Controllable three-dimensional helical energy backflow in an optical focusing field
Wenshuan Lu,
Jiakang Zhou,
Yuquan Zhang
et al.
Abstract:The energy of light generally moves forward along the light propagation direction. However, in recent years, a counter-intuitive effect has been discovered that energy backflow can occur in certain special light fields. Presently, controlling the energy backflow of light for application requirements is becoming a significant challenge. Here we propose a method to generate and control a three-dimensional helical energy backflow (HEB) optical field. By designing an exponential helical conical phase mask, the ene… Show more
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