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Applied Physics Letters / Volume 97 / Issue 9 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 97, 093302 (2010); http://dx.doi.org/10.1063/1.3483157 (3 pages)

All-optical intensity modulation of near infrared light in a liquid crystal channel waveguide

Antonio d’Alessandro1,2, Rita Asquini1, Marco Trotta1, Giovanni Gilardi1,2, Romeo Beccherelli2, and Iam Choon Khoo3

1Dipartimento di Ingegneria dell’Informazione, Elettronica e Telecomunicazioni, Sapienza Università di Roma, Via Eudossiana 18, 00184 Rome, Italy
2Consiglio Nazionale delle Ricerche-Istituto per la Microelettronica e Microsistemi (CNR-IMM), 00133 Rome, Italy
3Department of Electrical Engineering, Penn State University, Pennsylvania 16802, USA

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(Received 12 July 2010; accepted 30 July 2010; published online 1 September 2010)

We demonstrate a nonlinear optical channel waveguide made of E7 nematic liquid crystal infiltrated in a silica on silicon groove. Near infrared light at the wavelength of 1560 nm fiber coupled to the core of the liquid crystal waveguide was optically modulated by an optical beam with power below 25 mW by exploiting the optical Freedericks transition. By modeling the optical molecular reorientation in the nematic liquid crystal confined in a waveguiding geometry we are able to reproduce the experimental results.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

infrared spectra, intensity modulation, nematic liquid crystals, optical modulation, optical waveguides

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3483157

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (click on thumbnails to view enlargements)

FIG.1
Schematic of the LCW with tilt (θ) and twist angle (ϕ) of the NLC director (inset).

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
Light intensity vs voltage for 1 mW input power.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
LCW output vs input optical power at different bias voltages.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
Calculated tilt distribution with input optical power of 25 mW at 1560 nm and a bias of 2.17 V. The video shows the tilt evolution as the optical power increases from 0 to 25 mW (enhanced online). [URL: http://dx.doi.org/10.1063/1.3483157.1 ]

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.5
Calculated LCW optical output vs input power at different bias voltages.

FIG.5 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

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