Joan Daniel Prades

Universitat de Barcelona

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Co-Authors

A. Waag

Technische Universität Braunschweig

Francisco Hernández-Ramírez

Universidad Autónoma Metropolitana

J.R. Morante

Universitat de Barcelona

A. Cirera

Universitat de Barcelona

A. Romano‐Rodrı́guez

Universitat de Barcelona

Olga Casals

Universitat de Barcelona

Hutomo Suryo Wasisto

Technische Universität Braunschweig

Sanjay Mathur

University of Cologne

Cristian Fàbrega

Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona

ÁD

Á. Diéguez

Universitat de Barcelona

Cooperative Institutions

University of Sydney

138

Universitat de Barcelona

112

University of Bari Aldo Moro

112

Technische Universität Braunschweig

Universitat Autònoma de Barcelona

Tianjin Polytechnic University

Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona

Consejo Superior de Investigaciones Científicas

Institut de Recerca en Energia de Catalunya

University of Cologne

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Design and fabrication of AlN-on-Si chirped surface acoustic wave resonators for label-free cell detection

Journal of Physics Conference Series (2019)

Iqbal Syamsu Tony Granz Gregor Scholz Shinta Mariana Nursidik Yulianto

Abstract Chirped surface acoustic wave (SAW) resonators based on aluminum nitride (AlN) thin films have been designed and fabricated to comprehend the wave propagation characteristics induced by interdigitated transducers (IDTs) deposited on their surfaces. From the simulation results, design and geometry of the metal fingers including their width and pitch play critical roles on the wavelength of the acoustic wave and the mechanical displacement, which subsequently set the device resonant frequency. A single-step metal lift-off process involving photolithography and electron beam metal evaporation has been used to pattern and deposit Cr/Au IDT on AlN-on-Si wafers.

Interdigital transducer

10.1088/1742-6596/1319/1/012011

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Citations (4)

A new high-resolution microscopy technique

Victor Moro Joan Canals Nil Franch Sergio Ruiz Moreno Romano Romano-Rodríguez

10.5281/zenodo.3559711

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Citations (0)

Ab initio calculations of NO2 and SO2 chemisorption onto non-polar ZnO surfaces

Sensors and Actuators B Chemical (2009)

Joan Daniel Prades A. Cirera J.R. Morante

Chemisorption

Oxidizing agent

Stoichiometry

10.1016/j.snb.2009.08.017

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Citations (83)

Towards a super-resolution structured illumination microscope based on an array of nanoLEDs

Nil Franch Joan Canals Victor Moro Oscar Alonso Sergio Ruiz Moreno

This work presents a first prototype for a new approach to microscopy: a system basing its resolving power on the light emitters instead of the sensors, without using lenses. This new approach builds on the possibility of making LEDs smaller than current technology sensors, offering a new approach to microscopy we plan on developing towards superresolution. The microscope consists on a SPAD based camera, a 8x8 LED array with 5x5 μm LEDs distributed with a pitch of 10 μm, and discrete driving electronics to control them. We present simulations of the system, as well as the first microscope prototype implementing the method, and the results obtained through it.

10.1117/12.2529258

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Citations (3)

Instrumentation for Nano-Illumination Microscopy Based on InGaN/GaN NanoLED Arrays

Imaging and Applied Optics Congress (2020)

Joan Canals Sergio Ruiz Moreno Victor Moro Nil Franch Anna Vilà

New nano-illumination microscopy instrumentation will be presented together with the road to overcome the diffraction limit in order to achieve super-resolution. The simplicity of this technique would make it suitable in any low-resource scenario.

Instrumentation

Simplicity

10.1364/cosi.2020.jf1e.4

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Polarity-driven polytypic brachning in Cu-based quanternary chalcogenide nanostructures

Reza R. Zamani Lothar Houben María Ibáñez Joan Daniel Prades Jordi Arbiol

Polarity (international relations)

Source

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Design, fabrication and characterization of SU-8 and PMMA grating couplers

Optics Communications (2023)

Hongqiang Li Mengwei Cao Lu Cao Feng Ren Liu Yang

Ultrasonic grating

Cladding (metalworking)

10.1016/j.optcom.2023.129859

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Citations (4)

Ultraviolet Raman scattering in ZnO nanowires: quasimode mixing and temperature effects

Journal of Raman Spectroscopy (2010)

Esther Alarcón‐Lladó Jordi Ibáñez R. Cuscó L. Artús Joan Daniel Prades

Abstract We use near‐resonance Raman scattering to investigate zinc oxide (ZnO) nanowires grown by chemical vapor deposition on Si substrates. We discuss the role of quasimode mixing on the wavenumber of the longitudinal optical (LO) bands, and we perform Raman measurements with different excitation powers to investigate possible laser heating effects. We find that in the Raman spectra of as‐deposited nanowires grown along the c ‐axis of wurtzite, the LO bands are located slightly below the E 1 (LO) mode of bulk ZnO. We perform a calculation of the expected LO wavenumber in an ensemble of randomly oriented nanowires. Our analysis shows that light refraction, together with the orientation‐dependent cross‐section of the nanowires for the incoming light, counterbalances quasimode mixing effects in the as‐grown product, giving rise to LO bands that are barely redshifted relative to the E 1 (LO) mode. In the case of ZnO nanowires that have been mechanically removed (scratched) and subsequently deposited onto separate Si substrates, we observe clear laser‐induced heating. Temperature effects account well for the Raman wavenumber shifts displayed by the LO bands in the Raman spectra of the scratched nanowires. Copyright © 2010 John Wiley & Sons, Ltd.

Wurtzite crystal structure

Wavenumber

Ultraviolet

10.1002/jrs.2664

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Citations (24)

Photoexcited Individual Nanowires: Key Elements in Room Temperature Detection of Oxidizing Gases

AIP conference proceedings (2009)

Joan Daniel Prades R. Jiménez-Díaz Marta Manzanares Francisco Hernández-Ramírez Teresa Andreu

Illuminating metal oxide semiconductors with ultra‐violet light is a feasible alternative to activate chemical reactions at their surface and thus, using them as gas sensors without the necessity of heating them. Here, the response at room temperature of individual single‐crystalline SnO2 nanowires towards NO2 is studied in detail. The results reveal that similar responses to those obtained with thermally activated sensors can be achieved by choosing the optimal illumination conditions. This finding paves the way to the development of conductometric gas sensors operated at room temperature. The power consumption in these devices is in range with conventional micromachined sensors.

Oxidizing agent

10.1063/1.3156562

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Citations (1)

PT6.192 - Portable Fluorescence Microscope applied to Organ-on-a-Chip Models

The Poster (2024)

Sergio Ruiz Moreno Anna Vilà Joan Daniel Prades Á. Diéguez

Lab-on-a-Chip

10.5162/eurosensorsxxxvi/pt6.192

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Citations (0)