Bound States in the Continuum Empower Subwavelength Gratings for Refractometers in Visible

被引:8
作者
Yadav, Gunjan [1 ]
Sahu, Subrat [1 ]
Kumar, Ritesh [1 ]
Jha, Rajan [1 ]
机构
[1] IIT Bhubaneswar, Nanophoton & Plasmon Lab, Sch Basic Sci, Khordha 752050, Odisha, India
关键词
Bound States in the Continuum; Medium Contrast Gratings; Silicon Nitride; Fano Resonance; Sensors; Refractive Index Unit (RIU); LIGHT; EMISSION;
D O I
10.3390/photonics9050292
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
This paper describes a compact refractometer in visible with optical bounds states in the continuum (BICs) using silicon nitride (Si3N4) based sub-wavelength medium contrast gratings (MCGs). The proposed device is highly sensitive to different polarization states of light and allows a wide dynamic range from 1.330 (aqueous environment) to 1.420 (biomolecules) monitoring, apart from its being thermally stable. The proposed sensor has a sensitivity of 363 nm/RIU for X polarized light and 137 nm/RIU for Y polarized light. The spectral characteristics have been obtained with a high angular resolution for the smaller angle of incidence, which confirms the BIC hybrid modes with good quality factors and enhanced field confinement. The device is based on a normal-to-the-surface optical launching strategy to achieve exceptional interrogation stability and alignment-free performance. This system can also be used in the CMOS photodetectors for on-chip label-free biosensing.
引用
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页数:10
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