Vector vortex beams achieve pure transverse energy flow in a 4π tight focus system
In optics,precise transverse energy flow modulation is critical for applications such as optical trapping and optical communications.Although the importance of transverse energy flow modulation techniques has been widely recognized,it is still challenging to achieve pure transverse energy flow modulation in a 4π tight focus system(4π-TFS).In this study,a method is proposed to generate pure transverse energy flow in 4π-TFS.The core of this method is the use of a vectorial vortex beam to achieve pure transverse energy flow by modulating its spatial parameters,such as polarization distribution and topological charge,which in turn leads to the interferential cancellation of longitudinal energy flow in the focal field.The results of this study not only provide an innovative technical way to realize the modulation of pure transverse energy flow,but also have important scientific significance and application prospects for promoting the development of the field of optical field modulation.
4π focusing systemtransverse energy flowlight field modulation
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