Abstract
A novel configuration called negative axicon microsphere (NAMS) is proposed to generate ultralong light focusing. The key configurations of the engineered microsphere are investigated to optimize the figure-of-merit (FOM) of focusing beam. Through the fabricated NAMS with an original radius R of 11.5 μm, incident light at a wavelength λ of 405 nm can form a focused beam ∼52λ away from its flat exit surface with the beam length of 120.4λ. The ultralong focusing beam can be applied for remote laser nano-patterning etc with long depth-of-focus (DOF).
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