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In this research, a refractive index sensing based on quasi-bound states in the continuum (Q-BIC) at visible wavelength was demonstrated. Via internal excitation, Q-BIC can lase at the resonance wavelength, and the FWHM can much smaller than the reflectance resonance peak; thus, the FoM can be extensively improved. This Q-BIC sensing structure achieves a sensitivity of 191.91 nm/RIU and FoM is 611.47 on experiment.
© 2022 Japan Society of Applied Physics, Optica Publishing Group
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