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Li, Z. (author), Xu, M. (author), Norte, R.A. (author), Aragon, A.M. (author), Steeneken, P.G. (author), Alijani, F. (author)Although strain engineering and soft-clamping techniques for attaining high Q-factors in nanoresonators have received much attention, their impact on nonlinear dynamics is not fully understood. In this study, we show that nonlinearity of high-Q Si<sub>3</sub>N<sub>4</sub> nanomechanical string resonators can be substantially tuned by support...journal article 2024
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Liu, Y. (author), Xu, M. (author), Portela, L. (author), Garbin, V. (author)Emulsions stabilized by nanoparticles, known as Pickering emulsions, exhibit remarkable stability, which enables applications ranging from encapsulation, to advanced materials, to chemical conversion. The layer of nanoparticles at the interface of Pickering droplets is a semi-permeable barrier between the two liquid phases, which can affect the...journal article 2023
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Ampudia Hernandez, Ricardo (author), Xu, M. (author), Huang, Yanqiu (author), Zuniga, Marco (author)In this paper, we propose a new approach where drones attain accurate localization by fusing information from artificial lighting and their embedded inertial and barometer sensors. Our system is able to provide accurate drone localization without the use of radios, GPS or cameras. We evaluate our framework, dubbed Firefly, with a testbed...conference paper 2023
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Manzaneque Garcia, T. (author), Ghatkesar, M.K. (author), Alijani, F. (author), Xu, M. (author), Norte, R.A. (author), Steeneken, P.G. (author)Resonant sensors hold great promise in measuring small masses, to enable future mass spectrometers, and small forces in applications like atomic and magnetic force microscopy. During the last decades, scaling down the size of resonators has led to huge enhancements in sensing resolution, but has also raised the question of what the ultimate...journal article 2023
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Li, Z. (author), Xu, M. (author), Norte, R.A. (author), Aragon, A.M. (author), van Keulen, A. (author), Alijani, F. (author), Steeneken, P.G. (author)In recent years, the Q-factor of Si 3 N 4 nanomechanical resonators has significantly been increased by soft-clamping techniques using large and complex support structures. To date, however, obtaining similar performance with smaller supports has remained a challenge. Here, we make use of torsion beam supports to tune the Q-factor of Si 3 N 4...journal article 2023
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de Groot, Lucan (author), Xu, M. (author), Zuniga, Marco (author)We explore a new alternative for drones to gather information from sensors. Instead of using the traditional radio-frequency spectrum, whose broadcast nature makes it more difficult to poll specific objects, we utilize the light spectrum. In our system, the drone carries a light, and flies to an area that it is interested in polling. Only the...conference paper 2023
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Xu, M. (author), Shin, D. (author), Sberna, P.M. (author), van der Kolk, R.J.H. (author), Cupertino, A. (author), Bessa, M.A. (author), Norte, R.A. (author)For decades, mechanical resonators with high sensitivity have been realized using thin-film materials under high tensile loads. Although there are remarkable strides in achieving low-dissipation mechanical sensors by utilizing high tensile stress, the performance of even the best strategy is limited by the tensile fracture strength of the...journal article 2023
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Xu, M. (author), den Hartog, Tim (author), Cheng, Lun (author), Wolfs, Marciano (author), Habets, Roberto (author), Rohlfs, Jelle (author), van den Ham, Jonathan (author), Meulendijks, Nicole (author), Sastre, Francesc (author), Buskens, Pascal (author)Distinguishing between photothermal and non-thermal contributions is essential in plasmon catalysis. Use of a tailored optical temperature sensor based on fiber Bragg gratings enabled us to obtain an accurate temperature map of an illuminated plasmonic catalyst bed with high spatiotemporal resolution. Its importance for quantification of the...journal article 2022
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Oosterlee, Oxana (author), Xu, M. (author), Zuniga, Marco (author)Solar cells are mainly used as power sources, but can be used for sensing as well. We propose a novel indoor system that exploits solar cells to track people by monitoring the changes in light intensity caused by their shadows and reflections as they walk by. Our framework has three main components. First, we develop a simulator based on a...journal article 2022
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Chavez Tapia, M.A. (author), Xu, M. (author), Wu, Zehang (author), Zuniga, Marco (author)A recent development in wireless communication is the use of optical shutters and smartphone cameras to create optical links solely from ambient light. At the transmitter, a liquid crystal display (LCD) modulates ambient light by changing its level of transparency. At the receiver, a smartphone camera decodes the optical pattern. This LCD-To...journal article 2022
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Xu, M. (author), Chavez Tapia, M.A. (author), Zuniga, Marco (author)There is a growing interest in exploiting ambient light for wireless communication. This new research area has two key advantages: it utilizes a free portion of the spectrum and does not require modifications of the lighting infrastructure. Most existing designs, however, rely on a single type of optical surface at the transmitter: liquid...conference paper 2022
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Rohlfs, Jelle (author), Bossers, Koen W. (author), Meulendijks, Nicole (author), Valega Mackenzie, Fidel (author), Xu, M. (author), Verheijen, Marcel A. (author), Buskens, Pascal (author), Sastre, Francesc (author)Plasmonic CO<sub>2</sub> methanation using γ-Al<sub>2</sub>O<sub>3</sub>-supported Ru nanorods was carried out under continuous-flow conditions without conventional heating, using mildly concentrated sunlight as the sole and sustainable energy source (AM 1.5, irradiance 5.5–14.4 kW·m<sup>−2</sup> = 5.5–14.4 suns). Under 12.5 suns, a CO<sub>2<...journal article 2022
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Baladi, Elham (author), Xu, M. (author), Faria, Nicolas (author), Nicholls, Jeff (author), Hum, Sean V. (author)This work presents the design and experimental validation of a dual-band fully reconfigurable circularly polarized (CP) reflectarray (RA) antenna for satellite communication applications in the Ku-band. The proposed structure operates with the downlink and uplink beams at frequency bands of [10.8-11.8] and [14-15.4] GHz, respectively....journal article 2021
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Martínez Molina, Pau (author), Meulendijks, Nicole (author), Xu, M. (author), Verheijen, Marcel A. (author), den Hartog, Tim (author), Buskens, Pascal (author), Sastre, Francesc (author)Sunlight-powered reduction of CO<sub>2</sub> to fuels and chemicals is a promising strategy to close the carbon loop and facilitate the energy transition. In this research, we demonstrate that Au nanoparticles supported on TiO<sub>2</sub> are an efficient plasmonic catalyst for the sunlight-powered reverse water-gas shift (rWGS) reaction. A...journal article 2021
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Blokker, R.J.A. (author), Xu, M. (author), Zuniga, Marco (author)Passive visible light communication (VLC) takes advantage of the pervasive nature of ambient light in our environment for wireless transmissions. The design of transmitters in passive VLC predominately uses liquid crystal displays (LCDs). While LCDs are an economical choice with low power consumption, they lack some key properties that are...journal article 2021
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Xu, M. (author), Wei, S. (author), Zlatanova, S. (author)The demand for indoor navigation is increasingly urgent in many applications such as safe management of underground spaces or location services in complex indoor environment, e.g. shopping centres, airports, museums, underground parking lot and hospitals. Indoor navigation is still a challenging research field, as currently applied indoor...journal article 2016
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Mann, Daniel (author), Nascimento Duplat, D. (author), Keul, Helmut (author), Möller, Martin (author), Verheijen, Marcel (author), Xu, M. (author), Urbach, Paul (author), Adam, A.J.L. (author), Buskens, Pascal (author)Au and Ag nanoshells are of interest for a wide range of applications. The plasmon resonance of such nanoshells is the property of interest and can be tuned in a broad spectral regime, ranging from the ultraviolet to the mid-infrared. To date, a large number of manuscripts have been published on the optics of such nanoshells. Few of these,...journal article 2016
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Xu, M. (author), Wachters, A.J.H. (author), Van Deelen, J. (author), Mourad, M.C.D. (author), Buskens, P.J.P. (author)We present a systematic study of the effect of variation of the zinc oxide (ZnO) and copper indium gallium (di)selenide (CIGS) layer thickness on the absorption characteristics of CIGS solar cells using a simulation program based on finite element method (FEM). We show that the absorption in the CIGS layer does not decrease monotonically with...journal article 2014
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Ramakrishnan, G. (author), Ramanandan, G.K.P. (author), Adam, A.J.L. (author), Xu, M. (author), Kumar, N. (author), Hendrikx, R.W.A. (author), Planken, P.C.M. (author)We report on the surprisingly strong, broadband emission of coherent terahertz pulses from ultrathin layers of semiconductors such as amorphous silicon, germanium and polycrystalline cuprous oxide deposited on gold, upon illumination with femtosecond laser pulses. The strength of the emission is surprising because the materials are considered to...journal article 2013
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Xu, M. (author)Fresh water supply and flood protection are two central issues in water management. Society needs more and more fresh water and a safe water system to guarantee a better life. A more severe climate will result in more droughts and extreme storms. As a consequence, salt water intrusion will increase. Therefore, clean and fresh water is becoming...doctoral thesis 2013
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