Guido Torrese - Academia.edu (original) (raw)
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Papers by Guido Torrese
2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (AP-S/URSI)
Doctorat en sciences appliquées (FSA 3)--UCL, 200
Traveling-wave photodiodes, achieving a larger bandwidth-efficiency product than classical vertic... more Traveling-wave photodiodes, achieving a larger bandwidth-efficiency product than classical vertically illuminated photodetectors, are the key elements for ultra-wide bandwidth optical links. They can absorb high power levels, allowing to design wide dynamic range systems. In this paper, both the velocity mismatch and electrical signal reflections at both input and output device ends are investigated. Design criteria for long absorption length photodiodes, taking into account transit-time limit and microwave losses, are derived. As broadband applications require a thin intrinsic region, while wide absorbing surface are needed to reduce insertion losses, a trade-off between bandwidth and coupling efficiency has to be reached.
IEEE International SOI Conference SOI-02, 2002
Abstract The influence of HALO implantation on analog device characteristics has been studied and... more Abstract The influence of HALO implantation on analog device characteristics has been studied and compared for bulk, PD and FD SOI MOSFETs. It has been shown that whereas HALO implantation is needed for base-band applications preferably using longer channel, it has a detrimental effect for high-speed applications using minimum channel length transistors in strong inversion.
Journal of Optics A: Pure and Applied Optics, 2006
IEEE Transactions on Microwave Theory and Techniques, 2002
AbstractA fully analytical small-signal model is developed for the frequency response of traveli... more AbstractA fully analytical small-signal model is developed for the frequency response of traveling-wave photodetectors. It takes into account the dependence of the equivalent transmission-line ad-mittance on the position, induced by the nonuniform distribution of ...
Microwave and Optical Technology Letters, 2001
Microwave and Optical Technology Letters, 2001
IEEE Transactions on Microwave Theory and Techniques, 2000
Physical review. E, Statistical, nonlinear, and soft matter physics, 2006
The effective medium theory is a useful approach for investigating the electromagnetic wave propa... more The effective medium theory is a useful approach for investigating the electromagnetic wave propagation in periodic multilayer slabs. It allows accurate computation of transmission and reflection spectra as well as of phase and group velocities. In this paper we derive an exact analytical expression for the energy velocity of a one-dimensional finite photonic crystal based on the effective medium approach. It accounts for the multiple reflections within the structure which results in the characteristic oscillations of the transmission spectrum. Our analytical expression holds for an arbitrary refractive index contrast and goes beyond the limits of the standard homogenization method. In order to validate our approach, results obtained by using the all-frequency effective energy velocity have been compared to those obtained using the transfer matrix method.
Physical Review E, 2006
The effective medium theory is a useful approach for investigating the electromagnetic wave propa... more The effective medium theory is a useful approach for investigating the electromagnetic wave propagation in periodic multilayer slabs. It allows accurate computation of transmission and reflection spectra as well as of phase and group velocities. In this paper we derive an exact analytical expression for the energy velocity of a one-dimensional finite photonic crystal based on the effective medium approach. It accounts for the multiple reflections within the structure which results in the characteristic oscillations of the transmission spectrum. Our analytical expression holds for an arbitrary refractive index contrast and goes beyond the limits of the standard homogenization method. In order to validate our approach, results obtained by using the all-frequency effective energy velocity have been compared to those obtained using the transfer matrix method.
Photonics North 2004: Optical Components and Devices, 2004
2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (AP-S/URSI)
Doctorat en sciences appliquées (FSA 3)--UCL, 200
Traveling-wave photodiodes, achieving a larger bandwidth-efficiency product than classical vertic... more Traveling-wave photodiodes, achieving a larger bandwidth-efficiency product than classical vertically illuminated photodetectors, are the key elements for ultra-wide bandwidth optical links. They can absorb high power levels, allowing to design wide dynamic range systems. In this paper, both the velocity mismatch and electrical signal reflections at both input and output device ends are investigated. Design criteria for long absorption length photodiodes, taking into account transit-time limit and microwave losses, are derived. As broadband applications require a thin intrinsic region, while wide absorbing surface are needed to reduce insertion losses, a trade-off between bandwidth and coupling efficiency has to be reached.
IEEE International SOI Conference SOI-02, 2002
Abstract The influence of HALO implantation on analog device characteristics has been studied and... more Abstract The influence of HALO implantation on analog device characteristics has been studied and compared for bulk, PD and FD SOI MOSFETs. It has been shown that whereas HALO implantation is needed for base-band applications preferably using longer channel, it has a detrimental effect for high-speed applications using minimum channel length transistors in strong inversion.
Journal of Optics A: Pure and Applied Optics, 2006
IEEE Transactions on Microwave Theory and Techniques, 2002
AbstractA fully analytical small-signal model is developed for the frequency response of traveli... more AbstractA fully analytical small-signal model is developed for the frequency response of traveling-wave photodetectors. It takes into account the dependence of the equivalent transmission-line ad-mittance on the position, induced by the nonuniform distribution of ...
Microwave and Optical Technology Letters, 2001
Microwave and Optical Technology Letters, 2001
IEEE Transactions on Microwave Theory and Techniques, 2000
Physical review. E, Statistical, nonlinear, and soft matter physics, 2006
The effective medium theory is a useful approach for investigating the electromagnetic wave propa... more The effective medium theory is a useful approach for investigating the electromagnetic wave propagation in periodic multilayer slabs. It allows accurate computation of transmission and reflection spectra as well as of phase and group velocities. In this paper we derive an exact analytical expression for the energy velocity of a one-dimensional finite photonic crystal based on the effective medium approach. It accounts for the multiple reflections within the structure which results in the characteristic oscillations of the transmission spectrum. Our analytical expression holds for an arbitrary refractive index contrast and goes beyond the limits of the standard homogenization method. In order to validate our approach, results obtained by using the all-frequency effective energy velocity have been compared to those obtained using the transfer matrix method.
Physical Review E, 2006
The effective medium theory is a useful approach for investigating the electromagnetic wave propa... more The effective medium theory is a useful approach for investigating the electromagnetic wave propagation in periodic multilayer slabs. It allows accurate computation of transmission and reflection spectra as well as of phase and group velocities. In this paper we derive an exact analytical expression for the energy velocity of a one-dimensional finite photonic crystal based on the effective medium approach. It accounts for the multiple reflections within the structure which results in the characteristic oscillations of the transmission spectrum. Our analytical expression holds for an arbitrary refractive index contrast and goes beyond the limits of the standard homogenization method. In order to validate our approach, results obtained by using the all-frequency effective energy velocity have been compared to those obtained using the transfer matrix method.
Photonics North 2004: Optical Components and Devices, 2004