Polarization gratings allow for real-time and artifact-free circular dichroism measurements

Pagliusi, P.; Lepera, E.; Provenzano, C.; Mazzulla, A.; Cipparrone, G.

doi:doi:10.1117/12.886969

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Polarization gratings allow for real-time and artifact-free circular dichroism measurements

Proc. SPIE 8069, 806910 (2011); http://dx.doi.org/10.1117/12.886969

Monday 18 April 2011

Prague, Czech Republic

Integrated Photonics: Materials, Devices, and Applications

Ali Serpengüzel, Giancarlo C. Righini, Alfred Leipertz

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Abstract

References (43)

P. Pagliusi and G. Cipparrone

Univ. of Calabria (Italy) and CNR-IPCF (Italy)

E. Lepera and C. Provenzano

Univ. of Calabria (Italy)

A. Mazzulla

CNR-IPCF (Italy)

We propose a simple and innovative diffractive method for circular dichroism (CD) spectroscopy. It enables real-time measurements and suppress the artifacts introduced by anisotropic specimens and nonideal optical elements in conventional CD spectrometers. The method is based on a single cycloidal optical axis grating and takes advantage of its peculiar optical diffraction behavior. We prove that the true CD spectrum of a general anisotropic medium could be measured in the spectral range of interest, exploiting unpolarized white light and the intrinsic spectral selectivity of the grating. Two experimental approaches have been pursued to create the cycloidal optical axis grating, both based on polarization holography and liquid crystal photoaligning technology. The gratings are replicas of the polarization holograms in thin-films of azodyes, either in low molar mass liquid crystal cells or in reactive mesogen layers.

History

Online May 31, 2011

Digital Object Identifier

http://dx.doi.org/10.1117/12.886969

Citation

P. Pagliusi, E. Lepera, C. Provenzano, A. Mazzulla and G. Cipparrone, "Polarization gratings allow for real-time and artifact-free circular dichroism measurements", Proc. SPIE 8069, 806910 (2011); http://dx.doi.org/10.1117/12.886969