Journal article
Guided-mode resonance on pedestal and half-buried high-contrast gratings for biosensing applications
Tarbiat Modarres University1
Department of Photonics Engineering, Technical University of Denmark2
Metamaterials, Department of Photonics Engineering, Technical University of Denmark3
Department of Health Technology, Technical University of Denmark4
NanoBio Light-Systems, Department of Health Technology, Technical University of Denmark5
Biophotonic Imaging, NanoBio Light-Systems, Department of Health Technology, Technical University of Denmark6
Dosimetry, Hevesy and Dosimetry, Department of Health Technology, Technical University of Denmark7
Optical sensors typically provide compact, fast and precise means of performing quantitative measures for almost any kind of measurand that is usually probed electronically. High-contrast grating (HCG) resonators are known to manifest an extremely sharp and sensitive optical resonance and can constitute a highly suitable sensing platform.
In this paper we present two advanced high-contrast grating designs improving the sensing performances of conventional implementations. These configurations, namely pedestal and half-buried HCGs, allow to enhance the shift of the photonic resonance while maintaining the spectral features of the standard configuration.
First, the spectral feature of the HCGs was numerically optimized to express the sharpest possible resonance when the structure is immersed in serum. Second, the sensing properties of conventional and advanced HCG implementations were studied by modelling the biological entities to be sensed as a thin dielectric coating layer of increasing thickness.
Pedestal HCGs were found to provide a ∼ 12% improvement in sensitivity and a six-fold improvement in resonance quality factor (Q-factor), while buried HCGs resulted in a ∼ 58% improvement in sensitivity at the expense of a slightly broader resonance. Such structures may serve as an improved sensitive biosensing platform for near-infrared spectroscopy.
Language: | English |
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Publisher: | De Gruyter |
Year: | 2021 |
Pages: | 4289-4296 |
ISSN: | 21928614 and 21928606 |
Types: | Journal article |
DOI: | 10.1515/nanoph-2021-0347 |
ORCIDs: | 0000-0002-1218-1924 , Takayama, Osamu , Vertchenko, Larissa , Malureanu, Radu , Lindvold, Lars René , Andersen, Peter E. and Lavrinenko, Andrei V. |