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.
机构:
Nonlinear Physics Center of the Australian National University in Canberra, ITMO University, St. Petersburg
ITMO University, St PetersburgNonlinear Physics Center of the Australian National University in Canberra, ITMO University, St. Petersburg
Koshelev K.
Bogdanov A.
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机构:
ITMO University, St PetersburgNonlinear Physics Center of the Australian National University in Canberra, ITMO University, St. Petersburg
Bogdanov A.
Kivshar Y.
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机构:
Nonlinear Physics Center of the Australian National University in Canberra, ITMO University, St. Petersburg
ITMO University, St PetersburgNonlinear Physics Center of the Australian National University in Canberra, ITMO University, St. Petersburg
机构:Dipartimento di Fisica- Politecnico di Milano and Istituto di Fotonica e Nanotecnologie - Consiglio Nazionale delle Ricerche Piazza Leonardo da Vinci,
Stefano Longhi
Giuseppe Della Valle
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机构:Dipartimento di Fisica- Politecnico di Milano and Istituto di Fotonica e Nanotecnologie - Consiglio Nazionale delle Ricerche Piazza Leonardo da Vinci,
机构:
Univ Paris 11, CNRS, Lab Collis Atom & Mol, UMR 8625, F-91405 Orsay, FranceUniv Paris 11, CNRS, Lab Collis Atom & Mol, UMR 8625, F-91405 Orsay, France
Borisov, A. G.
Shabanov, S. V.
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机构:
Univ Florida, Dept Math, Gainesville, FL 32611 USAUniv Paris 11, CNRS, Lab Collis Atom & Mol, UMR 8625, F-91405 Orsay, France