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Journal Article

Sharper focus for a radially polarized light beam

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Citation

Dorn, R., Quabis, S., & Leuchs, G. (2003). Sharper focus for a radially polarized light beam. PHYSICAL REVIEW LETTERS, 91(23): 233901. doi:10.1103/PhysRevLett.91.233901.


Cite as: https://hdl.handle.net/21.11116/0000-0001-BB28-0
Abstract
We experimentally demonstrate for the first time that a radially polarized field can be focused to a spot size significantly smaller [0.16(1)lambda(2)] than for linear polarization (0.26lambda(2)). The effect of the vector properties of light is shown by a comparison of the focal intensity distribution for radially and azimuthally polarized input fields. For strong focusing, a radially polarized field leads to a longitudinal electric field component at the focus which is sharp and centered at the optical axis. The relative contribution of this component is enhanced by using an annular aperture.