Superimposed surface-relief diffraction grating holographic lenses on azo-polymer films

Investigation of the Surface Relief Grating formation on amorphous azobenzene polymer films

Effective grating theory for resonance domain surface-relief diffraction gratings.

An effective grating model, which generalizes effective-medium theory to the case of resonance domain surface-relief gratings, is presented. In addition to the zero order, it takes into account the first diffraction order, which obeys the Bragg condition. Modeling the surface-relief grating as an effective grating with two diffraction orders provides closed-form analytical relationships between...

Polarization of holographic grating diffraction. II. Experiment.

The transmittance, ellipsometric parameters, and depolarization of transmission, diffraction, and reflection of two volume holographic gratings (VHGs) are measured at a wavelength of 632.8 nm. The measured data are in good agreement with the theoretical simulated results, which demonstrated the correlation between the diffraction strength and the polarization properties of a VHG. Vector electro...

All-optical patterning of azo polymer films

Thin films of polymers containing non-linear optical chromophores based on azobenzene have been shown to respond mechanically to low power light interference, resulting in a transfer of an arbitrary optical pattern to surface relief in a single step, often well below the usual glass transition temperature. The timescale for this process is seconds to minutes, and the resulting surface relief pa...

Light induced conch-shaped relief in an azo-polymer film

We have discovered that a novel chiral structured surface relief (termed 'conch'-shaped surface relief) with a height of over 1 μm can be formed in an azo-polymer film merely by employing circularly polarized optical vortex irradiation with a total angular momentum of j = ±2. The temporal evolution of the conch-shaped surface relief in the azo-polymer film was also observed. The results provide...