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Autor Nogales Díaz, Emilio |
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Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plugaru, R ; Garcia, J. A. ; Tate, T. J. | Materials Research Society | 2002The luminescence properties of erbium oxide grown on crystalline and amorphous silicon substrates were studied by means of photo- and cathodoluminescence techniques. Differences in the luminescence spectra for samples grown on the two type., of [...]texto impreso
Peres, Marco ; Fernandes, A.J.S. ; Oliveira, F.J. ; Alves, L.C. ; Alves, E. ; Monteiro, T.S. ; Cardoso, S. ; Alonso Orts, Manuel ; Nogales Díaz, Emilio ; Méndez Martín, Bianchi | Electrochemical Society | 2019-06-24A thermal actuator based on thin flexible lamellas of Ga_2O_3 was designed in order to demonstrate the potential of this semiconductor for micro-opto-electro-mechanical applications (MOEMs). The working principle of these devices is based on the[...]texto impreso
Alonso Orts, Manuel ; Nogales Díaz, Emilio ; San Juan, J. M. ; Nó, M. L. ; Piqueras de Noriega, Javier ; Méndez Martín, Bianchi | Amer Physical Soc | 2018-06-07Optical microcavities are key elements in many photonic devices, and those based on distributed Bragg reflectors (DBRs) enhance dramatically the end reflectivity, allowing for higher quality factors and finesse values. Besides, they allow for wi[...]texto impreso
Nogales Díaz, Emilio ; Joachimsthaler, I. ; Heiderhoff, R. ; Piqueras de Noriega, Javier ; Balk, L.J. | American Institute of Physics | 2002-07-15Near-field cathodoluminescence (NFCL) has been used to characterize hydride vapor phase epitaxy grown n-GaN films. This technique can obtain high resolution luminescence images and perform local measurements of the diffusion length for minority [...]texto impreso
Alonso Orts, Manuel ; Chilla, Gerwin ; Hötzel, Rudolfo ; Nogales Díaz, Emilio ; San Juan, José M. ; Nó, Maria L. ; Eickhoff, Martin ; Méndez Martín, Bianchi | Optical Society of America | 2021-01-15In this Letter, we report optical confinement in the near-ultraviolet (near-UV) range in Ga2O3 nanowires (NWs) by distributed Bragg reflector (DBR) nanopatterned cavities. High-contrast DBRs, which act as the end mirrors of the cavities of the d[...]texto impreso
García Fernández, Javier ; García Carrión, Marina ; Torres Pardo, Almudena ; Martínez Casado, Ruth ; Ramírez Castellanos, Julio ; Nogales Díaz, Emilio ; González Calbet, José María ; Méndez Martín, Bianchi | Royal Society of Chemistry | 2020-02-28Herein, we achieve the synthesis and structural study of a luminescent Na-stabilized Ga-Ti oxide homologous series by atomically resolved electron microscopy. Relevant optical properties as a function of the titanium content have been revealed. [...]texto impreso
Optical energy gaps are measured for high-quality Al_(1-x)In_xN-on-GaN epilayers with a range of compositions around the lattice match point using photoluminescence and photoluminescence excitation spectroscopy. These data are combined with stru[...]texto impreso
Rodrigues, Joana ; Smazna, Daria ; Ben Sedrine, Nabiha ; Nogales Díaz, Emilio ; Adelung, Rainer ; Mishra, Yogendra K ; Méndez Martín, Bianchi ; Correia, María R. ; Monteiro, Teresa | Royal Society Chemistry | 2019-04-01ZnO microwires synthesised by the flame transport method and decorated with C_60 clusters were studied in detail by photoluminescence (PL) and cathodoluminescence (CL) techniques. The optical investigations suggest that the enhanced near band ed[...]texto impreso
Gonzalo, A. ; Nogales Díaz, Emilio ; Lorenz, K. ; Víllora, E. G. ; Shimamura, K: ; Piqueras de Noriega, Javier ; Méndez Martín, Bianchi | Elsevier Science BV | 2017-11The structural and luminescence properties of gallium oxide nanowires doped with chromium or manganese have been investigated. Undoped Ga?O? nanostructures have been fabricated by a thermal evaporation method, while doping was subsequently achie[...]texto impreso
Nogales Díaz, Emilio ; García, José A. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | American Institute of Physics | 2007-02-01Red luminescence emission from chromium doped ß-Ga_2O_3 nanowires has been studied by means of photoluminescence (PL) techniques. PL excitation shows several bands in the ultraviolet-visible region. Time decay values, obtained by time resolved P[...]texto impreso
Fabry Perot resonant modes in the optical range 660-770 nm have been detected from single and coupled Cr doped gallium oxide microwires at room temperature. The luminescence is due to chromium ions and dominated by the broad band involving the T[...]texto impreso
Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plugaru, R | IOP publishing ltd | 2001-09Scanning tunnelling microscopy (STM) has been sometimes applied in recent years to characterize porous silicon. In contrast, other forms of light emitting Si, such as nanocrystalline silicon films, prepared by different methods, have not been, o[...]texto impreso
Wang, K. ; Martin, R. W. ; O’Donnell, K. P. ; Katchkanov, V. ; Nogales Díaz, Emilio ; Lorenz, K. ; Alves, E. ; Ruffenach, S. ; Briot, O. | American Institute of Physics | 2005-09-12The intensity of Eu-related luminescence from ion-implanted GaN with a 10 nm thick AlN cap, both grown epitaxially by metal organic chemical vapor deposition (MOCVD) is increased markedly by high-temperature annealing at 1300 ?C. Photoluminescen[...]texto impreso
Alonso Orts, Manuel ; Sanchez, Ana M ; Hindmarsh, Steven A ; López, Iñaki ; Nogales Díaz, Emilio ; Piqueras de Noriega, Javier ; Méndez Martín, Bianchi | Amer Chemical Soc | 2017-01-11Tailoring the shape of complex nanostructures requires control of the growth process. In this work, we report on the selective growth of nanostructured tin oxide on gallium oxide nanowires leading to the formation of SnO_2/Ga_2O_3 complex nanost[...]texto impreso
O'Donnell, KP ; Katchkanova, V. ; Wang, K. ; Martin, R.W. ; Edwards, P.R. ; Hourahine, B. ; Nogales Díaz, Emilio ; Mosselmans, J.F.W. ; De Vries, B. | Materials Research Society | 2005This presentation reviews recent lattice location studies of rare earth (RE) ions in GaN by electron emission channelling (EC) and X-ray absorption fine structure (XAFS) techniques. These studies agree that RE ions at low concentrations (whether[...]