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For the near-infrared (near-IR) optical data communications, silicon photonics became a mature technology. Building on the technological developments associated with datacoms, silicon photonics now expands into the mid-infrared (mid-IR), mostly for the optical gas sensing. Here as well, the development is hampered by the absence of monolithically integrated laser sources compatible with the CMOS fab...
As a promising device platform technology for optical switches, silicon photonics is recently attracting much attention. In this paper, we demonstrate compact 8×8 silicon photonic switch modules with low loss, low polarization sensitivity, and low cross-talk properties. These optical switch modules are intended for applying to ROADMs in telecom optical networks, but port count extensibility using...
Mid infrared silicon photonic integrated components, namely grating couplers, strip and slot waveguides, slotted and un-slotted photonic crystal waveguides, photonic crystal microcavities are experimentally demonstrated in silicon-on-sapphire. Application in trace gas sensing is experimentally demonstrated. Progress towards monolithic integration of lasers and detectors are discussed.
We report on the realization of high-Q/V silicon photonic crystal cavities with resonance wavelengths in the telecom window around 1.55 µm. The cavity designs are based on an effective Aubry-Andrè-Harper bichromatic potential, defined by the superposition of two one-dimensional lattices with an incommensurate ratio between their periodicity constants. This peculiar confinement mechanism allows to...
In this paper, a review of the current state of the art of Silicon Nitride photonics integration platforms is presented. These platforms are nowadays employed primarily for bio-photonics and telecom applications, ranging from the visible to the long near infrared. Prospects for the extension to mid- infrared wavelengths and applications are also presented and discussed.
This paper describes the design, fabrication and characterization of an in-plane positioning system within a thick (16 micrometers) silicon dioxide photonic-material stack. This is part of a proposed novel photonic alignment scheme, targeting at highly-automated assembly and high-precision alignment of multi-port photonic chips. Creating such functionality in thick silicon dioxide is challenging because...
In this work, we demonstrate an integrated electronic-photonic platform in a standard 65 nm microelectronic CMOS 300 mm foundry. Alongside electronics, we monolithically integrate silicon avalanche photodiodes and optical waveguides that operate from violet to NIR through a mask-less post-CMOS-compatible fabrication process.
We review our recent progress on silicon photonic switches based on electro-optic dualring assisted MZI switch elements. The ring resonances are aligned using thermal tuning to set the initial switching state. Nano-second switching is realized upon free-carrier injection with PIN diodes in the ring resonators.
A monolithic integrated photonic platform is essentially required for a broad range of applications, including optical interconnect, quantum information processing, lighting, display, and sensing. To date, however, a ubiquitous platform for photonic integration has remained elusive. While Si photonics has been extensively studied, it has several serious shortcomings [1], including optical absorption...
Silicon photonic interconnects are being considered for integration in future networks-on-chip (NoCs) as they can enable higher bandwidth and lower latency data transfers at the speed of light. Such photonic interconnects consist of photonic waveguides with dense-wavelength-division-multiplexing (DWDM) for signal traversal and microring resonators (MRs) for signal modulation and detection. To enable...
The experimental results acquired on avalanche photodiodes based on III-V semiconductor materials and operated as single photon counters with picosecond timing resolution are reported. The semiconductor structures fabricated on the basis of GaAs, GaP and GaAsP have been operated in a Geiger mode and employed in a photon counting experiment at the wavelengths from near ultraviolet to near infrared...
A promising design for novel mid-infrared integrated Fabry-Perot cavities based on Bragg grating is presented. These cavities show good potential for several applications, including sensing, optical metrology, thermal imaging or free-space communications.
The Forked Grating Coupler (FGC) is a novel silicon photonics device that can interface with Optical Vortex (OV) light beams. First generation FGC devices had long adiabatic feed tapers and flat-amplitude grating apodization functions. This resulted in an inconveniently large device with degraded OV mode fidelity. New designs have been developed with a focused forked gratings allowing size to be reduced...
The study of the evolution of quantum states performed with photonic techniques, commonly requires the use of complex interferometric schemes [1]. Here we present a novel setup based on multipass bulk interference that allows to recreate and measure different kinds of quantum state evolutions, passing from sequential maps to quantum walks.
Making use of the attractive properties of silicon (Si), a wide array of highly functional photonic devices have been demonstrated over the past few decades [1]. Although planar platforms are still the most prominent choice for integrated systems, more recently silicon fibres have gained increased attention due to their simple fabrication methods and flexible device designs [2]. However, despite their...
Interference between single photons lies at the heart of linear optical quantum computing (LOQC). However, the lack of deterministic single photon sources hinders the large-scale experimental demonstration and its practical applications, as the probability to generate N single photons simultaneously (denoted by N-photon hereafter) decreases exponentially with the increasing number of single photon...
Crystalline silicon, used as a base material in the electronics industry, has been widely investigated in a variety of fields; particularly, nano- or micro-structured crystalline silicon will act as a fundamental element for photonics, photonic crystals, and solar cells.
Optical coherence tomography (OCT) is a non-invasive imaging technique with many applications and widespread use in ophthalmology [1]. The axial resolution in OCT is inversely proportional to the bandwidth of the optical source used, but the improved axial resolution comes at the price of more significant effects of dispersion stemming from the imaging system and the imaged medium. In recent years,...
In nanofabrication, it is a major challenge to characterize the structure of a real sample, in particular of three-dimensional (3D) ones that control non-linear optics or quantum dot emission [1]. The challenge notably pertains to nanophotonic media whose properties are determined by their complex structure with feature sizes d comparable to or even less than the wavelength of light (d<2). These...
Similar to their plasmonic counterparts, dielectric nanoantennas have the ability to manipulate the emission properties of nanoscale emitters placed in their vicinity. Most importantly, they can increase the radiative decay rate of emitters by coupling to Mie-type resonances and/or shape the emission into directional patterns [1]. While considerable theoretical work has been dedicated to the study...
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