Development of a new kind of switchable holographic grating made of liquid-crystal films separated by slices of polymeric material

Caputo, Roberto; Sio, Luciano De; Veltri, Alessandro; Umeton, Cesare; Sukhov, A. V.

doi:10.1364/ol.29.001261

Cited by 183 publications

(96 citation statements)

References 8 publications

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“…The assembled device is then filled by capillarity with a mixture of 70% of UV-curable pre-polymer NOA61 and 30% of E7 nematic LC (NLC). Then the standard POLICRYPS grating writing process [2] was performed on a stabilized setup [16]. The cell was then placed in a hot stage holder to carry out the optical writing at the temperature of about 63 °C above the nematic-isotropic transition phase of the NLC and pre-polymer which is about 61 °C.…”

Section: Sample Fabrication and Working Principlementioning

confidence: 99%

“…Among these novel composites made of polymer and liquid crystal (LC) such as H-PDLC (Holographic Polymer Dispersed Liquid Crystals) [1] and POLICRYPS (POlymer LIquid CRYstal Polymer Slices) [2] have been developed to make very efficient electro-optic Bragg gratings operating in a free-space configuration for fiber-optic systems [3] and display applications [4]. POLICRYPS have been also used as waveguides to make tunable microlaser sources [5].…”

Section: Introductionmentioning

confidence: 99%

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Tunable integrated optical filter made of a glass ion-exchanged waveguide and an electro-optic composite holographic grating

et al. 2008

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Abstract:We report the fabrication and the optical characterization of a hybrid tunable integrated optical filter. It consists of a diffused ionexchanged channel waveguide on a borosilicate glass substrate with a cover of the same glass to form a gap filled with a holographic grating. The grating morphology, called POLICRYPS (POlymer LIquid CRYstal Polymer Slices), is made of alternating stripes of polymer and liquid crystal acting as overlayer for the underneath waveguide. The filter structure includes aluminum coplanar electrodes to electrically control the grating properties, allowing the tunability of the filter. The electric driving power required to tune the filter obtained was in the range of submilliwatts due to the efficient liquid crystal electro-optic effect. A. d'Alessandro, R. Asquini, C. Gizzi, R. Caputo, A. Veltri, C. Umeton, and A. V. Sukhov, "Electro-optic properties of switchable gratings made of polymer and nematic liquid crystal slices," Opt. Lett. 29, 1405-1407 (2004 1005-1019 (1996). 14. T. A. Birks, P. St. J. Russell, and D. O. Culverhouse, "The acousto-optic effect in single-mode fiber tapers and couplers," J. Lightwave Technol. 14, 2519-2529 (1996). 15. J. Zou, F. Zhao, and R. T. Chen, "Two-step K+-Na+ and Ag+-Na+ ion-exchanged glass waveguides for Cband applications," Appl. Opt. 41, 7620-7626 (2002). 16. L. De Sio, R. Caputo, A. De Luca, A. Veltri, C. Umeton, and A. V. Sukhov, "In situ optical control and stabilization of the curing process of holographic gratings with a nematic film-polymer-slice sequence structure," Appl.

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Section: Sample Fabrication and Working Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tunable integrated optical filter made of a glass ion-exchanged waveguide and an electro-optic composite holographic grating

et al. 2008

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“…However, for simple switchable or little tuneable phased arrays, a single electrode may be employed. In this sense, various technologies have been proposed, double perpendicular rubbing [7], corrugation of the alignment layer [8], and polymer-doped LC [9]. A common trait of these technologies is that there is no definition of individual pixels.…”

Section: Introductionmentioning

confidence: 99%

Design and simulation of single-electrode liquid crystal phased arrays

Bellini

Geday

Bennis

et al. 2006

Opto-Electronics Review

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Liquid crystal (LC) phased arrays and gratings have been employed in optical switching and routing [1]. These diffractive optic elements are of great interest because they can be scaled up to a large number of elements and their optical properties can be electrically addressed with a low driving voltage. LC phase gratings have been achieved either by periodic addressing of pixels or by using periodically-modified structures. The latter approach leads to less reconfigurable devices but the addressing is simpler.In this paper we focus on optical phased arrays where the phase is varied either continuously or discretely and where the periodicity is induced by electrode configuration. We first describe a possible structure based on a conductive silicon wafer. We argue that this structure can induce either continuously or discretely varying arrays while applying single voltage to the array. In the second part we simulate the behaviour of such arrays. We base the simulation on a LC synthesized at the Military University of Technology, this high-birefringence nematic LC shows in a 4-μm thick cell a linear phase shift range of more than 360° between 1.2 V and 1.8 V. We calculate the distribution of the LC molecule director and assess the performance of the array with respect to the applied voltage. Finally, the relevance of such technology for switchable phased arrays is discussed.

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“…There are two main manufacturing procedures for recording these gratings, the holographic polymer-dispersed liquid crystal (H-PDLC) and its direct competitor Policryps/Polyphems gratings [10][11][12][13][14]. Some time ago, an H-PDLC Bragg grating recorded inside all the holes of a PCF was reported [15].…”

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confidence: 99%