Browsing by Author "Herrera, Felipe"

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    Bioplástico territorial: a data-driven platform for the development of bioplastics from sources of abundant biomass
    (2023) Garmulewicz, Alysia; Herrera, Felipe; Vivanco Larraín, Tomás; Hernández, Valentina; Mollenhauer Gajardo, Katherine Alexandra; Pacheco Glen, Carolina; Fuenzalida Oteiza, Catalina Belén; Pérez Peña, Gerardo Valeriano; Universidad de Santiago de Chile; Pontificia Universidad Católica de Chile; Fundación Chinquihue
    El proyecto Bioplástico Territorial tiene como objetivo proporcionar un set de datos clave para apoyar el desarrollo de un mercado nacional de bioplásticos. El enfoque se basa en la necesidad de reducir los costos de I + D de materiales, principalmente para empresarios, micro, pequeños y medianas empresas, en particular en áreas de innovación, ya que los costos de investigación son altos y de difícil acceso.
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    Phase-Coherent Optical Frequency Up-Conversion with Millimeter-Size Zn(3-ptz)2 Metal-Organic Framework Single Crystals
    (2023) Hidalgo-Rojas, Diego; Garcia-Garfido, Juan; Enriquez, Javier; Rojas-Aedo, Ricardo; Wheatley, Robert Alastair; Fritz, Ruben A.; Singh, Dinesh P.; Herrera, Felipe; Seifert, Birger
    Metal-organic frameworks (MOFs) have emerged as candidate materials for nonlinear optics due to their enhanced optical and chemical stability in comparison with conventional organic crystals. However, producing large single crystals that support perfect phase matching conditions for frequency conversion is a long-standing challenge due to the highly metastable conditions in which MOF crystals tend to self-assemble in solution. By modulating the synthesis and growth conditions, this limitation is overcome to produce millimeter-sized Zn(3-ptz)(2) uniaxial MOF single crystals. Optimized MOF crystals with large birefringence in the visible & UDelta;n & AP; -0.3 and high transparency allow for the observation of strong second-harmonic (SHG) and third-harmonic generation (THG) signals for the first time, using femtosecond near-infrared pump pulses. For conditions of type-I SHG phase-matching, the measured effective nonlinear coefficient of Zn(3-ptz)(2) is d(eff) & AP; 0.10 pm V-1, the largest measured nonlinearity for MOF materials to date. The experiments quantitatively agree with first-principles simulations based on the crystal lattice structure. The damage threshold is estimated on the order of 0.2 TW cm(-2) for raw single crystals, which can be further increased with additional crystal engineering steps. The demonstration of efficient frequency up-conversion of light with long-range phase coherence establishes MOF single crystals as promising materials for nonlinear optical devices.