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Lopez V.,Ibero-American University of Mexico | Gonzalez-Vega A.,University of Guanajuato | Aguilar A.,Cento de Investigaciones en Optica | Aguilar A.,CNRS Hubert Curien Laboratory | And 3 more authors.
Optics Communications | Year: 2015

Liquid crystal on silicon (LCoS) spatial light modulators have been considered for a wide variety of scientific applications, due to their phase modulation capability and high spatial resolution. Nevertheless, their intrinsic characteristics, like the extensively studied depolarization and phase shift fluctuations, can make their behavior significantly distant from the ideal and somewhat unpredictable. Here, we present the characterization of a different source of uncertainty: the non-uniform spatial response of the LCoS, which is fundamentally different to the static aberrations of the panel. We measured local deviations of ±22% from the expected phase shift, resulting in non-negligible effects for phase modulation measurements, phase shifting interferometry, wavefront correction, and speckle interferometry. © 2015 Elsevier B.V.


Zarazua I.,Cento de Investigaciones en Optica | De La Rosa E.,Cento de Investigaciones en Optica | Lopez-Luke T.,Cento de Investigaciones en Optica | Reyes J.,University of Colima | Ruiz S.,Cento de Investigaciones en Optica
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

In this work, the preparation and photovoltaic conversion characterization of 10 μm films of sensitized TiO2 is reported. The 13 nm TiO 2 nanocrystals with anatase crystalline phase were deposited on an FTO substrate and decorated with Au nanocrystals and sensitized with CdSe Quantum dots (QD) and poly(3-octylthiophene) (P3OT) in different configurations. The photocurrent was measured in a three electrode electrochemical cell. The results exhibited that TiO2/Au/QD/P3OT films have the largest photocurrent, giving approximately fivefold the photocurrent of TiO2 films sensitized only with QD and near sevenfold the photocurrent of Au decorated TiO2 films. These results are attributed to the ability of the Au nanocrystals to extract electrons from QD and the photogeneration and hole transport of P3OT. Both phenomena combined with the QD's photogeneration give a great amount of electrons that increase the photocurrent generation. © 2010 SPIE.

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