Thermomechanical MEMS membranes for fiber optic temperature sensing

Authors : ONUR FERHANOĞLU

Pages : 2491-2500

View : 15 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :In this study, the design, fabrication, and characterization results of square and circular cross-sectioned, bimaterial microelectromechanical system insert ignore into journalissuearticles values(MEMS); membranes are presented. The MEMS structures, having width of 250 $\mu $m to 1.5 mm and 1-4 mm$^{2}$ die area, were designed towards integration on a single-mode fiber tip for temperature-sensing. Embedded diffraction grating underneath each membrane allows for interferometric detection of thermomechanical response through backside laser illumination. The displacement of MEMS membranes was monitored under direct heating, revealing 50--1800 nm/$^{\circ}$C thermomechanical sensitivity range. Furthermore, atomic force microscopy-based stiffness measurement on the MEMS membranes revealed a spring constant within 2--30 N/m range. Temperature measurement range and speed of the MEMS sensors were thoroughly tabulated based on experimental findings, as well as finite-element simulations and analytical calculations. Finally, proof-of-concept testing of a selected device was accomplished through air-coupling of the MEMS structure with a gradient index-collimated fiber, revealing $
Keywords : Microelectromechanical systems, temperature measurement, microfabrication