Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Liquid-crystal-based switchable polarizers for sensor protection

Not Accessible

Your library or personal account may give you access

Abstract

Linear polarizers are generally employed in conjunction with advanced liquid-crystal filters for the protection of human eyes and optical sensors. For detection sensitivity under a no-threat condition to be maximized, the polarizer should remain in a clear state with a minimum insertion loss. When threats are present, it should be quickly switched to function as a linear polarizer with a high extinction ratio. Two types of switchable polarizer for sensor protection are demonstrated. The polarization conversion type exhibits a high optical efficiency in its clear state, a high extinction ratio in the linear polarizer state, and a fast switching speed, except that its field of view is limited to approximately ±10°. In contrast, an improved switchable dichroic polarizer functions effectively over a much wider field of view. However, its extinction ratio and optical efficiency in its clear state are lower than those of the polarization conversion type.

© 1995 Optical Society of America

Full Article  |  PDF Article
More Like This
Tuneable and switchable liquid crystal laser protection system

Ethan I. L. Jull and Helen F. Gleeson
Appl. Opt. 56(29) 8061-8066 (2017)

Polarizer-free, electrically switchable and optically rewritable displays based on dye-doped polymer-dispersed liquid crystals

Andy Ying-Guey Fuh, Che-Chang Chen, Cheng-Kai Liu, and Ko-Ting Cheng
Opt. Express 17(9) 7088-7094 (2009)

All-optical responsive azo-doped liquid crystal laser protection filter

Ethan I. L. Jull and Helen F. Gleeson
Opt. Express 26(26) 34179-34184 (2018)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (10)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (2)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved