Proposal of two tangent air hole structure for higher sensitivity gas sensor

Zan Hui Chen, Wenying Li, Yu Han, Haisong Jiang, Kiichi Hamamoto

Research output: Contribution to journalArticle

Abstract

One-dimensional photonic crystal (1D PhC) cavities are used as ultrasensitive gas sensors due to their high sensitivity to changes in the surrounding environment. One of the issues for typical 1D PhC-based sensors is that the confined optical field does not fully overlap with analytes, which therefore leads to low sensitivity. Herein, we propose and numerically investigate a photonic crystal cavity by introducing a two tangent air hole array to improve the gas refractive index sensitivity. We also investigate the spectral feature of the proposed photonic crystal cavity for varying structure parameters and methane gas concentration. In addition, the coupling efficiency of the waveguide and the influence of the temperature on the proposed structure for sensing applications are analyzed. Theoretical analysis reveals that the proposed two tangent hole structure simultaneously achieves a high sensitivity (353 nm/RIU) and figure of merit (FOM = 1.2 × 104) compared to those observed in previous studies.

Original languageEnglish
Article numberSJJD03
JournalJapanese Journal of Applied Physics
Volume58
Issue numberSJ
DOIs
Publication statusPublished - Jan 1 2019

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Photonic crystals
Chemical sensors
tangents
proposals
sensitivity
sensors
air
photonics
Air
gases
cavities
crystals
Gases
Refractive index
Methane
Waveguides
figure of merit
methane
Sensors
refractivity

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Proposal of two tangent air hole structure for higher sensitivity gas sensor. / Chen, Zan Hui; Li, Wenying; Han, Yu; Jiang, Haisong; Hamamoto, Kiichi.

In: Japanese Journal of Applied Physics, Vol. 58, No. SJ, SJJD03, 01.01.2019.

Research output: Contribution to journalArticle

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