A5078751871- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Photonic Crystals and Applications
- Metamaterials and Metasurfaces Applications
- Ovarian cancer diagnosis and treatment
- Orbital Angular Momentum in Optics
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Advanced Photonic Communication Systems
- Mechanical and Optical Resonators
- Ovarian function and disorders
- Advanced Fluorescence Microscopy Techniques
- Fern and Epiphyte Biology
- Advanced Antenna and Metasurface Technologies
- Nonlinear Optical Materials Studies
- Cytokine Signaling Pathways and Interactions
- Gyrotron and Vacuum Electronics Research
- Liquid Crystal Research Advancements
- FOXO transcription factor regulation
- Gold and Silver Nanoparticles Synthesis and Applications
- Nonlinear Photonic Systems
- Reproductive Biology and Fertility
- Optical Polarization and Ellipsometry
University of Ottawa
2015-2025
University of Nottingham
2024
Max Planck - University of Ottawa Centre for Extreme and Quantum Photonics
2015-2019
Kyoto University
2007-2015
Kyoto Katsura Hospital
2008-2013
McGill University
2006
Abstract Light beams with a helical phase-front possess orbital angular momentum along their direction of propagation in addition to the spin that describes polarisation. Until recently, it was thought these two ‘rotational’ motions light were largely independent and could not be coupled during light–matter interactions. However, is now known interactions carefully designed complex media can result spin-to-orbit coupling, where change will modify vice versa . In this work, we propose...
Plasmonic nanostructures hold promise for the realization of ultra-thin sub-wavelength devices, reducing power operating thresholds and enabling nonlinear optical functionality in metasurfaces. However, this is substantially undercut by absorption introduced resistive losses, causing metasurface community to turn away from plasmonics favour alternative material platforms (e.g., dielectrics) that provide weaker field enhancement, but more tolerable losses. Here, we report a plasmonic with...
Resonant systems with high bandwidth The performance of an active system, whether it is optical, electrical, or mechanical, often described by its quality ( Q ) factor. Typically, one learns the rule that higher factor, sharper resonance—that is, device reduced. Tsakmakidis et al. show this indeed case, but only for symmetric systems. However, case asymmetric (or nonreciprocal) systems, need not be obeyed. They theoretically more a system wider can be. effect raises prospect designing high-...
Abstract Space-time duality in paraxial optical wave propagation implies the existence of intriguing effects when light interacts with a material exhibiting two refractive indexes separated by boundary time. The direct consequence such time-refraction effect is change frequency while leaving wavevector unchanged. Here, we experimentally show that time refraction significantly enhanced an epsilon-near-zero (ENZ) medium as optically induced unity-order index sub-picosecond scale. Specifically,...
Here we present a roadmap on Photonic metasurfaces. This document consists of number perspective articles different applications, challenge areas or technologies underlying photonic Each will introduce the topic, state art as well give an insight into future direction subfield.
Orbital angular momentum associated with the helical phase-front of optical beams provides an unbounded “space” for both classical and quantum communications. Among different approaches to generate manipulate orbital states light, coupling between spin allows a faster manipulation because it depends on manipulating polarisation state which is simpler generally than conventional generators. In this work, we design fabricate ultra-thin spin-to-orbital converter, based plasmonic nano-antennas...
Abstract Metamaterials and metasurfaces provide a paradigm-changing approach for manipulating light. Their potential has been evinced by recent demonstrations of chiral responses much greater than those natural materials. Here, we demonstrate theoretically experimentally that the extrinsic response metasurface can be dramatically enhanced near-field diffraction effects. At core this phenomenon are lattice plasmon modes respond selectively to illumination’s polarization handedness. The...
Ovarian fibrosis is a pathological condition associated with aging and responsible for variety of ovarian dysfunctions. Given the known contributions tissue to tumorigenesis, it anticipated that may contribute cancer risk. We recently reported diabetic postmenopausal women using metformin had collagen abundance organization were similar premenopausal ovaries from nondiabetic women. In this study, we investigated effects on mouse at single-cell level. discovered treatment prevented...
We show that standard approximations in nonlinear optics are violated for situations involving a small value of the linear refractive index. Consequently, conventional equation intensity-dependent index, n(I)=n0+n2I, becomes inapplicable epsilon-near-zero and low-index media, even presence only third-order effects. For particular case indium tin oxide, we find χ(3), χ(5), χ(7) contributions to refraction eclipse term; thus, response can no longer be interpreted as perturbation these...
We demonstrate second-harmonic generation (SHG) in a silicon-carbide (SiC)-based heterostructure photonic crystal nanocavity by using pulsed laser. observe SHG light radiated from the SiC and estimate conversion efficiency cavity to be 2.59×10(-5) (=0.15 W(-1)) at an average input power of 0.17 mW. The near-field patterns polarization characteristics are investigated experimentally theoretically, results qualitatively good agreement.
Materials with vanishing permittivity (epsilon-near-zero or ENZ materials) show unconventional optical behavior. Here we that plasmonic dipole antennas on an ultrathin substrate have properties significantly different from a traditional substrate. Specifically, the presence of 23-nm-thick material strongly modifies linear response and, as result, resonant wavelength is independent dimensions antenna.
Histopathological image analysis of stained tissue slides is routinely used in tumor detection and classification. However, diagnosis requires a highly trained pathologist can thus be time-consuming, labor-intensive, potentially risk bias. Here, we demonstrate potential complementary approach for diagnosis. We show that multiphoton microscopy images from unstained, reproductive tissues robustly classified using deep learning techniques. fine-train four pretrained convolutional neural...
Slow light photonic crystal waveguides tightly compress propagating and increase interaction times, showing immense potential for all-optical delay enhanced light-matter interactions. Yet, their practical application has largely been limited to moderate group index values (<100), due a lack of that reliably demonstrate slower light. This limitation persists because nearly all such research focused on single lattice type: the triangular lattice. Here, we present based kagome an intrinsically...
Converting spin angular momentum to orbital has been shown be a practical and efficient method for generating optical beams carrying possessing space-varying polarized field.Here, we present novel liquid crystal devices tailoring the wavefront of through Pancharatnam-Berry phase concept.We demonstrate versatility these by an extensive range such as ±200 units along with Bessel, Airy Ince-Gauss beams.We characterize both polarization properties generated beams, confirming our devices' performance.
Abstract Integrating the large, subpicosecond nonlinear optical response of epsilon-near-zero (ENZ) materials with broad design freedoms plasmonic metasurfaces shows potential for creating rapidly modulated devices possible applications in telecommunications, sensing, and reactive beam steering. In this work, we experimentally investigate a metasurface consisting gradient array on thin layer indium tin oxide (ITO), characterize how incident probe pulses diffract from system as it is being...
Hyperentanglement, which refers to entanglement across more than one degree of freedom (DoF), is a valuable resource in photonic quantum information technology. However, the lack efficient characterization schemes hinders its quantitative study and application potential. Here, we present rapid spatial-polarization hyperentangled biphoton state produced from spontaneous parametric down-conversion. We first demonstrate certification hyperentanglement dimensionality with cumulative acquisition...
The orbital angular momentum (OAM) carried by optical beams is a useful quantity for encoding information. This form of has been incorporated into various works ranging from telecommunications to quantum cryptography, most which require methods that can rapidly process the OAM content beam. Among current state-of-the-art schemes readily acquire this information are so-called sorters, consist devices spatially separate components Such have found numerous applications in communications, field...
The utility of all parametric nonlinear optical processes is hampered by phase-matching requirements. Quasi-phase-matching, birefringent phase matching, and higher-order-mode matching have been developed to address this constraint, but the methods demonstrated date suffer from inconvenience only being matched for a single, specific arrangement beams, typically copropagating, resulting in cumbersome experimental configurations large footprints integrated devices. Here, we experimentally...
Resonances in optical systems are useful for many applications, such as frequency comb generation, filtering, and biosensing. However, of these applications difficult to implement metasurfaces because traditional approaches designing multiresonant nanostructures require significant computational fabrication efforts. To address this challenge, we introduce the concept Fourier lattice resonances (FLRs) which multiple desired can be chosen a priori used dictate metasurface design. Because each...
We demonstrate experimentally on-the-fly wavelength conversion of photons as they propagate along a photonic crystal waveguide by dynamically controlling the mode. This allows for broad-band, highly efficient form without restrictive resonator systems considered necessary until now. On-the-fly can be directly integrated with other nano-devices to provide dynamic functionality. technique is anticipated have significant impact on various applications including advanced circuits, stopping (or...