Ghione G.

D01–Challenges in multiphysics modeling of dual-band HgCdTe infrared detectors

Vallone M., Goano M., Tibaldi A., Hanna S., Eich D., Sieck A., Figgemeier F., Ghione G., Bertazzi F.

We present three-dimensional simulations of HgCdTe-based focal plane arrays (FPAs) with two-color and dual-band sequential infrared pixels having realistic truncated-pyramid shape taking into account the presence of compositionally-graded transition layers. Simulations emphasize the importance of a full-wave approach to the electromagnetic problem, and the evaluations of the optical and diffusive contribution to inter-pixel crosstalk indicate […]

184

D05–Enhanced dynamic properties of Ge-on-Si mode-evolution waveguide photodetectors

Palmieri A., Shafiee A., Alasio M. G. C., Tibaldi A., Ghione G., Bertazzi F., Goano M., Vallone M.

This work discusses coupled three-dimensional electromagnetic and electrical simulations of a Ge-on-Si waveguide photodetector where light is fed through a lateral waveguide. The numerical results show that this coupling solution leads to more uniform photon and carrier distributions along the Ge absorber compared to a conventional butt-coupled detector, allowing a broader electrooptical bandwidth for high […]

107

LD04–Modeling Tunnel Junctions for VCSELs: A Self-Consistent NEGF-DD Approach

Tibaldi A., Gullino A., Gonzalez Montoya J., Alasio M. G. C., Larsson A., Debernardi P., Goano M., Vallone M., Ghione G., Bellotti E., Bertazzi F.

In this work we investigate carrier transport in tunnel junctions for vertical-cavity surface-emitting lasers by a novel self-consistent simulation framework for semiconductor quantum devices. Based on a Poisson-drift-diffusion foundation, in this approach quantum features are described through a nonequilibrium Green’s function formalism. The simulator is validated through a comparison with experimental results.

225

NM05–Simulation of electro optic modulators based on plasmonic directional couplers

Ghomashi M., Tibaldi A., Bertazzi F., Vallone M., Goano M., Ghione G.

In this paper, a new concept and geometry are proposed for plasmonic modulators, whose operation is based on the coupling between two plasmonic slots. An electro-optic polymer is exploited as an active material, and the device can be implemented within a Silicon Photonics platform. The device operates at 1550nm wavelength, typical of data center or […]

PD04–Towards an efficient simulation framework for plasmonic organic hybrid E/O modulators

Tibaldi A., Ghomashi M., Bertazzi F., Vallone M., Goano M., Ghione G.

Due to the large computational resources required, with CPU times of the order of several days, full-wave optical simulators can be hardly exploited for the modeling and optimization of plasmonic organic hybrid electro/optic modulators. With the aim to drastically reduce such complexity, in this work we present a divide-et-impera strategy reducing the number of FDTD […]

110