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Beamsplitters Enhanced Information Security And Capacity
May 18, 2017

Recently, the sub-wave optical group of the Institute of Optoelectronic Technology, Chinese Academy of Sciences proposed a new type of vortex light beam splitting method: through the sub-wavelength scale on the phase and amplitude of light waves at the same time to achieve high efficiency, high uniformity of the multi-channel Beamsplitters. Related results published in the German Wiley magazine hosted the "advanced materials technology"

The vortex beam has important applications in optical micromanipulation, three-dimensional optical imaging and optical communication because of its helical phase wavefront and near-infinite topological load. Compared with the single-channel vortex beam generator, the multi-channel vortex beam generator can not only enhance the information security and capacity in the information transmission and storage, capture a large number of particles in the particle capture at once, but also can detect different objects at the same time Of the topography or movement characteristics. Conventional multi-channel vortex beam generating devices, such as helical gratings, spatial light modulators (SLMs), etc., have high order diffraction interference, energy dissipation of different channels, and excessive component size And can not be integrated in the micro-nano chip and other issues, so that these devices in the application there is a great limitation. Therefore, the micro-multi-channel vortex light Beamsplitters with high homogeneity and no high order diffraction has important significance in the field of applied optics. The following are the same as the "

The State Key Laboratory of Microfabrication and Optics of Optoelectronics uses a subwavelength structure to realize a multi-channel vortex beam generator with uniform distribution of light energy between channels and no high order diffraction. By adjusting the amplitude and phase of the light wave into the size and rotation angle of the cell structure, the amplitude and phase control of the beam are realized at the same time. The element thickness is about one tenth of the incident wavelength, the resulting vortex beam is not subject to high order diffraction interference, and the light energy distribution between the channels is uniform. The experimental results show that the energy uniformity of the beam lattice is 0.146 for the second - order amplitude and continuous phase - controlled multi - channel generator, which is better than pure phase regulation. Based on this principle developed a series of arrayed laser Beamsplitters in the CLP Group, Chinese Academy of Sciences, Aerospace Science and Technology Group, a number of tasks have been applied.





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