Research on depth-of-field depth-of-light field microscopy in the terahertz band

Light field microscopic imaging technology is achieved by inserting a micro-lens array capable of capturing light field information on the relay image plane of a conventional optical microscope. The multi-focus surface can be extracted by the refocusing technique to increase the geometric depth of field. The terahertz wave has many advantages, such as strong penetrating power, low photon energy , good coherence and so on. Therefore, It can be used for microscopic imaging to obtain more comprehensive information, and can also improve the depth of field and resolution of imaging, and is also suitable for the detection of living organisms. Based on the principle of light field microscopic imaging and terahertz microscopic imaging technology, this paper analyzed the depth of field is related to the wavelength of the light source and the size of the micro-lens array. It has been found that the depth of terahertz light field microscopy technology can be increased by at least one to two orders of magnitude when the wavelength range is extended to the terahertz band.