The principle and application of micro lens array

1. Principle of Micro Lens Array

A Micro Lens Array is a two-dimensional array composed of many tiny lenses. Each micro lens can focus the incident light onto a small area, and by controlling the focal length and position of each micro lens, control and adjustment of the light can be achieved.

The principle of a micro lens array utilizes the lens's defocusing effect. By changing the incident angle and focal length of the light, the focal point and magnification of the light can be adjusted. Micro lens arrays are typically manufactured on optical materials using photolithography techniques, with common materials including silicon, glass, and plastic.

The working principle of a micro lens array can be divided into two steps: first, the incident light passes through the micro lens array and is focused onto different focal points; Then, by receiving and processing light at different focal points, control and adjustment of the light can be achieved.

2. Application of Micro Lens Arrays

Micro lens arrays have a wide range of application fields, and the following are some common application scenarios:

2.1 Optical microscope

Micro lens arrays can be used for focusing and focusing functions in optical microscope systems. By adjusting the position and focal length of the micro lens, the focus plane can be adjusted, thereby achieving clear imaging of the observed sample. At the same time, the micro lens array can also expand the focusing range and enhance the depth perception function.

2.2 Optical Sensors

Micro lens arrays can be used for optical signal focusing and enhancement in optical sensor systems. By placing a micro lens array above the photosensitive element, the receiving efficiency and signal-to-noise ratio of optical signals can be effectively improved. The micro lens array can also adjust and optimize the optical signal by adjusting the focal length and position of the micro lenses.

2.3 Optical Communication

Micro lens arrays can be used for beam shaping and focusing functions in optical communication systems. By adjusting the focal length and position of the micro lens array, focusing and orientation of the optical signal can be achieved. Micro lens arrays can also achieve beam shaping and splitting of optical signals by adjusting the spacing and layout of lenses.

2.4 Optical Display

Micro lens arrays can be used for pixel control and magnification functions in optical display systems. By placing a micro lens array above the display panel, focusing on pixels and enhancing light intensity can be achieved. Micro lens arrays can improve the resolution and brightness of display screens, enhance image clarity and detail.

3. Conclusion

Micro lens array is an important optical device that utilizes the defocusing effect of lenses to control and adjust light rays. Micro lens arrays have a wide range of applications in fields such as optical microscopes, optical sensors, optical communications, optical displays, and biomedical imaging. With the continuous development of technology, the application prospects of micro lens arrays will become even broader.