Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Optical memory with TNLC devices (1982)

José Antonio Martín Pereda, Miguel A. Muriel

Published Sep 1, 1982• 0 citations
OpenAlex

Abstract

In this paper we describe a twisted nematic liquid crystal (TNLC) device structure with optical feedback capable of bistable operation and optical memory. Its structure is the conventional one as employed in hybrid optical bistability.

Related papers

Optical memory with twisted nematic liquid crystal (TNLC) devices

José Antonio Martín Pereda, Miguel A. Muriel

A design for obtaining memory in optical bistability with liquid crystals is reported. This design uses optical feedback on a twisted nematie liquid crystal ( TNLC ) through an optoelectronic system. A constant input light is the read-out and its value depends on the desired initial working point, usually at the bottom of the T(V) vs. V curve. Light levels depend on the feedback. An input light pulse change the working point to the top of the transmission curve. When this pulse vanishes, the working point remains at the upper part of the curve. Hence a memory function is obtained. Minimum pulse width needed was 1msec. ON-OPF ratio was 100:3.

•Jan 1, 1983•4 citations

All optical bistability device with counterclockwise hysteresis using twisted nematic liquid crystals on metal–insulator–metal structure

ﾃｨｴﾝ ﾀｲﾝ ﾌｧﾝ, Pham Tienthanh, 賢 山本 +5 more

•Aug 1, 2014•0 citations

Optical Bistability of a Nematic Liquid Crystal with Photorefractively Amplified Feedback

M. Ingold, K. Totland, Gilles Pauliat +2 more

Light induced changes of the refractive index in a nematic liquid crystal [1] and in a photorefractive crystal (KNbO3) [2] have been used to design an optically bistable device [3]. In the nematic liquid crystal (NLC) light can reorient biréfringent molecules. Therefore the NLC, placed between crossed polarizers, acts as an optically controlled gate. In the KNbO3 crystal photorefractive two-beam coupling is used for light amplification.

Photorefractive Effects, Materials, and Devices•Jan 1, 1990•0 citations

Optical bistability using nematic liquid crystals and polymer-dispersed liquid crystals

Doina Mănăilă-Maximean, Constantin Roşu, Rodica Bena +2 more

We present the experimental results concerning hybrid optical bistable devices without resonant cavity using as electro-optic modulators a nematic liquid crystal cell and a polymer dispersed liquid crystal film. Bistable operation was studied for different control voltages and multistable behavior was studied for the polymer dispersed liquid crystal film as a function of the control voltage frequency.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jul 2, 1998•1 citation

Twisted Nematic Liquid Crystal 에서 나타나는 광쌍안정현상과 광다중안정상태의 관찰 ( Optical Bistability and Multistability in the Twisted Nematic Liquid Crystal )

황월연, 송석호, 공홍진

대한전자공학회 학술대회•Jan 1, 1987•0 citations

Optical bistability of a nematic liquid crystal with photorefractively amplified feedback

M. Ingold, J. Keller, Gilles Pauliat +1 more

Optical bistability has been observed in a new configuration consisting of a nematic liquid crystal (ROTN 403) and a photorefractive crystal (KNbO3). The nematic liquid crystal (NLC), placed between crossed polarizers, serves as an optically controlled gate. The transmitted signal beam is amplified by photorefractive two-wave mixing and sent back onto the NLC in such a way that it changes the transmission of the gate. Bistability of the optical signal in the feedback loop with a large hysteresis is found. The bistable hysteresis curve depends on the nonlinearities of the NLC and of the photorefractive crystal, on the intensity of the storage beam and on the losses in the feedback loop.

Ferroelectrics•Apr 1, 1989•5 citations
A design for obtaining memory in optical bistability with liquid crystals is reported. This design uses optical feedback on a twisted nematie liquid crystal ( TNLC ) through an optoelectronic system. A constant input light is the read-out and its value depends on the desired initial working point, usually at the bottom of the T(V) vs. V curve. Light levels depend on the feedback. An input light pulse change the working point to the top of the transmission curve. When this pulse vanishes, the working point remains at the upper part of the curve. Hence a memory function is obtained. Minimum pulse width needed was 1msec. ON-OPF ratio was 100:3.
Optical bistability has been observed in a new configuration consisting of a nematic liquid crystal (ROTN 403) and a photorefractive crystal (KNbO3). The nematic liquid crystal (NLC), placed between crossed polarizers, serves as an optically controlled gate. The transmitted signal beam is amplified by photorefractive two-wave mixing and sent back onto the NLC in such a way that it changes the transmission of the gate. Bistability of the optical signal in the feedback loop with a large hysteresis is found. The bistable hysteresis curve depends on the nonlinearities of the NLC and of the photorefractive crystal, on the intensity of the storage beam and on the losses in the feedback loop.