Resonant dielectric metagratings for response intensified optical sensing

Aoni, RA, Manjunath, S, Karawdeniya, BI, Zangeneh Kamali, K, Xu, L ORCID: https://orcid.org/0000-0001-9071-4311, Damry, AM, Jackson, CJ, Tricoli, A, Miroshnichenko, AE, Rahmani, M ORCID: https://orcid.org/0000-0001-9268-4793 and Neshev, DN, 2021. Resonant dielectric metagratings for response intensified optical sensing. Advanced Functional Materials: 2103143. ISSN 1616-301X

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Abstract

The development of nanoscale optical sensors is desirable for a broad range of applications, including wearable medical-diagnostics, biochemical detection, and environmental monitoring. Optical detection platforms based on resonant nanostructures are the golden standard for miniaturized footprint and high optical sensitivity. These sensors function by measuring a shift in resonance wavelength upon binding of analytes to their surface. However, such measurements are sensitive to intensity fluctuations of the illuminating source and its wavelength calibration, which limits their applicability. Here, a novel optical sensing concept based on diffraction measurements from resonant dielectric metagratings is proposed and experimentally demonstrated. It is shown that this approach enables the direct measurement of unknown analytes with enhanced sensitivity and without the need for intensity calibrations. The intensified sensitivity of this metagrating-sensor is derived from combining the resonant phenomena of the nanostructures with the tailored diffraction from the metagrating, thereby providing the highest sensitivity demonstrated to date amongst grating-based sensors. As a proof of concept, the metagrating-sensor was validated using an antibody binding assay, achieving a femtomolar-level limit of detection. Due to their high sensitivity and robust performance, the proposed metagrating sensors pave the way for novel miniaturized medical diagnostics and biosensing applications.

Item Type:	Journal article
Publication Title:	Advanced Functional Materials
Creators:	Aoni, R.A., Manjunath, S., Karawdeniya, B.I., Zangeneh Kamali, K., Xu, L., Damry, A.M., Jackson, C.J., Tricoli, A., Miroshnichenko, A.E., Rahmani, M. and Neshev, D.N.
Publisher:	Wiley
Date:	4 August 2021
ISSN:	1616-301X
Identifiers:	Number Type 10.1002/adfm.202103143 DOI 1486650 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Jonathan Gallacher
Date Added:	15 Nov 2021 09:01
Last Modified:	04 Aug 2022 03:00
URI:	https://irep.ntu.ac.uk/id/eprint/44766

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