Dr. Nina Kravets Profile

Dr. Nina Kravets

at LOMA

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 13 March 2024 Presentation

On-demand tunable liquid crystal vortex waveplates from field-induced topological defects

Nina Kravets, Etienne Brasselet

Proceedings Volume PC12907, PC129070N (2024) https://doi.org/10.1117/12.2692088

KEYWORDS: Wave plates, Liquid crystals, Coronagraphy, Electric fields, Magnetism, Beam shaping

Read Abstract +

It is known that in uniformly oriented liquid crystal cells subject to uniform external electric field, pairs of topological defects of unitary topological charge of opposite sign appear spontaneously as result of symmetry breaking. They attract each other and annihilate to release the elastic constraint associated with director distortion around defects. Several techniques have been reported to date in order to control the location of generation of individual topological defects and their isolation from surrounding defects to secure their stability and provide large working area around the defect core. Here we will present our recent progress in controlled generation of self-engineered topological defects in vertically aligned nematic cells using structured electric and magnetic fields. In particular, we will report on ways to control their characteristics (e.g., spatial extent, core size, topology) in the context of developing advanced tunable liquid crystal diffractive waveplates for beam shaping and high-contrast imaging applications.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years