Browsing by Author "Wheatley, Robert Alastair"
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- ItemComparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe(1-x)GaxO(2) delafossite thin films grown by pulsed laser deposition methods(2017) Wheatley, Robert Alastair; Rojas de la Fuente, Susana Dennis; Oppolzer, C.; Joshi, T.; Borisov, P.; Lederman, D.; Cabrera, Alejandro Leopoldo
- ItemHydrothermal improvement for 3R-CuFeO2 delafossite growth by control of mineralizer and reaction atmosphere(2019) Roble Albeal, Martín Cristián; Rojas de la Fuente, Susana Dennis; Wheatley, Robert Alastair; Wallentowitz, Sascha; Cabrera, Alejandro Leopoldo; Díaz Droguett, Donovan Enrique
- ItemOptical detection of carbon dioxide adsorption on epitaxial CuFe1-xGaxO2 Delafossite film grown by pulse laser deposition(2016) Rojas de la Fuente, Susana Dennis; Joshi, T.; Wheatley, Robert Alastair; Sarabia Vallejos, Mauricio; Borisov, P.; Lederman, D.; Cabrera, Alejandro Leopoldo
- ItemPhase-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, BirgerMetal-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.
- ItemStructural, optoelectronic and photo-thermoelectric properties of crystalline alloy CuAlxFe1-xO2 delafossite oxide materials(2020) Wheatley, Robert Alastair; Roble Albeal, Martín Cristián; Gence, Loik; Acuña Porras, Camilo; Guzmán de la Cerda, Diego José Edgardo; Vojkovic Lagno, Smiljan Andrej; Seifert, Birger; Wallentowitz, Sascha; Volkmann, Ulrich; Díaz, Donovan; Rojas Aedo, R.; Hidalgo Rojas, D.
- ItemUnambiguous ultrashort pulse reconstruction from double spectrograms alone(2016) Seifert, Birger; Wheatley, Robert Alastair; Rojas Aedo, Ricardo; Wallentowitz, Sascha; Volkmann, Ulrich; Sperlich,
- ItemWetting properties of hydrothermally synthesized crystalline CuFeO2 delafossite porous surfaces(2019) Wheatley, Robert Alastair; Roble Albeal, Martín Cristián; Molina, S.; Díaz Droguett, Donovan Enrique; Rojas de la Fuente, Susana Dennis; Seifert, Birger; Wallentowitz, Sascha; Díaz Droguett, D. E.; Volkmann, Ulrich
- ItemWrinkled titanium nitride nanocomposite for robust bendable electrodes(2019) Gence, Loik; Escalona, M.; Castillo, C.; Quero, F.; Saikia, P.; Wheatley, Robert Alastair; Diaz-Droguett, D.E.; Retamal Ponce, María José; Volkmann, Ulrich; Bhuyan, Heman