Open AccessRefractive index sensor with alternative high performance using black phosphorus in the all-dielectric configuration
Author(s) -
Yijun Cai,
Junao Zhang,
Yuanguo Zhou,
Chengying Chen,
Feng Lin,
Lin Wang
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.433195
Subject(s) - refractive index , figure of merit , dielectric , materials science , optics , sensitivity (control systems) , optoelectronics , anisotropy , electronic engineering , physics , engineering
We theoretically propose a nonplasmonic optical refractive index sensor based on black phosphorus (BP) and other dielectric materials in the infrared band. Due to the anisotropic property of BP, the proposed sensor can achieve alternative sensitivity and figure of merit (FOM) in its different crystal directions. The high sensitivity and FOM are attributed to the strong magnetic resonance in the all-dielectric configuration. The coupled-mode theory (CMT) is used to verify the simulation results and reveal the physical mechanism. Furthermore, influences of the sample and the incident angle on the performance of the sensor are also discussed. Our design utilizes a simple dielectric structure with a BP monolayer, which exhibits great potential for the future high-performance sensor with low cost.