Perovskite-based Lossy-mode resonance sensor in visible light spectrum: Comparison and optimization of optical enhancements

This work considered a two-dimensional hybrid organic-inorganic perovskite thin film with various thicknesses within a sandwiched structure of P3HT: PC61BM and PEDOT: PSS (the top and bottom sides). The optical absorption based on the method of attenuated total reflection was calculated. Then, a detailed primeval study on the lossy mode resonance (LMR) behavior of perovskite thin film as a refractive index sensor was theoretically investigated by defining surrounding media with various refractive indices ranging from 1.33 to 1.44. Since one of the efficient ways to improve the performance of the LMR sensor is optimizing the thickness of the lossy layer, herein, both polarization absorption spectra were studied. The results revealed that the transverse magnetic (TM) mode experienced more loss variation with exhibiting higher red-shift versus rather than transverse electric (TE) mode. The highest sensitivity of 3400 refractive index unit (RIU-1) was achieved; with such high sensitivity to the surrounding environment variations, the proposed structure indicates a versatile prospect. We believe that the perovskite-based LMR sensor can play an influential role in signal detection in biochemical sensors.