Eventos
O xoves 8 de outubro de 2026, o Dr. A. García-Martín (Instituto de Micro y Nanotecnología IMN-CNM, CSIC - CEI UAM+CSIC, Madrid) ofrecerá o seminario "VO2 Phase Control and qBIC-Enhanced Non-Reciprocity in Nanophotonic Metasurfaces" dentro do ciclo CINBIO Seminar Programme.
Será ás 11:00 horas na Sala de Seminarios de Torre CACTI.
ABSTRACT:
In this presentation I will address engineered metasurfaces involving external tuning via vanadium dioxide (VO2) and non-reciprocal enhancement via quasi-bound states in the continuum (qBICs).
VO2 exhibits a notable insulator-to-metal transition at 68°C with a dramatic change in electrical resistivity, enabling applications in photodetection and bolometry. Two VO2-based systems are examined: arrays of gold (Au) nanodisks embedded in VO2 thin films to reduce the laser power needed for phase transition by 30% through localized plasmonic field enhancement[1]; and perforated Au films with sub-micron slits on VO2 to enable temperature-controlled reflectance modulation from 90% to 10%, acting as optical valves[2].
In parallel, qBIC phenomena in tilted silicon (Si) nanodisks and n-doped indium antimonide (InSb) micropillar metasurfaces are investigated. Overlapping dipolar resonances produce dark and asymmetric qBICs at modified Brewster angles, resulting in cloaked excitation with strong near-field enhancement and minimal reflection[3]. In magneto-optical InSb metasurfaces under external magnetic fields, qBICs enhance non-reciprocal cross-polarization coupling, tunable via structural tilting. These effects facilitate low-power, tunable optical switching and amplified magneto-optical responses[4].
Together, these studies demonstrate how structural design, resonance hybridization, and external stimuli such as temperature and magnetic fields enable novel, tunable nanophotonic devices with enhanced light–matter interactions.
References
[1] Z. Fang et al., Surfaces & Interfaces 62, 106145 (2025)
[2] A. Garcia-Martin, et al., Physical Review Research 7, 023301 (2025)
[3] L. Hidalgo-Arteaga et al., Laser Photonics Rev. 19, 2500799 (2025)
[4] B. Castillo Lopez de Larrinzar, et al., Journal of Physics: Photonics 8, 035027 (2026)
SHORT BIO:
Research Scientist in the Spanish Council of Scientific Research (CSIC), with scientific interests in the area of nanophotonics, (with some extension to other wave phenomena). The research activities are undeniably framed in theoretical research, but working closely with experimental teams. Among them, it is particularly interesting the study of the wave interaction with complex resonant nanostructures, focusing in those with some kind of broken symmetries and external control. These include metallic resonant structures (plasmonics and chiral plasmonics, acousto-plasmonics), high refractive index (lossless) materials, or those possessing simultaneously magneto-optical activity and resonant excitations (magneto-plasmonic materials) and phase change materials. This gives rise to a plethora of application possibilities such as photonic crystal-based devices, sensors, modulators, energy harvesters, thermal emitters and diverse types of transducers.
