A kind of miniature bridge structure and its preparation method

Abstract

The invention provides a miniature bridge-type structure and a preparation method thereof. The miniature bridge-type structure comprises four cantilever beams, a metal bridge floor, four metal piers and a substrate. Each cantilever beam is of an L-shaped structure, one ends of the cantilever beams are fixedly connected with the metal piers in a perpendicular mode, and the other ends of the cantilever beams are connected with the metal bridge floor; the metal bridge floor and the cantilever beams are located in the same plane, the metal bridge floor is hung on the substrate through the four cantilever beams, and a cavity structure is formed between the lower bottom face of the metal bridge floor and the substrate. The method induces the steps of preparing the metal piers on the clean substrate surface, coating the substrate surface where the metal piers are formed with a sacrificial layer, carrying out photoetching treatment on the sacrificial layer, then removing the portions, on the tops of the metal piers, of the sacrificial layer to expose the tops of the metal piers, carrying out solidified treatment on the sacrificial layer, preparing the metal bridge floor on the solidified sacrificial layer, removing the portion, at the bottom of the metal bridge floor, of the sacrificial layer to form a cavity, and building the bridge-type structure. The miniature bridge-type structure is large in tuning range and good in bridge floor parallelism.

Description

technical field [0001] The invention belongs to the technical field of micro-electro-mechanical systems, and more specifically relates to a miniature bridge structure and a preparation method thereof. Background technique [0002] In microelectromechanical systems (MicroElectroMechanicalSystems, MEMS), the micro tunable F-P cavity filter is a passband tunable optical filter device with small size, light weight, low insertion loss, fast response, wide tuning range, fineness With high advantages, it is widely used in space-borne and airborne infrared imaging spectral analysis and filtering, and has important applications in military and civilian applications. At present, it is widely valued by research institutions at home and abroad. At the same time, in the field of optical communication, the micro F-P cavity tunable filter can be used as demultiplexing and signal demodulation of dense wavelength division multiplexing (DenseWavelenthDivisionMultiplexing, DWDM); in the field ...

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Problems solved by technology

[0007] Aiming at the defects of the prior art, the present invention provides a miniature bridge structure, which aims to solve the problems of the small adjustable range of the miniature F-P cavity and the poor parallelism of the F-P cavity in the prior art

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