The invention relates to a preparation method of a spatially staggered mixed material film and an application thereof in an achromatic
superlens. The method comprises the following steps that firstly, a multi-sector spatial deposition
mask is processed by using a thin
silicon wafer, partitioned covering is carried out by using the multi-sector
mask, and a first
dielectric material film is deposited on a super lens substrate; after the
mask and redundant materials are removed through an
etching technology, another multi-sector mask is replaced, and a second
dielectric material film with the same thickness is deposited on the remaining sectors; and finally, a nano structure of the
superlens is processed through micro-nano technologies such as
electron beam
lithography and the like. The invention provides a new thought for preparing the high-efficiency dual-
wavelength achromatic
superlens and applying the high-efficiency dual-
wavelength achromatic superlens to two-
photon microscopic imaging and two-
photon STED super-resolution micro
endoscopic imaging, the superlens realizes high-efficiency
confocal of
infrared band exciting light and
visible band fluorescent light or loss light, therefore, the method is expected to be used in super-resolution micro
endoscopic imaging of deep biological tissues of living bodies, and dynamic real-time super-resolution imaging with low invasion damage and
high resolution is further realized.