Hybrid graphene-based photonic-plasmonic biochemical sensor with a photonic and acoustic cavity structure

Chan Shan Yang*, Yi Sheng Cheng, Young Chou Hsu, Yi Cheng Chung, Jing Ting Hung, Chien Hao Liu, Jin Chen Hsu, Cheng Ying Chen, Chii Rong Yang, Yu Tai Li, Nan Nong Huang*, Tzy Rong Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


In this study, we propose a biochemical sensor that features a photonic cavity integrated with graphene. The tunable hybrid plasmonic-photonic sensor can detect the molecular finger-prints of biochemicals with a small sample volume. The stacking sequence of the device is “ITO grating/graphene/TiO2 /Au/Si substrate”, which composes a photonic band gap structure. A defect is created within the ITO gratings to form a resonant cavity. The plasmonic-photonic energy can be confined in the cavity to enhance the interaction between light and the analyte deposited in the cavity. The finite element simulation results indicated that the current sensor exhibits very high values in resonance shift and sensitivity. Moreover, the resonance spectrum with a broad resonance linewidth can identify the molecular vibration bands, which was exemplified by the fingerprint detections of protein and the chemical compound CBP. The sensor possesses an electrical tunability by including a graphene layer, which allowed us to tune the effective refractive index of the cavity to increase the sensor’s sensing performance. In addition, our device admits a phononic bandgap as well, which was exploited to sense the mechanical properties of two particular dried proteins based on the simplified elastic material model instead of using the more realistic viscoelastic model. The dual examinations of the optical and mechanical properties of analytes from a phoxonic sensor can improve the selectivity in analyte detections.

Original languageEnglish
Article number1175
Issue number10
Publication statusPublished - 2021 Oct


  • Biochemical sensor
  • Graphene
  • Photonic cavity
  • Phoxonic crystal
  • Plasmon

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Materials Science
  • Condensed Matter Physics
  • Inorganic Chemistry


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