Programa del congreso

High-index dielectric disks with subwavelength dimensions seem relatively simple electromagnetic structures. However, they can give rise to exotic phenomena in nanophotonics. Here we show recent findings that show that high-index disks can be used to manipulate light in subwavelength dimensions as a result of Mie and Fabry-Perot resonances. We also propose that such disks can be used for new applications in photonic integrated circuits (PICs) using silicon technology.

The occurrence of many intriguing and useful non-classical phenomena lies in the interplay between interference and losses. Losses are usually understood as a detrimental effect, but they also constitute a degree of freedom for the engineering of quantum processes. Herein, we present a simplified procedure to compute the matrix describing quantum state transformations in N-ports lossy devices. This procedure could be applied to lossy devices with a scattering matrix that is unitarily diagonalizable. We employ the proposed method to analyze the performance that can be obtained when a Wilkinson power divider/combiner is excited with elementary quantum states of light. Our results suggest that Wilkinson power dividers/combiners could be of interest to optics and nanophotonics applications.

We exploit metamaterials being controlled in four dimensions (space and time) to manipulate and structure the propagation of electromangetic waves in real time. To do this, we make use of temporal boundaries where the permittivity of the medium in which the wave travels is changed rapidly in time from an isotropic to an anisotropic tensor. The physics behind such temporal boundaries will be described in detail showing how the direction of the energy propagation of the electromangetic wave can be tailored at will (temporal aiming). Moreover, it will be discussed how the amplitude of the backward wave generated by such temporal boundary can be completely eliminated (temporal Brewster angle).

En este trabajo, se presenta por primera vez un efecto de fading inducido por la dispersión con el objetivo de analizar estadísticamente su impacto en la intensidad óptica recibida de un sistema de comunicación óptica inalámbrica submarina (underwater optical wireless communication, UOWC) con el fin de proporcionar un modelo de canal UOWC más preciso que los existentes en la literatura actual. El modelo de fading desarrollado será utilizado para evaluar las prestaciones en términos de tasa de error de bit (bit error rate, BER) asintótica para altos valores de relación señal a ruido de un sistema UOWC bajo diferentes condiciones de dispersión. Los resultados obtenidos en este trabajo confirman el impacto del fading inducido por dispersión a través del empeoramiento de las prestaciones de la BER, así como una significativa penalización de potencia óptica en comparación con los sistemas donde se ignora la dispersión como fuente generadora de fading. Todos los resultados presentados aquí son validados mediante simulaciones Monte Carlo.

We present our study of the Mach-Zehnder modulator (MZM) and the transmission of pure tone radiofrequency signals through an optical fiber link. Our results show that the detected signal at the receiver vanishes at a specific frequency of the pure tone signal as a result of chromatic dispersion. The frequency notch in the link's transfer function experiences a shift as a consequence of the finite Extinction Ratio (ER) of the MZM. Here, we propose to compensate this effect using dual-drive modulators with a clever relationship between amplitudes of the signals in each electrode and analyze the range of values for which the approximation of small signal regime is valid.