A5034235295- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Optic Sensors
- Semiconductor Quantum Structures and Devices
- Advanced Photonic Communication Systems
- Mechanical and Optical Resonators
- Misinformation and Its Impacts
- FinTech, Crowdfunding, Digital Finance
- Neural Networks and Reservoir Computing
- Spam and Phishing Detection
- Nanowire Synthesis and Applications
- Neural Networks and Applications
- Language, Metaphor, and Cognition
- Leadership, Courage, and Heroism Studies
- Photonic Crystals and Applications
- Advanced MEMS and NEMS Technologies
- Optical Network Technologies
Polytechnic University of Turin
2022-2024
Azienda Sanitaria Locale Alessandria
2022
A detailed description of the non-linear effects in silicon is needed when designing ring resonators platform. The optical field propagating waveguide strongly absorbed due to two-photon-absorption (TPA) and free-carrier-absorption (FCA), which become more prominent with increasing input power ring. We present a new approach for modelling based resonators. have numerically solved problem coupling variation refractive index loss TPA, FCA , self-heating Shockley-Read-Hall (SRH) theory...
Abstract We evaluate the degradation of 1.3 µm InAs quantum-dot laser diodes epitaxially grown on silicon. For first time, optical mechanisms are investigated by evaluating variations in gain spectra measured during a constant-current stress test. Remarkably, showed that reduction peak modal is dominant compared to increse internal absorption losses. Moreover, increase threshold current (Ith) induced was found be correlated reduction. This experimental evidence modeling variation through...
We report pump-probe measurements of time resolved optical transmission spectra Si and Si/poly-Si microrings after high free carrier densities have been generated by two-photon absorption the pump pulse. From measurements, we can extract recovery dynamics absorption, refractive index dispersion, carriers finally effective initial lifetimes. The method is validated comparing modelling simulations with measurements; obtained results are in very good agreement what predicted Shockley-Read-Hall...
We study the dynamics of hybrid integrated lasers with dispersive effective reflectivity implemented through coupled microrings in a SiN platform. investigate self-generation optical frequency combs and characterize them terms bandwidth, spectral line separation, phase amplitude noise.
We design silicon and polysilicon microring resonators with different cross-sections to minimise the nonlinear effects self-heating in SISCAP platform. show that free carrier diffusion rib waveguides reduces impact of non-linearities resulting high Q-factor low carriers lifetime.
We present a model and rigorous method to calculate the transmission coefficient of silicon micro-rings with generic waveguide cross-section including non-linear effects self-heating. The is applied design MRRs in SISCAP platform high Q reduced non-linearity. demonstrate that free carrier diffusion rib waveguides Shockely-Read-Hall recombination play fundamental role reducing impact non-linearities ring.
In this paper, after an introduction (section 1) we present the two main alternative approaches to acceptance and spread of fake news 2) focus on problem distinguishing between believing sharing 3). This becomes one topics our empirical study described in sections 4 5. particular, explore ability recognize truth published social networks relationship accuracy willingness share news. An original aspect research is use a particular version trust game, methodology developed environment...
This paper investigates the strategic role of low-informative signals – conceptualized as fake news in shaping belief formation and influencing decision-making under uncertainty. Building on experimental frameworks Exley (2016) Garcia et al. (2020), we introduce a novel design that mimics real-world misinformation through are true but partial, fostering biased beliefs. Specifically, test whether such influence individuals to favor self-serving options, particularly when misleading...
We present a new approach for the modelling of non-linear effects in silicon based ring resonators by coupling equations Two-Photon-Absorption (TPA), Free-Carrier-Absortpion (FCA) and self-heating with Shockley–Read–Hall theory involving trap-assisted recombination processes. SRH gives carrier lifetime which is essential to fit model results experiments. The developed validated comparison experimental measurements performed on different types it employed design rings minimal integration...
We model and simulate non-linear effects self-heating in MRRs silicon photonic platform with generic waveguide cross sections. demonstrate that free carrier diffusion rib waveguides plays a fundamental role reducing the non-linearties. Optimal sections high Q microrings are designed for SISCAP platform.
We report pump-probe experiments for measuring free carrier lifetime in Si and Si/poly-Si microrings compare results with trap-assisted Shockley-Read-Hall recombination model.