Nonlinear optics, nanophotonics and plasmonics - 7Virtual room: CMC - 1
|Wednesday, May 27|
NL-7-27-1 / Topological light sources and sensors
* Boubacar Kante, UC Berkeley, United States
Topology has revolutionized our understanding of materials and led to a new classification of materials that goes beyond the Landau spontaneous symmetry-breaking theory. Recently, topological principles have been transposed to bosonic systems, and, they constitute additional degrees of freedom that can be harnessed to address challenges in controlling light. I will discuss our pioneering demonstration of topological lasers that generates coherent light non-reciprocally and devices that can be developed using the proposed principles. I will also discuss how topological singularities known as exceptional points can be implemented at electronic length-scales using plasmons and how the “exceptional plasmon” enables sensors beating current plasmonic sensors by more than two orders of magnitude.
NL-7-27-2 / Topological quantum photonics in silicon
* Andrea Blanco-Redondo, NOKIA Bell Labs, United States
Silicon photonics is bound to play a key role in quantum information technologies given its compactness, low power requirements, CMOS-compatibility, room-temperature operation, and the inherent high speed and low noise of photons. The remarkable robustness to disorder and imperfections manifested by photonic states in topological systems emerges as a fascinating research avenue to increase the scalability of silicon quantum photonic technologies. This paper highlights some of the pioneering experimental efforts to understand the potential of topological protection on quantum photonic states and to outline a path toward robust quantum circuits.
NL-7-27-3 / Theory of Intrinsic Propagation Losses in Topological Edge States of Planar Photonic Crystals
* Erik Sauer, Queen's University, Canada
Juan Pablo Vasco, Queen's University
Stephen Hughes, Queen's University
Conventional photonic crystals slab waveguide designs have been shown to be prone to disorder-induced backscattering. However, it has been proposed that topological waveguide structures may mitigate this issue using photonic edge states, allowing for scatter-free propagation through the photonic crystal structure. Using a computationally efficient guided-mode expansion method, the intrinsic propagation losses of several topological photonic crystal slab waveguide structures are examined and are shown to be significant.
NL-7-27-4 / Electro-optic detection of terahertz radiation in zinc sulfide (ZnS) crystal using second harmonic of Ytterbium laser
* Nkeck Joel Edouard, Ecole de Technologie Supérieure, Canada
Xavier Ropagnol, Ecole de Technologie Supérieure
Riad Nechache, Ecole de Technologie Supérieure
François Blanchard, Ecole de Technologie Supérieure
We report on the electro-optical (EO) detection of terahertz (THz) pulses using a <110> zinc sulphide (ZnS) crystal and the second harmonic (SH) of an amplified Ytterbium (Yb) laser at 514 nm. The performance of EO detection at 514 nm is compared with a standard EO detection using the fundamental wavelength of the Yb laser (1028 nm) and a (110) CdTe crystal.
NL-7-27-5 / Nonlinear Response of Water Vapour at the THz Frequencies
* Payman Rasekh, University of Ottawa, Canada
Akbar Safari, University of Ottawa
Murat Yildirim, University of Ottawa
Ravi Bhardwaj, University of Ottawa
Jean-Michel Ménard, University of Ottawa
Ksenia Dolgaleva, University of Ottawa
Robert W. Boyd, University of Ottawa
Terahertz (THz) nonlinear optics is an emerging field thanks to recent developments in the generation of THz pulses with higher intensities. THz radiation interacts with the vibrational/rotational resonances of molecules. For example, water molecules in the atmosphere show a very rich absorption spectrum with hundreds of sharp resonances below 3 THz. We report on the first experimental demonstration of the nonlinear interaction of THz pulses with water vapour. We observed a strong nonlinear response of the vibration/rotation resonances to the THz pulses in the form of reverse saturable absorption.
NL-7-27-7 / Design and modeling a mid infrared Raman laser on silicon-on-insulator
* Mohammad Ahmadi, Laval University, Canada
Wei Shi, Laval University
Loïc Bodiou, Université de Rennes 1
Sophie LaRochelle, Laval University
We design a 2.232 µm Raman laser with an on-chip ring resonator on a SOI platform compatible with standard foundry processes. Numerical analysis for the laser threshold and output power are conducted to perform the design. Taking the robustness of the design into account, we select the optimized values for the cavity parameters such as coupling coefficients and cavity length. Complete simulation of the laser shows that a minimum threshold power of 16 mW and a slope efficiency of 62% are achievable when the laser is pumped at 2 µm.
NL-7-27-8 / Boron Nitride Nanotubes as Infrared Fabry-Pérot Resonators
Cassandra Philips, University of Toronto
* Yi Fang Lai, University of Toronto, Canada
Gilbert C. Walker, University of Toronto
Boron nitride nanotubes (BNNTs) are known to sustain one-dimensional phonon polariton (PhP) waves. PhPs are quasiparticles formed by the coupling between photons and optically active phonons. In long BNNTs, standing waves of PhPs reflect off the ends of the tubes. The strong damping phenomenon results in weaker PhP intensity as the waves approach the middle of long BNNTs. Using a scattering-type near-field infrared microscope, we explore whether Fabry-Pérot resonators with reduced loss can be made from short BNNTs. COMSOL simulation results are compared with experimental data. Our results indicate that the weakened damping phenomenon in short BNNTs leads to interaction between PhP waves from both terminals of the tube, resulting in a diameter-dependent discretization of the PhPs. The two ends are also found to act as near-perfect reflectors. Our findings imply tunability of the PhPs in short BNNTs. Potential future applications of BNNT-based low-loss Fabry-Pérot resonators include waveguides and lasers.