Deformation measurement of a micro-RF capacitive switch membrane using laser interferometry

Chenggen Quan; Shihua Wang; Cho Jui Tay; Ai Qun Liu; Huai Min Shang

doi:10.1117/1.1525795

1 January 2003 Deformation measurement of a micro-RF capacitive switch membrane using laser interferometry

Chenggen Quan, Shihua Wang, Cho Jui Tay, Ai Qun Liu, Huai Min Shang

Author Affiliations +

Optical Engineering, 42(1), (2003). https://doi.org/10.1117/1.1525795

Abstract

We have developed a measurement method to evaluate deformation of a metallic membrane (thickness 2 μm) in a micro-radio-frequency switch. The method is based on a modified Michelson interferometer incorporated with optoelectronic devices including a He-Ne laser, conventional optics, a CCD sensor, and a photodiode. To detect the deformation of the membrane in the rf switch, a He-Ne laser probe 10 µm in diameter is directed onto the specimen. The laser beam reflected off the membrane is combined with a reference beam. The combined laser beams are regulated to follow a common path. The resulting circular interference fringe pattern is simultaneously recorded by a CCD sensor and a photodiode. The deformation of the membrane is determined from the order of the resulting fringe pattern. As demonstrated by the experimental results, the proposed method is capable of measuring deformation of the rf switch at submicron levels.

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Chenggen Quan, Chenggen Quan, Shihua Wang, Shihua Wang, Cho Jui Tay, Cho Jui Tay, Ai Qun Liu, Ai Qun Liu, Huai Min Shang, Huai Min Shang, } "Deformation measurement of a micro-RF capacitive switch membrane using laser interferometry," Optical Engineering 42(1), (1 January 2003). https://doi.org/10.1117/1.1525795 . Submission:

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