Variable-focal-length bifocal microlens and use method thereof

Abstract

The invention discloses a variable-focal-length bifocal microlens and a use method thereof. The variable-focal-length bifocal microlens comprises a cylindrical microcavity and three kinds of insulating liquid which are immiscible, identical in density and different in refractive index. The cylindrical microcavity is formed by jointly combining an upper cover plate, a cylindrical tube, a planar electrode and a glass substrate which are sequentially arranged from top to bottom; the three kinds of liquid are stored in the cylindrical microcavity, the three kinds of insulating liquid are sequentially marked as first liquid, second liquid and third liquid according to the order of refractive indexes from small to large, and the third liquid is attached to the glass substrate subjected to surface treatment in a liquid drop shape; the second liquid integrally wraps the third liquid in the shape of the spherical crown, the center of the second liquid coincides with the center of the third liquid, and the cylindrical microcavity and the peripheral space of the second liquid are filled with the first liquid. According to the variable-focal-length bifocal microlens, the manufacturing method is simple, the cost is low, and the finished product has good surface smoothness and can fully meet the use requirements of many fields.

Description

technical field [0001] The invention relates to a microlens device, in particular to a bifocal microlens with variable focal length based on the dielectrophoretic effect and its corresponding use method, involving photoelectric information integration devices, microfluidic optical analysis, laser processing and medical treatment technology and other fields. Background technique [0002] As an important optical component, microlens has the characteristics of small size, light weight and high integration. It is widely used in optical sensing technology, optical waveguide, optical fiber coupling, artificial compound eye structure, micro-manufacturing, biochemical system and chip experiment. room system. [0003] With the development of the semiconductor industry and the improvement of lithography and microfabrication technology, various types of microlenses with special structures have played an important role in many applications, such as: Fresnel microlenses rely on their al...

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Problems solved by technology

However, combined with the above scheme, it can be clearly seen that although the above scheme has certain effects, the focal length of the bifocal microlens prepared by the above method is fixed and cannot be adjusted, which limits its further application.

[0005] In summary, if a bifocal microlens with var

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