Conference Agenda

We investigate the spatial and temporal localization properties of quasimodes of two-dimensional Vogel spirals, composed of deterministic, aperiodic arrays of electric dipoles. By determining the structural entropy and localization maps of Vogel spirals using the Green’s matrix method, we show that three distinctive decay forms of quasimodes coexist in Vogel spirals: exponential, power-law, and gaussian. These decay forms are demonstrated by a no-fitting analysis of the localization maps.

Although simulated in a variety of platforms, genuine two-dimensional realizations of quantum walks remain challenging. I will present an innovative approach to the photonic simulation of quantum walks in two dimensions, where the walker positions are encoded in the transverse-wavevector component of a single light beam. The desired dynamics is obtained by means of a regular sequence of anisotropic patterned liquid-crystal devices, which apply polarization-dependent transverse “kicks” to the photons in the beam. As an example, we engineer our quantum walk so that it realizes a periodically driven Chern insulator.

We demonstrate random lasing from a colloidal suspension via active controls. Heating the suspension locally through an external laser, with assistance from the half carbon-coated silica particle, causes the titania colloids to gather and form a high-density cluster due to the Marangoni effect. By incorporating the self-propulsion motion of the half carbon-coated particle, clusters can be arranged into arbitrary shapes through the active control of the half carbon-coated particle. As a proof of concept, the construction dynamics and the characteristics of the design of a triangular-shaped random laser are presented.