Multiscale and Multiple Physical Quantities Sensor Based on Nonreciprocal Evanescent Wave in the One-Dimensional Photonic Crystals

In this study, the nonreciprocal evanescent waves associated with the one-dimensional ternary photonic crystals constructed by magnetized plasma layers and two dielectric layers and terminated with two prisms are investigated. The plasma frequency and the plasma cyclotron frequency obviously affect the quality factor value and the transmittance of the counter-propagating evanescent waves in a regular way, then the counter-propagating target resonates peaks for sensing is acquired through the parameter optimization. Whereby, the multiscale sensor benefits from the nonreciprocity can be applied to simultaneously measure magnetic induction intensity, plasma density, incident angle, and refractive index in two scales, which is unprecedented in existence. Numerical investigations of the sensing performance parameters such as linear range, sensitivity, quality factor value, the figure of merit are performed by the transfer matrix method. The sensitivity and quality factor values of the two scales respectively are 8.27×10
⁹
T
^-1
, 6.07×10
⁹
T
^-1
, 18848.48, 12009.71, 5.82×10
^-11
m
³
, 4.56×10
^-11
m
³
, 10452.26, 11588.24, 0.02109 (2πc/d) ·degree
^-1
, 0.00508 (2πc/d) ·degree
^-1
, 4487.35, 5164.47, 0.02093 (2πc/d) ·RIU
^-1
, 0.00648 (2πc/d) ·RIU
^-1
, 4024.47, 4647.56. Surpassing the traditional sensor, the proposed structure which is equipped with multiple physical quantities measurement in two scales can have numerous potential applications for sensing.