테라헤르츠 센서로 응용이 가능한 고품질 비대칭 분리고리공진기(ASLR: Asymmetric Split-Loop Resonator) 메타물질의 구조적인 비대칭 정도에 따른 ASLR의 공진특성 변화를 전자기 시뮬레이션을 통하여 분석하였다. 특히, ASLR의 구조적 비대칭성은 높은 품질인자를 갖는 파노공진을 발생시키므로 ASLR의 비대칭성 정도에 따라서 ASLR 고유공진과 파노공진의 공진주파수 변화와 투과계수 및 품질인자의 변화를 분석하였다. 또한, ASLR의 구조적 비대칭성에 따른 ASLR의 공진 특성 변화의 원인을 분석하기 위해 표면전류밀도를 계산하여 ASLR 공진의 공진주파수, 투과계수, 그리고 품질인자가 변화하는 이유를 분석하였다. 이를 통하여 ASLR 고유공진의 표면전류밀도는 이중 극자를 형성하여 높은 방사 손실을 가지게 되므로 품질인자가 낮아지게 되고, 파노공진의 표면전류밀도는 닫힌 모드 또는 사중 극자를 형성하여 이중 극자에 비하여 낮은 방사 손실을 가지므로 파노공진 상태의 ASLR이 높은 품질인자를 가지게 됨을 확인하였다. 이러한 ASLR의 파노공진 특성 분석 결과를 바탕으로 메타물질의 비대칭성을 조절하면 높은 품질인자를 가지는 테라헤르츠 고성능 필터 또는 고감도 센서 개발이 가능하다. 이러한 고감도 고성능 테라헤르츠 소자 개발은 테라헤르츠 메타물질의 실질적인 산업 응용을 유도할 것으로 기대한다.

Keywords

References

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