We report the diffraction properties at wavelengths of 632.8 and 1550 nm for volume transmission gratings made of a sequence of continuously aligned nematic liquid-crystal layers separated by isotropic polymer slices. The gratings are generated by holographically curing a solution of liquid crystal diluted in an isotropic prepolymer by means of a laser beam at a wavelength of 352 nm with a total intensity of approximately 10 mW/cm2. A diffraction efficiency of 98% was measured, and an electric field as low as 5 V/μm switches off the phase grating. Measured angular spectra are fitted by use of the modified coupled-mode theory including the effects of grating birefringence. © 2004 Optical Society of America.
Electro-optic properties of switchable gratings made of polymer and nematic liquid-crystal slices / D'Alessandro, Antonio; Asquini, Rita; C., Gizzi; R., Caputo; C., Umeton; A., Veltri; A. V., Sukhov. - In: OPTICS LETTERS. - ISSN 0146-9592. - ELETTRONICO. - 29:12(2004), pp. 1405-1407. [10.1364/ol.29.001405]
Electro-optic properties of switchable gratings made of polymer and nematic liquid-crystal slices
D'ALESSANDRO, Antonio;ASQUINI, Rita;
2004
Abstract
We report the diffraction properties at wavelengths of 632.8 and 1550 nm for volume transmission gratings made of a sequence of continuously aligned nematic liquid-crystal layers separated by isotropic polymer slices. The gratings are generated by holographically curing a solution of liquid crystal diluted in an isotropic prepolymer by means of a laser beam at a wavelength of 352 nm with a total intensity of approximately 10 mW/cm2. A diffraction efficiency of 98% was measured, and an electric field as low as 5 V/μm switches off the phase grating. Measured angular spectra are fitted by use of the modified coupled-mode theory including the effects of grating birefringence. © 2004 Optical Society of America.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
