Development of Iris Recognition Filter with Low-Angle Effect

Dongmei Liu; Pengfei Yue; Xiuhua Fu; Jing Zhang; HongYu Cao; Shuang Li

doi:10.3788/AOS201939.1131002

Acta Optica Sinica, Volume. 39, Issue 11, 1131002(2019)

Development of Iris Recognition Filter with Low-Angle Effect

Dongmei Liu^1、**, Pengfei Yue^1、*, Xiuhua Fu¹, Jing Zhang¹, HongYu Cao¹, and Shuang Li²

Author Affiliations

¹School of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, China

²Optorun (Shanghai) Co., Ltd., Shanghai 200444, China

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Figures & Tables(16)

$Optical constants of Si-H materials under different H2 gas flows. (a) Refractive index; (b) extinction coefficient$

Fig. 1. Optical constants of Si-H materials under different H₂ gas flows. (a) Refractive index; (b) extinction coefficient

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$Optical constants of Si-H materials. (a) Refractive index; (b) extinction coefficient$

Fig. 2. Optical constants of Si-H materials. (a) Refractive index; (b) extinction coefficient

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$Optical constants of Si3N4 materials. (a) Refractive index; (b) extinction coefficient$

Fig. 3. Optical constants of Si₃N₄ materials. (a) Refractive index; (b) extinction coefficient

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$Optical constants of SiO2 materials. (a) Refractive index; (b) extinction coefficient$

Fig. 4. Optical constants of SiO₂ materials. (a) Refractive index; (b) extinction coefficient

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Fig. 5. Front surface theoretical spectral curve

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Fig. 6. Back surface theoretical spectral curve

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Fig. 7. Double-sided transmission theoretical spectral curve

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Fig. 8. Front surface spectral test curve

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Fig. 9. Back surface spectral test curve

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Fig. 10. Spectral test curve of sample 1 after boiling for 0.5 h

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Fig. 11. Spectral test curve of sample 1 after adjusting the process and boiling for 0.5 h

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Fig. 12. Comparison of design curve and actual test curve

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Table 1. Designed spectral parameters of filter

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Table 1. Designed spectral parameters of filter

Item	AOI
Item	0°	38°
Shift /nm	-	<20
Low-stopband (min) /nm	400	400
Low-stopband (max) /nm	890-920	870-900
SW-transmission (average) /%	<0.1	<0.1
SW-transmission (max) /%	<1.0	<1.0
Centre wavelength /nm	950	930
Passband /nm	925-975	905-955
Passband-transmission (average) /%	≥92	≥92
Full width at half maximum /nm	52-58	52-58
High-stopband (min) /nm	980-1010	960-990
High-stopband (max) /nm	1100	1100
LW-transmission (average) /%	<0.3	<0.3
LW-transmission (max) /%	<0.5	<0.5

Table 2. Optical constants of Si-H at 950 nm under different H₂ gas flows
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Table 2. Optical constants of Si-H at 950 nm under different H₂ gas flows
Gas flow /(mL·min^-1) n k
90 3.469 1.79×10^-4
100 3.429 1.37×10^-4
110 3.400 3.93×10^-5
120 3.308 3.40×10^-5
130 3.249 2.28×10^-5

Table 3. Optical constants of materials used in design
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Table 3. Optical constants of materials used in design
Materials n k
Si-H 3.400 3.93×10^-5
Si₃N₄ 2.015 1.85×10^-6
SiO₂ 1.442 0

Table 4. Process parameters
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Table 4. Process parameters
Materials TG1/2-Si ICP*2
Power /kW Ar flow /(mL·min^-1) Power /kW Ar flow /(mL·min^-1) O₂ flow /(mL·min^-1) H₂ flow /(mL·min^-1) N₂ flow /(mL·min^-1)
Si-H 13 280 3 600 0 110 0
Si₃N₄ 12 280 2 600 0 0 560
SiO2 15 280 4 120 240 0 0

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Dongmei Liu, Pengfei Yue, Xiuhua Fu, Jing Zhang, HongYu Cao, Shuang Li. Development of Iris Recognition Filter with Low-Angle Effect[J]. Acta Optica Sinica, 2019, 39(11): 1131002

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