Electrowetting technology-based light fluid filter

Abstract

The invention discloses an electrowetting technology-based light fluid filter, which consists of a droplet drive unit and a Fabry-Perot filtering unit, wherein the droplet drive unit consists of control electrodes, a grounding electrode, a bottom glass plate, a top glass plate, a liquid layer and an insulating layer; hydrophobic layers are formed between the insulating layer and the top glass layer at intervals; the control electrodes are added with a drive voltage about 50V according to the motion state of droplets; surface tension drives the droplets to move to predetermined positions; contact angles between the droplets and the hydrophobic layers, and the surface tension on different sides are controlled by voltages of different control electrodes; the contact angle between a liquid and the surface of the insulating layer is changed along with the changes of an applied voltage V so as to obtain different filtering waveforms; the filtering waveforms is matched with the effect of a first-stage droplet filtering unit to achieve the effect of a two-stage filtering of a rough-fine filtering combination. The electrowetting technology-based light fluid filter improves tuning range and band width, and has the characteristics of good flexibility and controllability, rational design, simple and convenient operation and the like.

Description

technical field [0001] The invention relates to an optical fluid filter, in particular to an optical fluid filter based on electrowetting technology. Background technique [0002] In the field of existing technologies, tunable optical filters play an important role in the fields of modern optical communication systems, sensor networks, and biomedical imaging. It has good tunable filtering performance, but in the visible region, the size of the tunable resonant cavity will decrease with the decrease of the wavelength (w=200nm~300nm), due to the van der Waals in tiny devices at this size The force will seriously deform the resonant cavity and even adsorb each other. The traditional Fabry-Perot filter will be difficult to manufacture and work normally, and it will be impossible to change the state of the droplet and control the direction and speed of motion. Contents of the invention [0003] Aiming at the deficiencies of the prior art, the present invention provides an elec...

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Problems solved by technology

[0002] In the field of existing technologies, tunable optical filters play an important role in the fields of modern optical communication systems, sensor networks, and biomedical imaging. It has good tunable filtering performance, but in the visible region, the size of the tunable resonant cavity will decrease with the decrease of the wavelength (w=200nm~300nm), due to the van der Waals in tiny devices at this size The force will seriously deform the resonant cavity and even adsorb each other. The traditional Fabry-Perot filter will be difficult to manufacture and work normally, and it will be impossible to change the state of the droplet and control the direction and speed of the movement.

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