한국광학회지 (Korean Journal of Optics and Photonics)

  • 제29권6호
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  • Pages.268-274
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  • 2018
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  • 1225-6285(pISSN)
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  • 2287-321X(eISSN)
한국광학회 (Optical Society of Korea)
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금속-유기 구조체를 이용한 포토닉 크리스탈 기반의 효율적인 습도 컬러 센서

Efficient Humidity Color Sensor Based on a Photonic Crystal with a Metal-Organic Framework

  • 김준용 (경북대학교 IT대학 전자공학부) ;
  • 이성학 (경북대학교 IT대학 전자공학부) ;
  • 도윤선 (경북대학교 IT대학 전자공학부)
  • Kim, Jun Yong (School of Electronics Engineering, Kyungpook National University) ;
  • Lee, Sung Hak (School of Electronics Engineering, Kyungpook National University) ;
  • Do, Yun Seon (School of Electronics Engineering, Kyungpook National University)
  • 투고 : 2018.09.20
  • 심사 : 2018.11.03
  • 발행 : 2018.12.25
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초록

본 연구에서는 1차원 포토닉 크리스탈과 금속-유기 구조체 (MOF) 물질인 Hong Kong University of Science and Technology(HKUST-1)을 이용한 수분 감지 컬러 센서를 제안한다. 1차원 포토닉 크리스탈은 주기적인 굴절률 변화에 의해 포토닉 밴드갭이 존재하고, 특정한 파장 대역의 광 성분을 차단 및 반사한다. HKUST-1의 굴절률은 건조한 환경과 습한 환경에서 그 값이 서로 다르다. 여기서 우리는 포토닉 밴드갭의 유무를 활용하여 FDTD 시뮬레이션으로 센서를 설계하였다. 광학 해석 결과, 투과된 광의 색 변환보다 반사된 광의 색 변환이 우수하여 반사된 광을 이용하였다. 그리고 포토닉 밴드갭의 중심 파장이 550 nm인 경우, 건조한 환경 대비 습한 환경의 최대 피크 값이 약 9.5배로 증가했으며, 무채색에서 녹색으로 색 변환이 가능하여 센서로의 특성이 우수하였다. 본 연구 결과는 MOF 물질의 수분 감지 컬러 센서로의 활용을 제시하였으며, MOF 물질의 나노 구조 설계로 산업 디바이스로의 활용성도 확대할 것이다.

In this study we suggest a humidity-sensitive color sensor using a one-dimensional photonic crystal and Hong Kong University of Science and Technology-1 (HKUST-1), which is a metal-organic framework (MOF) substance. One-dimensional photonic crystals have a photonic band gap, due to a periodic refractive-index change, and block and reflect light components in a specific wavelength band. The refractive index of HKUST-1 differs in dry and humid environments. Herein we designed a sensor using the presence of the photonic band gap, with FDTD simulation. As a result of optical analysis, the color conversion of the reflected light was superior to the color conversion of the transmitted light. When the center wavelength of the photonic band gap was 550 nm, the maximum peak value of the wet environment increased by a factor of about 9.5 compared to the dry environment, and the color conversion from achromatic to green was excellent as a sensor. The results of this study suggest the application of MOF materials to moisture sensors, and the nanostructure design of MOF materials will expand the applications to industrial devices.

키워드

KGHHBU_2018_v29n6_268_f0001.png 이미지

Fig. 1. Conceptual diagram of the 1-dimension photonic crystal for moisture sensing color sensor.

KGHHBU_2018_v29n6_268_f0003.png 이미지

Fig. 3. Measured spectra at different numbers of layers. (a-c) The HKUST-1 is exposed to a dry environment, and the specific wavelengths are (a) 400 nm, (b) 550 nm, and (c) 650 nm. (d-f) The HKUST-1 is exposed to a wet environment, and the specific wavelengths are (d) 400 nm, (e) 550 nm, and (f) 650 nm.

KGHHBU_2018_v29n6_268_f0004.png 이미지

Fig. 4. Movement of color coordinate along with change in number of layers. The color conversion according to the refractive index change of HKUST-1 is expressed as lines. Color coordinate for number of layers (a) SPB-B, (b) SPB-G, (c) SPB-R, (d) Color conversion difference according to the number of layers.

KGHHBU_2018_v29n6_268_f0005.png 이미지

Fig. S1. (a) Spectral response characteristics of the rod and three cone cells. (b) Spectral luminous efficiency function, V (λ): photopic vision, V’ (λ): scotopic vision.

KGHHBU_2018_v29n6_268_f0006.png 이미지

Fig. S2. Color conversion difference of the transmittance and reflectance.

KGHHBU_2018_v29n6_268_f0007.png 이미지

Fig. 2. The spectra and color coordinate of transmittance and reflectance of HKUST-1 in dry and wet environments at a center wavelength 550 nm of the photonic band gap. (a) Transmittance and reflectance spectra, (b) Color coordinate for transmittance and reflectance.

Table 1. Calculated thickness of CaF2 and HKUST-1 for specific wavelength

KGHHBU_2018_v29n6_268_t0001.png 이미지

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