High sensitivity and enhanced measurement range biosensing based on defective photonic crystal microring resonators

Jin-Yue Su; Xun-Qiang Huang; Han-Lei Xu; Jin-Yun Zhou; Jin-Yun Zhou; Zi-Ming Meng; Zi-Ming Meng

doi:10.1364/JOSAB.470215

Journal of the Optical Society of America B
Vol. 39,
Issue 10,
pp. 2831-2839
(2022)
•https://doi.org/10.1364/JOSAB.470215

High sensitivity and enhanced measurement range biosensing based on defective photonic crystal microring resonators

Jin-Yue Su, Xun-Qiang Huang, Han-Lei Xu, Jin-Yun Zhou, and Zi-Ming Meng

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Jin-Yue Su, Xun-Qiang Huang, Han-Lei Xu, Jin-Yun Zhou, and Zi-Ming Meng, "High sensitivity and enhanced measurement range biosensing based on defective photonic crystal microring resonators," J. Opt. Soc. Am. B 39, 2831-2839 (2022)

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Abstract

In this paper, we propose a defective photonic crystal microring resonator (DPhCMRR) by introducing a point defect into a conventional photonic crystal microring resonator (PhCMRR). The defective resonant wavelength within the photonic mode gap and the location of the defect mode distribution can be readily controlled. Unlike conventional PhCMRR, where the free spectral range (FSR) is limited by the dispersive band structure, our DPhCMRR can take advantage of the tunability of the defect mode within the photonic mode gap, leading to a significant increase of the measurement range. Moreover, the bulk refractive index sensitivity can reach 200 nm/RIU (refractive index unit) and the local refractive index sensitivity is about 5 to 10 times larger than that of the conventional PhCMRR. For sensing applications, our DPhCMRR can possess high sensitivity and wide measurement range simultaneously. As proof of principle, it is demonstrated that our proposed DPhCMRR can perform as a sensitive virus biosensor, which can detect a single virus and a concentration of viruses quantitatively. Therefore, our DPhCMRRs can provide a new platform for achieving high sensitivity and wide measurement range biosensing.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Parameter	Numerical Value
Ring radius ( $R$ )	1.403 µm
Ring width ( $w_{r}$ )	0.451 µm
Waveguide width ( $w_{g}$ )	0.37 µm
Coupling gap ( $g$ )	0.2 µm
Number of air holes	24
Period-hole radius ( $r$ )	0.0925 µm
Defect-hole radius ( $r_{d}$ )	0.13 µm
Virus radius ( $r_{v}$ )	0.05 µm
Lattice constant ( $a$ )	0.308 µm
Background index	1.32

Structure	Bulk Sensitivity (S)	Local Sensitivity ( $Δ λ_{r e s}$ )	Quality Factor (Q)	Coupling Strength ( $T_{min}$ )
PhCMRR	160 nm/RIU	0–0.01 nm	757	0.3053
DPhCMRR ( $θ = 0^{\circ}$ )	200 nm/RIU	0.0550 nm	330	0.3639
DPhCMRR ( $θ = 30^{\circ}$ )	160 nm/RIU	0.0628 nm	407	0.3247
DPhCMRR ( $θ = 60^{\circ}$ )	200 nm/RIU	0.0666 nm	351	0.6239
DPhCMRR ( $θ = 90^{\circ}$ )	200 nm/RIU	0.0627 nm	392	0.6973
DPhCMRR ( $θ = 120^{\circ}$ )	200 nm/RIU	0.0784 nm	472	0.7056
DPhCMRR ( $θ = 150^{\circ}$ )	200 nm/RIU	0.1020 nm	526	0.7514
DPhCMRR ( $θ = 180^{\circ}$ )	200 nm/RIU	0.0707 nm	536	0.7430

Parameter	Numerical Value
Ring radius ( $R$ )	1.403 µm
Ring width ( $w_{r}$ )	0.451 µm
Waveguide width ( $w_{g}$ )	0.37 µm
Coupling gap ( $g$ )	0.2 µm
Number of air holes	24
Period-hole radius ( $r$ )	0.0925 µm
Defect-hole radius ( $r_{d}$ )	0.13 µm
Virus radius ( $r_{v}$ )	0.05 µm
Lattice constant ( $a$ )	0.308 µm
Background index	1.32

Structure	Bulk Sensitivity (S)	Local Sensitivity ( $Δ λ_{r e s}$ )	Quality Factor (Q)	Coupling Strength ( $T_{min}$ )
PhCMRR	160 nm/RIU	0–0.01 nm	757	0.3053
DPhCMRR ( $θ = 0^{\circ}$ )	200 nm/RIU	0.0550 nm	330	0.3639
DPhCMRR ( $θ = 30^{\circ}$ )	160 nm/RIU	0.0628 nm	407	0.3247
DPhCMRR ( $θ = 60^{\circ}$ )	200 nm/RIU	0.0666 nm	351	0.6239
DPhCMRR ( $θ = 90^{\circ}$ )	200 nm/RIU	0.0627 nm	392	0.6973
DPhCMRR ( $θ = 120^{\circ}$ )	200 nm/RIU	0.0784 nm	472	0.7056
DPhCMRR ( $θ = 150^{\circ}$ )	200 nm/RIU	0.1020 nm	526	0.7514
DPhCMRR ( $θ = 180^{\circ}$ )	200 nm/RIU	0.0707 nm	536	0.7430

Abstract

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Equations (5)

Journal of the Optical Society of America B