Small singularity size is critical for achieving low light loss and high contrast for vector vortex waveplate (VVW) based coronagraph. In the opto-mechanical system for recording VVW with photoalignment, reshaping the center light intensity distribution and precision alignment can effectively decrease singularity size. We have developed methods for redistributing the light intensity near the singularity. A new direct alignment method is introduced. This method helps in reaching the optimized alignment position by allowing to depict the beam profile at the photoalignment surface. Employing these techniques and new liquid crystal polymer materials, we have fabricated VVWs with sub-micrometer defect size for UV, and subs-wavelength defect size for 1.5 micrometer wavelength range. Inversely twisted layers method was used for fabrication of broadband VVW for the near infrared region.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Liquid crystal polymer vector vortex waveplates with sub-micrometer singularity


    Contributors:


    Publication date :

    2015-03-01


    Size :

    1701631 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    High efficiency broadband liquid crystal polymer vector vortex waveplates

    Tabirian, Nelson / Xianyu, Haiqing / Serabyn, Eugene | IEEE | 2017


    Fabricating vector vortex waveplates for coronagraphy

    Tabiryan, N. V. / Nersisyan, S. R. / Xianyu, H. et al. | IEEE | 2012


    Opportunities for next generation vector vortex waveplates

    Roberts, David E. / Gerosa, Katherine / Ouskova, Olena et al. | IEEE | 2023


    Vector Vortex Waveplates with Tunable Spectrum and Switchable Topological Charge

    Nersisyan, Sarik R. / Sigley, Justin / Liao, Zhi et al. | IEEE | 2020


    Challenging fundamental limits in the fabrication of vector vortex waveplates

    Hakobyan, R.S. / Tabiryan, N.V. / Serabyn, E. | IEEE | 2013