Sensing based on Bloch surface wave and self-referenced guided mode resonances employing a one-dimensional photonic crystal

Sensing abilities of a one-dimensional photonic crystal (1DPhC) represented by multilayer dielectric structure are analyzed theoretically and experimentally, using new wavelength interrogation interference method. The comprising glass substrate six bilayers TiO 2 /SiO with termination layer is employed in both gas sensing based on the Bloch surface wave (BSW) resonance liquid analyte self-referenced guide-mode (GMR). We model spectral reflectance responses Kretschmann configuration coupling prism made BK7 show that sharp dip maximum depth associated BSW excitation red-shifted as refractive index (RI) changes range 1–1.005. Thus, sensitivity 1456 nm per RI unit (RIU) figure merit (FOM) 91 RIU ?1 reached. Similarly, we for aqueous solutions ethanol to dips GMRs, highest FOM reached 751 nm/RIU 25 , respectively. Moreover, one smallest shift changes, hence it can be used reference. theoretical results confirmed experimental ones when humid air 0.027 nm/%relative humidity (RH) 1.4×10 ?3 %RH . GMR ethanol, 682 23 reference also resolved this self-reference makes measurement more accurate repeatable, less sensitive optomechanical drifts.