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

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

doi:10.1117/12.886969

31 May 2011 Polarization gratings allow for real-time and artifact-free circular dichroism measurements

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

Proceedings Volume 8069, Integrated Photonics: Materials, Devices, and Applications; 806910 (2011) https://doi.org/10.1117/12.886969
Event: SPIE Microtechnologies, 2011, Prague, Czech Republic

Abstract

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.

Citation Download 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, Integrated Photonics: Materials, Devices, and Applications, 806910 (31 May 2011); https://doi.org/10.1117/12.886969

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available