Papers by Massimo Brambilla
Cavity solitons in passive bulk semiconductor microcavities I Microscopic model and modulational instabilities
Journal of The Optical Society of America B-optical Physics, Nov 1, 1999
ABSTRACT
Localized Structures In Nonlinear Optical Systems And Materials
Diffractive effects in passive nonlinear optical resonators can lead to pattern forming bifurcati... more Diffractive effects in passive nonlinear optical resonators can lead to pattern forming bifurcations with subcritical character. When the pattern (in our case, a regular hexagonal lattice of intensity peaks) coexists with the homogeneous solution, localised structures can be excited, consisting in a single intensity peak in the transverse plane. This solution has the characteristics of a two-dimensional spatial soliton, and is highly degenerate with respect to the peak location. We investigate the procedures by which such peaks can be turned on by injecting narrow laser pulses, the conditions to ensure independence among the peaks and the way to erase a localised structure without affecting the others. These features suggest the possibility to encode optical information in the structure of the field profile.
Stability and chiral charge of phase solitons
We study experimentally and numerically the stability of dissipative phase solitons propagating i... more We study experimentally and numerically the stability of dissipative phase solitons propagating in a forced ring semiconductor laser. Non-instantaneous medium dynamics appears to be crucial for the selection of their chiral charge.
Quantum Noise in Nondegenerate Four-Wave Mixing Above Threshold
Nonlinear Dynamics in Optical Systems, 1990
The multimode instability in optical bistability is a relevant example of nondegenerate four-wave... more The multimode instability in optical bistability is a relevant example of nondegenerate four-wave mixing, which allows for a fully quantum microscopic theory. We calculate the spectrum of the intensity fluctuations beyond the instability threshold .
1D chirality in all-photodesigned THz metamaterials
We suggest that all-photodesigned metamaterials, sub-wavelength custom patterns of photoexcited c... more We suggest that all-photodesigned metamaterials, sub-wavelength custom patterns of photoexcited carriers on a semiconductor, can display an exotic extrinsic electromagnetic chirality in terahertz (THz) frequency range. We consider a photo-induced periodic pattern exhibiting 1D geometrical chirality (its mirror image can not be superposed onto itself by translations without rotations) and we prove that, in the long wavelength limit, te considered metamaterial configurations show an electromagnetic extrinsic chirality whose strength can be easily tune by recasting the optical illumination. Due to their extreme reconfigurability, we believe that the 1D chiral all-photodesigned metamaterials could offer opportunities for designing new reconfigurable devices for THz wave polarization manipulation.
Thermal effects and transverse structures in semiconductor microcavities
ABSTRACT
<title>Spatiotemporal instabilities in an optical parametric oscillator</title>
Proceedings of SPIE, Jul 6, 1994
ABSTRACT
Cavity light bullets: 3D self-confined structures in a passive nonlinear resonator (Invited Paper)
Proceedings of SPIE, Apr 28, 2005
We consider the paraxial model for a nonlinear resonator with a saturable absorber beyond the mea... more We consider the paraxial model for a nonlinear resonator with a saturable absorber beyond the mean-field limit. We introduce a general stability analysis to evidence modulational-instabilities leading to the destabilization of a homogeneous field profile, eventually causing the formation of 3D structures. Further on, for accessible parametric domains, we show in simulations the phenomenon of total radiation confinement leading to the formation of 3D localized bright structures. Such structures are a direct generalization of 2D Cavity Solitons, recently observed in broad-area VCSELs, but they are confined also in the propagation dimension. At difference from freely propagating light bullets, here the self-organization proceeds from the resonator feedback/dissipation, combined with diffraction and nonlinearity. We show that such cavity light bullets can be independently excited and erased by appropriate pulses. They can be addressed to form arrays in the transverse field profile as well as serial trains in the longitudinal direction of the resonator thus combining serial and parallel encoding in the same device. Once created, they endlessly travel the cavity roundtrip.
Journal of Optics, 2021
Our ability to generate new distributions of light has been remarkably enhanced in recent years. ... more Our ability to generate new distributions of light has been remarkably enhanced in recent years. At the most fundamental level, these light patterns are obtained by ingeniously combining different electromagnetic modes. Interestingly, the modal superposition occurs in the spatial, temporal as well as spatio-temporal domain. This generalized concept of structured light is being applied across the entire spectrum of optics: generating classical and quantum states of light, harnessing linear and nonlinear light-matter interactions, and advancing applications in microscopy, spectroscopy, holography, communication, and synchronization. This Roadmap highlights the common roots of these different techniques and thus establishes links between research areas that complement each other seamlessly. We provide an overview of all these areas, their backgrounds, current research, and future developments. We highlight the power of multimodal light manipulation and want to inspire new eclectic appr...
Three-dimensional pattern formation in semiconductor microcavities
SPIE Proceedings, 2007
We study pattern formation in a paraxial model for an unidirectional ring resonator filled with a... more We study pattern formation in a paraxial model for an unidirectional ring resonator filled with a semiconductor sample and driven by a coherent injected field beyond the mean field limit (MFL). We perform numerical simulations to describe the three-dimensional dynamics of the coherent field profile. For fast media spontaneous self-confinement leads to the formation of 3D dissipative addressable spatial solitons,
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Papers by Massimo Brambilla