Articolo in rivista, 2022, ENG, 10.1109/LPT.2022.3161715

Opto-Thermally Tunable Axicon-Like Device Based on PDMS-Au Bilayers

Margheri G.

Institute for Complex Systems-CNR, Sesto Fiorentino, Florence, 50019, Italy

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 mu textm 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/mm2 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.

IEEE photonics technology letters 34 , pp. 395–398

Keywords

Laser beams, Measurement by laser beam, Optical pumping, Gold, Optical beams, Optical variables measurement, Optical imaging

CNR authors

Margheri Giancarlo

CNR institutes

ISC – Istituto dei sistemi complessi