Abstract

A simple method to build up a reflective axicon-like structure is proposed based on the localized swelling of a PDMS-gold bilayer heated by a tightly focused pump laser source. When the distorted reflective surface is illuminated by a probe beam, the theoretical modeling and the experimental tests put in evidence the formation of virtual foci with tens <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> diameter with a depth of focus to 103 mm. Other than being tunable in a flexible and simple way, the reflecting device is wavelength independent and completely reconfigurable with up to 207.3 W/mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> pump power densities. As the width of the apical region is triggered by the dimension of the pump focal spot, the device is taylorable for miniaturized systems.

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