Terahertz Vibrational Fingerprints Detection of Molecules with Particularly Designed Graphene Biosensors
In this research, an arc I-shaped graphene sensing structure with multi-resonance characteristics is proposed for the simultaneous detection of vibrational fingerprints with spectral separation in the terahertz range. The resonant frequencies of the sensor can be dynamically tuned by changing the ga...
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| Format: | Article |
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MDPI AG
2022-09-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/19/3422 |
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| author | Xiaobing Han Xueqin Shen Yuanguo Zhou Lin Wang Qiang Ren Yijun Cai Reza Abdi-Ghaleh |
| author_facet | Xiaobing Han Xueqin Shen Yuanguo Zhou Lin Wang Qiang Ren Yijun Cai Reza Abdi-Ghaleh |
| author_sort | Xiaobing Han |
| collection | DOAJ |
| description | In this research, an arc I-shaped graphene sensing structure with multi-resonance characteristics is proposed for the simultaneous detection of vibrational fingerprints with spectral separation in the terahertz range. The resonant frequencies of the sensor can be dynamically tuned by changing the gate voltage applied to the graphene arrays. The two vibrational fingerprints of lactose molecules (0.53 THz and 1.37 THz) in the transmission spectrum can be enhanced simultaneously by strictly optimizing the geometrical parameters of the sensor. More importantly, these two resonant frequencies can be tuned precisely to coincide with the two standard resonances of the lactose molecule. The physical mechanism of the sensor is revealed by inspection of the electric field intensity distribution, and the advantage of the sensor, which is its ability to operate at a wide range of incident angles, has been demonstrated. The sensing performance of the structure as a refractive index sensor has also been studied. Finally, a double arc I-shaped graphene sensor is further designed to overcome the polarization sensitivity, which demonstrates excellent molecular detection performance under different polarization conditions. This study may serve as a reference for designing graphene biosensors for molecular detection. |
| first_indexed | 2024-03-09T21:21:28Z |
| format | Article |
| id | doaj.art-1d6b79c535414af08cd653ca8acbdd29 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T21:21:28Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-1d6b79c535414af08cd653ca8acbdd292023-11-23T21:19:47ZengMDPI AGNanomaterials2079-49912022-09-011219342210.3390/nano12193422Terahertz Vibrational Fingerprints Detection of Molecules with Particularly Designed Graphene BiosensorsXiaobing Han0Xueqin Shen1Yuanguo Zhou2Lin Wang3Qiang Ren4Yijun Cai5Reza Abdi-Ghaleh6College of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaCollege of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaCollege of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Electronics and Information Engineering, Beihang University, Beijing 100191, ChinaSchool of Electronics and Information Engineering, Beihang University, Beijing 100191, ChinaFujian Provincial Key Laboratory of Optoelectronic Technology and Devices, Xiamen University of Technology, Xiamen 361024, ChinaDepartment of Laser and Optical Engineering, University of Bonab, Bonab 5551761167, IranIn this research, an arc I-shaped graphene sensing structure with multi-resonance characteristics is proposed for the simultaneous detection of vibrational fingerprints with spectral separation in the terahertz range. The resonant frequencies of the sensor can be dynamically tuned by changing the gate voltage applied to the graphene arrays. The two vibrational fingerprints of lactose molecules (0.53 THz and 1.37 THz) in the transmission spectrum can be enhanced simultaneously by strictly optimizing the geometrical parameters of the sensor. More importantly, these two resonant frequencies can be tuned precisely to coincide with the two standard resonances of the lactose molecule. The physical mechanism of the sensor is revealed by inspection of the electric field intensity distribution, and the advantage of the sensor, which is its ability to operate at a wide range of incident angles, has been demonstrated. The sensing performance of the structure as a refractive index sensor has also been studied. Finally, a double arc I-shaped graphene sensor is further designed to overcome the polarization sensitivity, which demonstrates excellent molecular detection performance under different polarization conditions. This study may serve as a reference for designing graphene biosensors for molecular detection.https://www.mdpi.com/2079-4991/12/19/3422terahertz biosensorsgraphenemetasurfacesurface plasmonsmolecular vibrational fingerprints |
| spellingShingle | Xiaobing Han Xueqin Shen Yuanguo Zhou Lin Wang Qiang Ren Yijun Cai Reza Abdi-Ghaleh Terahertz Vibrational Fingerprints Detection of Molecules with Particularly Designed Graphene Biosensors Nanomaterials terahertz biosensors graphene metasurface surface plasmons molecular vibrational fingerprints |
| title | Terahertz Vibrational Fingerprints Detection of Molecules with Particularly Designed Graphene Biosensors |
| title_full | Terahertz Vibrational Fingerprints Detection of Molecules with Particularly Designed Graphene Biosensors |
| title_fullStr | Terahertz Vibrational Fingerprints Detection of Molecules with Particularly Designed Graphene Biosensors |
| title_full_unstemmed | Terahertz Vibrational Fingerprints Detection of Molecules with Particularly Designed Graphene Biosensors |
| title_short | Terahertz Vibrational Fingerprints Detection of Molecules with Particularly Designed Graphene Biosensors |
| title_sort | terahertz vibrational fingerprints detection of molecules with particularly designed graphene biosensors |
| topic | terahertz biosensors graphene metasurface surface plasmons molecular vibrational fingerprints |
| url | https://www.mdpi.com/2079-4991/12/19/3422 |
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