A5054908314- Photonic and Optical Devices
- Photonic Crystals and Applications
- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
- Advanced Fiber Optic Sensors
- Semiconductor Quantum Structures and Devices
- Nanowire Synthesis and Applications
- Adaptive optics and wavefront sensing
- Optical Coatings and Gratings
- Advanced Photonic Communication Systems
- GaN-based semiconductor devices and materials
- Optical Wireless Communication Technologies
- Semiconductor Lasers and Optical Devices
- Atmospheric Ozone and Climate
- Satellite Communication Systems
- Mechanical and Optical Resonators
- Optical Network Technologies
- Optical Coherence Tomography Applications
- Ga2O3 and related materials
- Photonic Crystal and Fiber Optics
- Neuroscience and Neural Engineering
- Molecular Communication and Nanonetworks
- Photoreceptor and optogenetics research
- Optical Systems and Laser Technology
- Plasmonic and Surface Plasmon Research
National Research Council Canada
2019-2024
Centre de Nanosciences et de Nanotechnologies
2024
Institute for Microstructural Sciences
2009-2023
University of Ottawa
2009-2020
Herzberg Institute of Astrophysics
2020
National Academies of Sciences, Engineering, and Medicine
2010-2011
Photonics offer numerous functionalities that can be used to realize astrophotonic instruments. The most spectacular example date is the ESO Gravity instrument at Very Large Telescope in Chile. Integrated devices stand critical advantages for development, including extreme miniaturization, as well integration, superior thermal and mechanical stabilization owing small footprint, high replicability offering cost savings. Numerous technologies have been developed address shortcomings of...
We present a quantum optics approach to describe the influence of electron-acoustic phonon coupling on emission spectra strongly coupled quantum-dot cavity system. Using canonical Hamiltonian for light quantization and photon Green function formalism, phonons are included all orders through polarizability obtained within independent boson model. derive simple user-friendly analytical expressions linear spectrum, including from both exciton- cavity-emission decay channels. In regime...
We present perfectly vertical grating couplers for the 220 nm silicon-on-insulator platform incorporating subwavelength metamaterials to increase minimum feature sizes and achieve broadband low back-reflection. Our study reveals that devices with high coupling efficiencies are distributed over a wide region of design space varied back-reflections, while still maintaining larger than 100 even 130 nm. Using 3D-finite-difference time-domain simulations, we demonstrate back-reflection less -20dB...
Site-selective epitaxy is used to deterministically control the nucleation site of a single quantum dot. A photonic crystal cavity fabricated at dot for true dot-cavity system which, by design, contains no background emitters. Cavity tuning fixed temperature measure coupling over large $(>15\text{ }\text{meV})$ detuning range using nonresonant excitation. The low-excitation spectra are modeled master equation model based on incoherent We find that pure phonon dephasing alone does not account...
Compact and efficient optical antennas are fundamental components for many applications, including high-density fiber-chip coupling phased arrays. Here we present the design of grating-based micro-antennas with perfectly vertical emission in 300-nm silicon-on-insulator platform. We leverage a methodology combining adjoint optimization machine learning dimensionality reduction to efficiently map multiparameter space antennas, analyse large number relevant performance metrics, carry out...
Abstract Intermediate band solar cells hold the promise of ultrahigh power conversion efficiencies using a single semiconductor junction. Many current implementations use materials with bandgaps too small to achieve maximum efficiency or cost-prohibitive substrates. Here we demonstrate material system for intermediate InGaN/GaN quantum-dot-in-nanowire heterostructures grown directly on silicon provide lower cost, large-bandgap cell platform. We sequential two-photon generation sub-bandgap...
Absorption spectroscopy is widely used in sensing and astronomy to understand remote molecular compositions. However, dispersive techniques require multichannel detection, reducing detection sensitivity while increasing instrument cost when compared spectrophotometric methods. We present a novel non-dispersive infrared identification scheme that performs spectral correlation optically using specially tailored integrated silicon ring resonator. show experimentally the amplitude proportional...
Optical antennas play a pivotal role in interfacing integrated photonic circuits with free-space systems. Designing for optical phased arrays ideally requires achieving compact antenna apertures, wide radiation angles, and high efficiency all at once, which presents significant challenge. Here, we experimentally demonstrate novel ultra-compact silicon grating antenna, utilizing subwavelength nanostructures arranged transversally interleaved topology to control the pattern. Through near-field...
We present a theory of valence holes as Luttinger spinor based qubits in $p$-doped self-assembled quantum dots within the four-band $k\ensuremath{\cdot}p$ formalism. The two-qubit levels are identified with two chiralities doubly degenerate ground state. show that single-qubit operations can be implemented static magnetic field applied along $z$ axis (growth direction) for ${\stackrel{\ifmmode \hat{}\else \^{}\fi{}}{\ensuremath{\sigma}}}_{z}$ operation and dot plane, $x$ direction,...
Abstract The design and benchtop operation of a wireless miniature epiretinal stimulator implant is reported. optically powered controlled using safe illumination at near‐infrared wavelengths. An application‐specific integrated circuit (ASIC) hosting digital control unit used to the implant's electrodes. ASIC an advanced photovoltaic (PV) cell programmed single photodiode. Diamond packaging technology utilized achieve high‐density integration optoelectronic circuitry, as well individual...
Silicon photonic ring resonator thermometers have been shown to provide temperature measurements with a 10 mK accuracy. In this work we identify and quantify the intrinsic on-chip impairments that may limit further improvement in measurement The arise from optically induced changes waveguide effective index, back-reflections scattering at defects interfaces inside cavity along path between light source detector. These are characterized for 220 × 500 nm Si rings by experimental calibrated...
CubeSats are low-cost, space-based platforms for sensing instrumentation, where limits on size, weight and power limitations favour using photonic integrated circuit. We explore the design performance of a proof-of-concept astrophotonic CubeSat optical astronomy.
Optical beams and starlight distorted by atmospheric turbulence can be corrected with adaptive optics systems to enable efficient coupling into single-mode fibers. Deformable mirrors, used flatten the wavefront in astronomical telescopes, are costly, sensitive, complex mechanical components that require careful calibration high-quality imaging astronomy, microscopy, vision science. They also impractical deploy large numbers for non-imaging applications like free-space optical communication....
We present a comparative experimental study of three silicon photonic echelle grating demultiplexers that are integrated with Mach-Zehnder interferometer (MZI) launch structure. By appropriate choice the MZI configuration, temperature induced shift demultiplexer channel wavelengths can be suppressed (athermal) or enhanced (super-thermal) controlled by an on-chip micro-heater. The latter two configurations allow to actively tuned using lower power than possible tuning conventional...
We present a novel, to the best of our knowledge, remote gas detection and identification technique based on correlation spectroscopy with piezoelectric tunable fiber-optic Fabry-Perot filter. show that spectral amplitude between filter transmission window absorption features is related optical depth, different gases can be distinguished from one another using their signal phase. Using previously captured telluric-corrected high-resolution near-infrared spectrum Venus, we radial velocity...
We report on simulations carried out for an integrated phase corrector that can efficiently couple the light distorted by atmospheric turbulence into a single-mode fiber (SMF). The photonic circuit (PIC) consists of square array surface grating couplers used to deflect off-plane wave vector free-space beamlets plane waveguide in chip. Resistive elements acting as heaters are subsequently stretch coiled section individual waveguides and, doing so, shift propagating modes. With correct shifts...
Optical satellite communications (OSC) downlinks can support much higher bandwidths than radio-frequency channels. However, atmospheric turbulence degrades the optical beam wavefront, leading to reduced data transfer rates. In this study, we propose using reinforcement learning (RL) as a lower-cost alternative standard wavefront sensor-based solutions. We estimate that RL has potential reduce system latency, while lowering costs by omitting sensor and low-latency processing electronics. This...
Enabled by technological improvements, photonic devices and circuits are becoming increasingly more complex. Non-trivial geometries designed to reduce device footprint, improve performance, introduce novel functionalities. However, the number of design variables required properly represent these quickly grows, limiting effectiveness classical approaches. Moreover, parameters often strongly interdependent, restricting use sequential optimizations or independent parameter sweeps. Although...
Spectral pattern recognition is used to measure temperature and generate calibrated wavelength/frequency combs using a single silicon waveguide ring resonator. The generates two incommensurate interleaving TE TM spectral that shift independently with create unique at every temperature. Following an initial calibration, the can be determined by recognizing resonance pattern, as consequence, wavelength of also known. Two methods pattern-based retrieval are presented. In first method, locked...
Photonic crystals can exhibit interesting optical properties such as peculiar dispersion, small group velocity, negative refraction and diffraction. Group velocity engineering in a certain wavelength range allows for enhanced nonlinear interactions, while higher light confinement achievable photonic crystal waveguides leads to reduced footprint integrated components. Silicon-based are relatively well studied,<sup>1–3</sup> however, they not suitable monolithic integration with active...
The emerging technology of power-by-light enables power and data delivery over a single Free Space Optical (FSO) link for electrically isolated, interference-free remote operation. Telecom wavelength bands (λ ≈ 1550 nm) are well known applications in communication optical fiber overlap atmospheric transparency windows, extending the reach FSO systems through air. This creates opportunity to directionally deliver significant (above 1mW) high speed wirelessly long distances. channels can...
Over the past 15 years since their first demonstration, subwavelength grating metamaterials in silicon photonic devices have become widely used and attracted rapidly growing research interest while also breaking into commercial applications. We will discuss recent advances this field, with a focus on novel components circuits for beam steering applications, on-chip filtering quantum optics. On-chip optical waveguides comprised of Mie resonant particle chains only recently been demonstrated...