Integrated Optics Devices Based on Liquid Crystals

Beccherelli, Romeo; Bellini, Bob; Donisi, Domenico; d’Alessandro, Antonio

doi:10.1080/15421400701206089

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…2 shows the atomic force microscopy of a typical SiO 2 /Si groove obtained by using standard micromachined processes on silicon with thermally grown silica, acting as low refractive index lower cladding. 68 The typical triangular shape of the groove is given by the preferential etching direction in [100] silicon substrate. The main advantage in using such a structure is related to the smoothness of the surfaces.…”

Section: Liquid-crystal Core Waveguidesmentioning

confidence: 99%

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Guided-wave liquid-crystal photonics

Zografopoulos¹,

Asquini²,

Kriezis³

et al. 2012

Lab Chip

111

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In this paper we review the state of the art in the field of liquid-crystal tunable guided-wave photonic devices, a unique type of fill-once, molecular-level actuated, optofluidic systems. These have recently attracted significant research interest as potential candidates for low-cost, highly functional photonic elements. We cover a full range of structures, which span from micromachined liquid-crystal on silicon devices to periodic structures and liquid-crystal infiltrated photonic crystal fibers, with focus on key-applications for photonics. Various approaches on the control of the LC molecular orientation are assessed, including electro-, thermo- and all-optical switching. Special attention is paid to practical issues regarding liquid-crystal infiltration, molecular alignment and actuation, low-power operation, as well as their integrability in chip-scale or fiber-based devices.

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Section: Liquid-crystal Core Waveguidesmentioning

confidence: 99%

“…2 Atomic force microscope image of a silicon V-groove. 68 Reprinted by permission of Taylor & Francis Ltd. Fig.…”

Section: Liquid-crystal Core Waveguidesmentioning

confidence: 99%

Guided-wave liquid-crystal photonics

Zografopoulos¹,

Asquini²,

Kriezis³

et al. 2012

Lab Chip

111

View full text Add to dashboard Cite

show abstract

“…The LC optical switching can be also arranged by changing the boundary refractive index for the fiber using LC cell [6,7]. Another LC optical switches can be used utilizing the principle of Mach Zehnder interferometer with a switchable ferroelectric LC cladding [8] or Fabry-Perot LC infiltration cell integrated in high index contrast silicon-on-insulator waveguide [9].…”

Section: Lc Switchesmentioning

confidence: 99%

Liquid crystal applications in photonics

Chigrinov

2009

SPIE Proceedings

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Liquid crystal (LC) devices for Photonics applications is a hot topic of research. Such elements begin to appear in Photonics market. Passive elements for fiber optical communication systems (DWDM components) based on LC cells can successfully compete with the other elements used for the purpose, such as micro electromechanical (MEM), thermo-optical, opto-mechanical or acousto-optical devices.We have already successfully fabricated certain prototypes of the optical switches based on various electrooptic modes in ferroelectric and nematic LC materials. The electrooptical modes used for the purpose included the light polarization rotation, voltage controllable diffraction and fast switching of the LC refractive index. Use of photo-alignment technique pioneered by us makes it possible to develop new LC fiber components. Almost all the criteria of perfect LC alignment are met in case of azo-dye layers. We have already used azo-dye materials to align LC in superthin photonic holes, curved and 3D surfaces and as cladding layers in microring silicon based resonators. We have already used the photoaligning materials to align LC mixtures in small cavities, such as the holes and tubes of photonic crystals, having size of 1 μm and less and obtained excellent LC orientation inside the tubes by photoalignment.The prototypes of new LC efficient Photonics devices, such as optically rewritable LC waveguides and voltage controllable diffraction gratings are envisaged. The polarization controllers, polarization rotators, variable optical attenuators and other passive LC optical elements for fiber communication networks are under way.

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“…Due to their unique aspect of providing controllable birefringence, liquid crystal components are proposed as switches, couplers, and filters in various applications. [15][16][17][18] This study focuses on the analysis and design of liquid crystal-based DLSPP (LC-DLSPP) elements, and the implementation of an electrically tunable LC-DLSPP optical switch for the 1.55 lm telecom window. The proposed LC-DLSPP waveguide consists of a thin Au film loaded by PMMA.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystal-based dielectric loaded surface plasmon polariton optical switches

Tasolamprou

Zografopoulos

Kriezis

2011

Journal of Applied Physics

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An optical switch based on liquid crystal dielectric loaded surface plasmon polariton waveguides is proposed and theoretically analyzed. The infiltration of the plasmonic structure with a nematic liquid crystalline material serving as the dielectric loading is shown to allow for extensive electrical tuning of its waveguiding characteristics. Both the electrical switching and optical properties of the proposed waveguide are investigated in the context of designing a directional coupler optical switch, which is found to combine efficient voltage control, low power consumption, high extinction ratio, and relatively low insertion losses.

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Integrated Optics Devices Based on Liquid Crystals

Cited by 7 publications

References 23 publications

Guided-wave liquid-crystal photonics

Guided-wave liquid-crystal photonics

Liquid crystal applications in photonics

Liquid crystal-based dielectric loaded surface plasmon polariton optical switches

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