期刊
SENSORS
卷 18, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/s18124489
关键词
surface plasmon resonance; refractive sensing; graphene
资金
- National Natural Science Foundation of China (NNSFC) [51606158, 11604311, 61705204, 21506257, 11847132]
- SWUST [17LZX452]
- Postgraduate Innovation Fund Project by Southwest University of Science and Technology [18ycx034, cx18-060]
In the present study, we design a tunable plasmonic refractive index sensor with nanoring-strip graphene arrays. The calculations prove that the nanoring-strip have two transmission dips. By changing the strip length L of the present structure, we find that the nanoring-strip graphene arrays have a wide range of resonances (resonance wavelength increases from 17.73 mu m to 28.15 mu m). When changing the sensing medium refractive index n(med), the sensitivity of mode A and B can reach 2.97 mu m/RIU and 5.20 mu m/RIU. By changing the doping level n(g), we notice that the transmission characteristics can be tuned flexibly. Finally, the proposed sensor also shows good angle tolerance for both transverse magnetic (TM) and transverse electric (TE) polarizations. The proposed nanoring-strip graphene arrays along with the numerical results could open a new avenue to realize various tunable plasmon devices and have a great application prospect in biosensing, detection, and imaging.
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