Vygantas Mizeikis

4.1 Retardance and its Azimuth δ , θ $\delta,\theta$ from Fit of 4-pol. Images Measurement of orientational properties of an absorbing sample requires only one linear polarizer for the incoming light onto the sample or at the detector. With a 4-pol.

The 3D laser printing of form birefringent structures promises fast prototyping of polarization-sensitive photonic elements. However, achieving the quarter- and half-wave phase retardation levels needed in applications still remains a challenge, especially at visible wavelengths. Thickness of the birefringent region, usually consisting of simple 1D gratings, must be sufficiently large to ensure the required retardance, making the 3D laser-printed gratings prone to mechanical collapse.

Abstract In this Letter, we report on design and realization of solvent-sensitive microstructures based on three-dimensional periodic lattices fabricated in a polymeric photoresist. Sensing is based on reversible size change in polymeric microstructures upon immersion in wetting and non-wetting solvents. Its readout is achieved purely optically by observing modification of a Moiré pattern formed by grating-like deformable and rigid polymeric structures.