Publications by Luis Guillermo Villanueva Torrijo

Hydrodynamic Cavitation-Induced Thrombolysis on a Clot-on-a-Chip Platform

Complications from thrombosis constitute a massive global burden for human health. Current treatment methods have limitations and can cause serious adverse effects. Hydrodynamic cavitation (HC) is a physical phenomenon where bubbles develop and collapse ra ...

2025

Fabrication of fluid-compatible trilayer cantilevers with integrated piezoelectric actuators

Luis Guillermo Villanueva Torrijo, Georg Fantner, Damien Maillard, Nahid Hosseini, Matthias Neuenschwander, Mustafa Kangül

Microcantilevers are popular transducers thanks to their simple design and a high sensitivity. In many applications, the cantilevers need to be actuated, either to induce a controlled deflection or to excite the resonance. This can be achieved with integra ...

2025

Measuring direct flexoelectricity at the nanoscale

Luis Guillermo Villanueva Torrijo, Daniel Moreno Garcia

Flexoelectricity is a property of all dielectric materials, where inhomogeneous strain induces electrical polarization. This effect becomes particularly prominent at the nanoscale where larger strain gradients can be obtained. While flexoelectric charges h ...

Institute of Electrical and Electronics Engineers2025

Suspended lithium niobate acoustic resonators with Damascene electrodes for radiofrequency filtering

Luis Guillermo Villanueva Torrijo, Silvan Stettler

Data rates and volume for mobile communication are ever-increasing with the growing number of users and connected devices. With the deployment of 5G and 6G on the horizon, wireless communication is advancing to higher frequencies and larger bandwidths enab ...

Springer Science and Business Media LLC2025

Fabrication of periodically poled lithium niobate waveguides for broadband nonlinear photonics

Luis Guillermo Villanueva Torrijo, Furkan Ayhan

Nonlinear optics is the precursor for many of the modern-day applications of photonics, including femtosecond pulse synthesis, precision spectroscopy, and metrology. In the last decade, nanophotonic waveguides have not only boosted the efficiencies of nonl ...

2025

Ultraviolet to mid-infrared optical properties of sputtered Al(Sc)N-on-SiO2 thin films and experimental demonstration of AlN integrated photonic devices in the telecom C-band

Luis Guillermo Villanueva Torrijo

Thin film aluminum nitride (AlN) stands out as a promising material for integrated photonics due to its wide bandgap of 6.1 eV, facilitating efficient operation across diverse spectral ranges. Its inherent electro-optic and nonlinear optical properties mak ...

2024

Emulating paper: A review of reflective display technologies

Olivier Martin, Luis Guillermo Villanueva Torrijo, Dorian Giraud Herle

Reflective displays, which harness ambient light, offer energy-efficient alternatives to traditional emissive screens in mobile devices. This review provides an overview of various reflective display technologies and their comparative performance metrics. ...

2024

Ultraviolet astronomical spectrograph calibration with laser frequency combs from nanophotonic lithium niobate waveguides

Luis Guillermo Villanueva Torrijo, Furkan Ayhan

Astronomical precision spectroscopy underpins searches for life beyond Earth, direct observation of the expanding Universe and constraining the potential variability of physical constants on cosmological scales. Laser frequency combs can provide the requir ...

Nature Research2024

Optical Ring Resonators in Sputtered Aluminum Nitride on Insulator for Integrated Photonic MEMS

Luis Guillermo Villanueva Torrijo

This study explores the utilization of sputtered aluminum nitride (AlN) thin film on insulator as a platform for integrated photonic MEMS. We experimentally demonstrate proof-of-concept photonic ring resonators with Q-factors up to 31000 at a resonance wav ...

IEEE Computer Society2024

Effect of annealing on flexoelectricity in hafnium oxide (HfO2)

Luis Guillermo Villanueva Torrijo, Daniel Moreno Garcia

Flexoelectricity is universal in all dielectrics, effective at high temperatures, and a promising transduction technique for nanoelectromechanical systems (NEMS). However, as flexoelectricity is still in its early stages, many aspects require further inves ...

AIP American Institute of Physics2024