By exploiting the mechanism of supercavitation we are able to realize laser-induced multi-scale structure on the surface of graphene oxide (GO) based polymeric matrices. The objective of this activity is twofold. From a fundamental point of view, we want to investigate the role of a multi-scale topological structure on the mechanism ruling the growth of microorganisms ranging from bacteria and fungi to human stem cells.… Read the rest
Author Archive for: silviag
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Entries by silviag
We have numerically studied the Anderson localization (AL) in 3D disordered systems, where its experimental demonstration is particularly tricky because of the restrictive Ioffe-Regel criterion. We employ an ab initio approach by using a finite difference time domain (FDTD) code in order to simulate a time-of-flight experiment to demonstrate the optical AL in micron-sized samples.
We also used the FDTD code to investigate the effect of disorder on the optomechanical forces.… Read the rest
The study of nonlinear propagation of light at a quantum level may offer a complete a scenario to understand the action of nonlinearity at a low photon number regime can unveil unknown and totally new optical effects.
The first phenomenon we decided to investigate is the propagation of quantum optical solitons. In fact, though classical solitons (CSs) are very well studied, QSs have a much richer dynamics that may provide many new solutions for quantum computing and cryptography.… Read the rest
Random lasers (RLs) are photonic devices whose lasing feedback is based on the multiple scattering of light by disordered structures included into an optically active medium. The spectral features of a RL arise from the delicate balance between the optical gain and the scattering efficiency of the disordered matrix. We fabricate and we do experiments on miniaturised random lasers to study the behaviour of light entrapped at micron scale and to propose novel photon devices.
The cascade of resonant PT-symmetric topological structures is shown to emit laser light with a frequency comb spectrum. We consider optically active topological lattices supporting edge modes at regularly spaced frequencies. When the amplified resonances in the PT-broken regime match the edge modes of the topological gratings, we predict the emission of discrete laser lines. A proper design enables the engineering of the spectral features for specific applications.… Read the rest
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