[20p-C304-1~14] 4.1 Plasmonics and Nanophotonics

▲ [20p-C304-10] Refractive index sensing via bound states in the continuum laser

〇(M1)Chi-Wen Chen¹, Kuo-Ping Chen¹ (1.NYCU, TAIWAN)

Keywords:bound states in the continuum, metasurfaces

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.