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Terahertz living cell analysis is a hot spot in the field of spectral research, and its main difficulty lies in how to effectively avoid the interference of water and carry out sensitive analysis and detection of samples in liquid phase environment. In order to reduce the strong absorption of terahertz by water when testing solution samples, and improve the sensitivity of the sensor. In this paper, a terahertz microfluidic biosensor based on metamaterial absorber is designed. The sensor chip integrates metamaterial absorber and microfluidic channel. There are two perfect absorption peaks in 0.69 THz and 0.95 THz in THz band, and the refractive index sensitivity can reach 305 GHz/RIU. The experimental results show that the proposed dual-band terahertz sensors are insensitive to polarization and wide incident angle. In addition, when the samples with different refractive index pass through the microfluidic channel, the high and low resonance peaks show different red shifts, and then the material detection is realized by analyzing the red shift difference between the high and low resonance peaks of different substances. Therefore, the metamaterial terahertz microfluidic biosensor has a good application potential in the field of unlabeled trace matter detection, and can provide new ideas for terahertz biomedical research.
Microfluidic, Absorber, Terahertz, Biosensor.
JIANJUN LIU, LANLAN FAN, XUEHUA SHEN, Terahertz microfluidic biosensor based on metamaterial absorber, Optoelectronics and Advanced Materials - Rapid Communications, 17, 1-2, January-February 2023, pp.1-7 (2023).
Submitted at: April 2, 2022
Accepted at: Feb. 6, 2023