Hybrid Graphene-Based Photonic-Plasmonic Biochemical Sensor with a Photonic and Acoustic Cavity Structure

Crystals

Yu-Tai Li¹  Cheng-Ying Chen²  Chien-Hao Liu³  Jin-Chen Hsu⁴  Nan-Nong Huang⁵  Yi-Cheng Chung⁵  Tzy-Rong Lin⁵  Jing-Ting Hung⁶  Chii-Rong Yang⁶  Yi-Sheng Cheng⁷  Young-Chou Hsu⁷  Chan-Shan Yang⁷ 

[1] Center for Measurement Standards, Industrial Technology Research Institute, Hsinchu 31040, Taiwan;Center for Plasma and Thin Film Technologies (CPTFT), Department of Materials Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan;Department of Mechanical Engineering, National Taiwan University, Taipei 10617, Taiwan;Department of Mechanical Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan;Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan;Department of Mechatronic Engineering, National Taiwan Normal University, Taipei 10610, Taiwan;Institute & Undergraduate Program of Electro-Optical Engineering, National Taiwan Normal University, Taipei 11677, Taiwan;

关键词: graphene;    plasmon;    photonic cavity;    phoxonic crystal;    biochemical sensor;   

DOI  :  10.3390/cryst11101175

来源: DOAJ

【 摘 要 】

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 fingerprints 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.

【 授权许可】

Unknown