High-sensitivity lossy mode resonance sensor by deposition of perovskite nanofilms on the eccentric core quasi D-shaped photonic quasi-crystal fiber

Abstract

Lossy mode resonance (LMR) sensors have garnered widespread attention in recent years. This work proposes a quasi-D-shaped eccentric core photonic quasi-crystal fiber LMR (PQF-LMR) sensor with an M-type perovskite coating surface. The sensor is based on a ten-fold Penrose PQF structure, featuring four kinds of air holes and perovskite coating deposited on the micro-groove surface. The sensing characteristics are analyzed using the finite element method. The results indicate that multiple LMRs can be excited in both Y-polarization and X-polarization. The 2 nd and 3 rd lossy modes exhibit outstanding performance in terms of sensitivity and figure of merit (FOM). The 2 nd lossy mode achieves a maximum sensitivity of 84,985 nm/RIU and an average sensitivity of 46,358 nm/RIU. In the 3 rd lossy mode, the maximum FOM reaches 904.34 RIU−1. For comparison, the quasi-D-shaped PQF-LMR sensor with a flat surface is also investigated. The PQF-LMR sensor with perovskite coating demonstrates superior sensing performance and significantly broadens the prospects for LMR sensors in various fields.