Programa del congreso

Las ultimas décadas han sido testigo de espectaculares avances en la ingeniería sobre la interacción de la luz y la materia. El desarrollo de materiales nano estructurados ha permitido aumentar substancialmente la sensibilidad de diversos métodos de espectroscopia tales como la espectroscopia Raman o la espectroscopia infra-roja de absorción. Similarmente, en los últimos años se ha demostrado que ciertas nanopartículas dieléctricas y metálicas son también capaces de aumentar la interacción quiral de la luz y la materia. En particular, diversos trabajos han probado que estas nanopartículas (o antenas ópticas) permiten aumentar la sensibilidad de la espectroscopia de Dicroísmo Circular, así como la efectividad de métodos de separación de enantiómeros moleculares mediante fotólisis inducida por luz. Esta contribución repasa las capacidades de estas nano estructuras metálicas y dieléctricas para estas aplicaciones de identificación y resolución de moléculas quirales.

In recent years, optical designs have appeared as an alternative to traditional electronic-based computers in the search for a smaller footprint and energy consumption. However, the linearity of the wave equation has not been fully exploited as it allows for inherent parallelization due to bandwidth limitations of the optimized structures. In this work, we show that a metamaterial structure formed by an inverse-designed region enclosed in a transmissive cavity within a feedback-loop allows for the simultaneous solution of an arbitrary number of independent mathematical problems in a fully analog setup using waves at different frequencies. We demonstrate this capability both numerically and experimentally for two sets of discretized integral equations using a two-level multifrequency feedback system with tailor-made unidirectional exciting and probing antennas.

Drift-biased graphene has emerged as a promising platform for nonreciprocal plasmonics. Even though the properties of the supported surface plasmons have been theoretically explored by several groups, the far-reaching applications that drift-biased graphene may enable have not yet been fully explored. In this talk, we will first briefly review the response of drift-biased graphene metasurfaces considering nonlocal effects. Then, we will present and discuss a number of potential nanophotonic applications that are currently being explored in our group, including nano-optical tweezers, terahertz and infrared spasers, deeply subwavelength plasmonic imaging, and quasi-unidirectional hyperbolic plasmons. We will finalize by providing an outlook and critical assessment of this technology, in terms of advantages and limitations with respect to common graphene plasmonics as well as challenges that remain to be solved in realistic implementations.

In this work present a photonic integrated frequency signal generator based on an asymmetric mode-locked laser (MLL) structure with frequency repetition rate of 33 GHz. The device has been fabricated in monolithic Indium Phosphide (InP) platform. The structure is composed by two reflectors, two different size semiconductors optical amplifiers (SOA) sections and an asymmetrically located saturable absorber. The ML-PIC pulses are generated at the 33.86 GHz fundamental frequency exhibiting a 3dB-linewidth around 234 kHz with a drift less than 1 MHz measured over 20 minutes in passive operation regime and a phase-noise of around -55 dBc/Hz at 100 kHz

Passive radiative cooling refers to the ability to cool an object without any external energy input, exploiting the black body radiation phenomenon experienced by any material body at a given temperature. In order to maximize this cooling capacity, the body's emissivity function must be tuned to fulfill several specific properties. Some of them are already known in the literature, but no study has been carried out so far to find the optimum emissivity as a function of both the object temperature and the room temperature. In this paper it is analysed how these two variables affect the optimal emissivity function of an arbitray body so that its cooling power is maximized.