Abstract
Using a binary microlens of diameter 14 μm and focal length 532 nm () in resist, we focus a 633 nm laser beam into a near-circular focal spot with dimensions and ( is incident wavelength) at full width half-maximum intensity. The area of the focal spot is . The incident light is a mixture of linearly and radially polarized beams generated by reflecting a linearly polarized Gaussian beam at a four-sector subwavelength diffractive optical microelement with a gold coating. The focusing of a linearly polarized laser beam (the other conditions being the same) is found to produce an elliptical focal spot measuring and . To our knowledge, this is the first implementation of subwavelength focusing of light using a pair of micro-optic elements (a binary microlens and a micropolarizer).
© 2015 Optical Society of America
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