Optimizing the quality factor of a wideband guided-mode resonance biosensor

Design of a Label-Free, Distributed Bragg Grating Resonator Based Dielectric Waveguide Biosensor

“…Nonetheless, to ensure overlap of the device spectrum with the tuning range of the proposed interrogating VCSEL laser ΔλVCSEL and considering Equations (5) and (11), the optimal resonator length dopt is given by Together with Equations (9)- (11) it becomes evident that a low LoD is the result of the combination of large wavelength shifts Δλshift per cover refractive index change ∆nc (or more general the sensitivity S = Δλ⁄∆nc ) in combination with a small FWHM. The higher the sensitivity and the Q-factor, the lower the LoD.…”

“…Sophisticated micro-sphere, disc and ring resonator sensors with low limit of detection (LoD) and high quality factors (Q-factor) have been realized but seem not to be suitable for volume production due to their high level of complexity regarding fabrication and light coupling. In contrast, grating based waveguide sensors can be batch produced by standard lithographic means and light can easily be coupled via the diffractive grating itself, but exhibit lower Q-factors and therefore higher LoD [11]. In this work, we introduce a distributed Bragg grating resonator waveguide biosensor, combining the simplicity of grating couplers with a high finesse and extended dynamic range of resonant cavities.…”

Dual‐channel glucose concentration sensor based on coupled cross‐stacked gratings

“…Guided-mode resonance (GMR) wavelength relies on the surrounded refractive index (RI), for which the GMR-based device can be engineered as RI sensor with high performance due to its extreme narrow linewidth and high sensitivity to surrounding analytes. [1][2][3][4] When GMR phenomenon occurs, [5][6][7] the diffraction orders excite a waveguide mode that couples out and interferes with the zeroth order mode to form resonant peaks under a resonance condition. 8,9 For RI biosensor, classical designs based on a single-channel biosensor could make it difficult for the analyte to reduce the nonsystematic errors under the environment disturbance.…”