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Resonant Dielectric Metagratings for Response Intensified Optical Sensing
Author(s) -
Aoni Rifat Ahmmed,
Manjunath Shridhar,
Karawdeniya Buddini I.,
Zangeneh Kamali Khosro,
Xu Lei,
Damry Adam M.,
Jackson Colin J.,
Tricoli Antonio,
Miroshnichenko Andrey E.,
Rahmani Mohsen,
Neshev Dragomir N.
Publication year - 2022
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202103143
Subject(s) - materials science , sensitivity (control systems) , optoelectronics , biosensor , diffraction , footprint , analyte , calibration , optics , wavelength , dielectric , nanotechnology , electronic engineering , physics , paleontology , chemistry , quantum mechanics , engineering , biology
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.