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Spectral performance of a zero-order liquid-crystal polymer commercial q-plate for the generation of vector beams at different wavelengths
Título : Spectral performance of a zero-order liquid-crystal polymer commercial q-plate for the generation of vector beams at different wavelengths |
Autor : Sánchez López, María del Mar Abella, Isaiah Puerto García, Daniel Davis, Jeffrey A. Moreno Soriano, Ignacio |
Editor : Elsevier |
Departamento: Departamentos de la UMH::Física Aplicada |
Fecha de publicación: 2018 |
URI : https://hdl.handle.net/11000/31236 |
Resumen :
Liquid-crystal polymer q-plates are commercial devices for generating vector beams at the design
wavelength where the device exhibits half-wave (HW) retardance. Since they are not voltage addressable,
the operational wavelength remains fixed. In this work we perform a broadband spectral characterization
of the q-plate retardance as a function of wavelength, /(k), and identify the wavelengths with retardance
values relevant for vector beam generation (p, p/2, and 3p/2). The wavelength is then used as a tuning
parameter to change the device performance from a HW q-plate to a positive-QW or a negative-QW
q-plate. These performances are analyzed using the Jones matrix formalism. We present a simple procedure
to derive the polarization distribution of the vector beams expected at these QW wavelengths, as a
superposition of the input polarization state and the output state of a HW q-plate. Experimental results
using the red and blue lines of an Ar-Kr laser and an IR laser diode of 980 nm confirm the theoretical predictions.
We show that for input linearly polarized light of 980 nm and 488 nm the device generates
hybrid vector beams (where the ellipticity varies with the azimuthal angle), while for 647 nm pure radial
vector beams with constant ellipticity are obtained. These results could extend the use of commercial
q-plates for multicolour vector beam applications.
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Palabras clave/Materias: q-plates vector beams spectral retarders orbital angular momentum space-variant phase retarders |
Área de conocimiento : CDU: Ciencias puras y naturales: Física |
Tipo documento : application/pdf |
Derechos de acceso: info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional |
DOI : https://doi.org/10.1016/j.optlastec.2018.04.008 |
Aparece en las colecciones: Instituto de Bioingeniería
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La licencia se describe como: Atribución-NonComercial-NoDerivada 4.0 Internacional.