The patterning of silicon with a period at the subwavelength scale has opened new degrees of freedom to control not only the propagation of light but also of sound. In this invited contribution, we will present our latest results on subwavelength-engineered silicon optomechanical waveguides. We harness subwavelength nanostructuration in a silicon slot waveguide to shape the distribution of the optical mode and maximize the coupling with the mechanical mode. Based on this approach, we demonstrate an enhanced Brillouin gain and a high tunability of the mechanical frequency.
In this invited presentation, we will show our most recent results on the use of subwavelength engineering of photons and phonons in suspended and non-suspended silicon optomechanical devices. These results open exciting new perspectives to exploit optomechanical effects with scalable silicon photonics technology, having great potential for applications in optical and wireless communications, radar, sensing, metrology and quantum technologies.
Periodically patterning silicon with a subwavelength period enables flexible control of the propagation of light and sound in silicon photonic circuits. In this invited presentation, we will show our most recent demonstration of supercontinuum generation in the near-IR and mid-IR using suspended silicon waveguides. We will also discuss our recent results on subwavelength engineering of photons and phonons in suspended and non-suspended silicon optomechanical cavities
Integrated optomechanical cavities allow precise control of optical and mechanical modes and enable strong photonphonon interactions in micron-scale volume, key for the implementation of microwave-photonic oscillators and quantum transducers. Silicon photonics provides low production cost and compatibility with the state-of-art optoelectronic circuitry. Thus, it is particularly interesting for the implementation of on-chip optomechanics. However, silicon has higher stiffness and acoustic velocity than the silica cladding, hampering phonon confinement in silicon-on-insulator (SOI) waveguides. Here, we present our most recent results on SOI optomechanical systems coupling mechanical and guided optical modes. The cavities use silicon pillars with subwavelength period. Strong radiation pressure is exploited to drive the optomechanical coupling. Based on this concept, we experimentally demonstrate the optomechanical coupling between photons and high-quality factor phonons in non-suspended cavities, with a great potential for applications in quantum and classical photonics.
Subwavelength metamaterials allow to synthesize tailored optical properties which enabled the demonstration of photonic devices with unprecedented performance and scale of integration. Yet, the development of metamaterial-based devices often involves a large number of interrelated parameters and figures of merit whose manual design can be impractical or lead to suboptimal solutions. In this invited talk, we will discuss the potentiality offered by multi-objective optimization and machine learning for the design of high-performance photonic devices based on metamaterials. We will present both integrated devices for on-chip photonic systems as well as recent advances in the development of devices for free-space applications and optical beam control.
Periodically patterning silicon with a subwavelength pitch opens new degrees of freedom to control the propagation of light and sound in silicon photonic circuits with unprecedented flexibility. In this invited presentation, we will show our most recent results on the use suspended silicon waveguides for supercontinuum generation in the near-IR and mid-IR. We will also discuss our recent demonstrations of subwavelength engineering of photons and phonons in suspended and non-suspended silicon optomechanical cavities
Simultaneous confinement of optical and mechanical modes is a requirement for an efficient Brillouin effect. In silicon-on-insulator (SOI) waveguides this challenge is solved by removing the silica under-cladding. Here we show that subwavelength engineering of the longitudinal and transversal geometries facilitates independent control of the photonic and phononic modes, hence allowing for strong Brillouin scattering. Here, we present a suspended silicon waveguide where a subwavelength lattice of lateral arms is used to separate the waveguide core from a phononic crystal.
The widespread use of metamaterials and non-trivial geometries has radically changed the way photonic integrated devices are developed, opening new design possibility and allowing for unprecedented performance. Yet, these devices are often described by a large number of interrelated parameters which cannot be handled manually, requiring innovative design approaches for their effective optimization. In this invited talk, we will discuss the potentiality offered by the combination of machine learning dimensionality reduction and multi-objective optimization for the design of high performance photonic integrated devices.
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