Tunable longitudinal polarized light pin array with super-resolution and high-aspect ratio

Abstract

The invention provides a tunable longitudinal polarized light pin array with super-resolution and high-aspect ratio. The array comprises a device body composed of a femtosecond laser, a beam expander,a spatial light modulator device, a polarization converter device, a high numerical aperture objective lens and a focal plane detector. The array is characterized by comprising the following steps: light waves emitted by the femtosecond laser become parallel lights after passing through a beam expanding system composed of two lenses and an aperture stop; the parallel lights pass through a ternarymixing filter and a multi-tap multiplexing filter which are encoded by the spatial light modulator; changing a linearly polarized light into a radial polarized light by adjusting a polarization voltage after being reflected and passing through the polarization converter device; and performing depolarizing on the polarization of an incident light field by the high numerical aperture objective lens, thereby redistributing the longitudinal polarization and the transverse polarization to obtain the longitudinal polarized light pin array with super-resolution at a focus area of the focal plane detector.

Description

technical field [0001] The invention relates to a tunable super-resolution longitudinally polarized light needle array with high aspect ratio. Background technique [0002] With the advent of the era of big data, the recording and storage of information has become an indispensable link in people's social activities. Digital information storage technology can access a large amount of data information, effectively alleviating the pressure caused by the rapid expansion of information volume. However, there is a huge gap between the currently available storage capacity and the amount of data information generated, which seriously hinders economic development and social progress. Therefore, the development of high-density, large-capacity, high-speed, small-volume and low-cost Advanced storage technology is urgent. Optical storage technology uses laser to irradiate the medium, and the laser interacts with the storage medium to cause the properties of the medium to change and store...

AI Technical Summary

Problems solved by technology

However, the existing longitudinally polarized light needles used in optical storage and optical processing have disadvantages such as low density, low efficiency, and slow speed.

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