Common-path interferometric label-free protein sensing with resonant dielectric nanostructures.

Light, Science & Applications
Isabel BarthThomas F Krauss

Abstract

Research toward photonic biosensors for point-of-care applications and personalized medicine is driven by the need for high-sensitivity, low-cost, and reliable technology. Among the most sensitive modalities, interferometry offers particularly high performance, but typically lacks the required operational simplicity and robustness. Here, we introduce a common-path interferometric sensor based on guided-mode resonances to combine high performance with inherent stability. The sensor exploits the simultaneous excitation of two orthogonally polarized modes, and detects the relative phase change caused by biomolecular binding on the sensor surface. The wide dynamic range of the sensor, which is essential for fabrication and angle tolerance, as well as versatility, is controlled by integrating multiple, tuned structures in the field of view. This approach circumvents the trade-off between sensitivity and dynamic range, typical of other phase-sensitive modalities, without increasing complexity. Our sensor enables the challenging label-free detection of procalcitonin, a small protein (13 kDa) and biomarker for infection, at the clinically relevant concentration of 1 pg mL-1, with a signal-to-noise ratio of 35. This result indicates the...Continue Reading

References

May 10, 1993·Applied Optics·S S Wang, R Magnusson
Aug 10, 2017·Scientific Reports·Pankaj K SahooJoby Joseph
Aug 11, 2017·Journal of Intensive Care·Ashitha L VijayanManoj G
Feb 13, 2017·Optica·Graham J TriggsThomas F Krauss
Jul 17, 2019·Analytica Chimica Acta·Nuria Fabri-FajaLaura M Lechuga

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Methods Mentioned

BETA
PCT
biosensing
surface plasmon resonance
biosensor
chip
electron-beam lithography

Software Mentioned

MATLAB

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