Common-mode plasmon sensing scheme as a high-sensitivity compact SPR sensor

Article Chemistry, Analytical

Differential Sensing with Replicated Plasmonic Gratings Interrogated in the Optical Switch Configuration

Emilie Laffont et al.

Summary: A new plasmonic configuration is proposed for a sensor, which can detect the refractive index variations of solutions. This configuration utilizes two diffracted orders resulting from the interaction of a TM-polarized optical beam and a grating coupler, based on the optical switch effect. Experimental results show that the differential measurements from the two monitored diffracted orders cancel out the common drifting and perturbations, leading to an improved detection limit. Bulk sensing is achieved by sequentially injecting solutions of glycerol in water into a fluidic cell using intensity interrogation. The configuration is cost-effective and shows great promise for real-time detection of biological species.

SENSORS (2023)

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Article Optics

Effect of roughness on surface plasmons propagation along deep and shallow metallic diffraction gratings

Hugo Bruhier et al.

Summary: This study deeply analyzes the influence of the roughness of shallow or deep metallic diffraction gratings on the propagation of surface plasmon mode along the metallic-air interface. It is found that the scattering losses lead to a spectral or angular broadening of the surface plasmon resonance (SPR) and a shift of the resonance wavelength and coupling angle. These effects need to be overcome when using such structures, especially deep ones, as SPR-based sensors.

OPTICS LETTERS (2022)

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Article Optics

On the performance of a tunable grating-based high sensitivity unidirectional plasmonic sensor

Javier Gonzalez-Colsa et al.

Summary: Optical biosensing is a highly active research area in demand of selective, sensitivity-enhanced, and low-cost devices. This work proposes a novel grating-based gold metasurface that acts as both a high sensitivity sensor and unidirectional plasmon source. Understanding the influence of each parameter on the device's performance is crucial for designing biosensors based on grating structures.

OPTICS EXPRESS (2021)

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Article Optics