Antenna‐Inspired Bionic Lithium Niobate Tuning Fork for Multi‐Component Light‐Induced Thermoelastic Spectroscopy Sensing

ABSTRACT Inspired by the rich tactile sensors on ant antennae that facilitate sensitive environmental perception, this paper presents a bionic lithium niobate tuning fork (B‐LiNTF) for multi‐component light‐induced thermoelastic spectroscopy (LITES) sensing. The device employs three vibration modes of the first‐order in‐plane vibration mode, the second‐order in‐plane vibration mode, and the first‐order out‐of‐plane vibration mode in B‐LiNTF to detect acetylene (C 2 H 2 ), methane (CH 4 ), and water vapor (H 2 O) with high sensitivity. The minimum detection limits (MDLs) of the three gases were measured to be 24.9 ppb, 1.5 ppm and 8.1 ppm, respectively. This work demonstrates the effectiveness of B‐LiNTF for multi‐component gas sensing.