topological insulators) and chemically/physically modified surfaces thereof. and beam diagnostic methods for Free Electron Lasers, A. Lindblad (Author, Ed.)

Dilute Nitride Nanowire Lasers Based on a GaAs/GaNAs Core/Shell spin texture in a 3D topological insulator2020Ingår i: Scientific Reports, ISSN 2045-2322,

Topological insulators are a phase of matter with an insulating bulk and conducting edges. A topological insulator is characterized by a bulk bandgap where topological gapless unidirectional edge states reside. These edge states are robust to any perturbation that does not close the bandgap. Topological insulators are a game-changing class of materials; charged particles can flow freely on their edges and route themselves around defects, but can't pass through their interiors. This 2021-04-14 · Photonic topological insulator laser using III-V semiconductor nanowires. A topological insulator is an extraordinary material - it acts as an electrical bulk insulator that allows an electrical current flow along its surface. The surface current is topologically protected from a defect or scatterer.

Topological insulator laser

2020-11-23 2020-10-7 · From all of this activity, it is now quite clear that currently the topological insulator laser is the most promising application of topological photonics, with many new ideas emerging, for example, utilizing topology in synthetic dimensions to force an array of semiconductor lasers to emit mode-locked pulses , which could overcome a challenge of three decades. To the best of our knowledge, this is the highest output power for the pulsed fluoride fiber laser around 2.8 μm modulated by the two-dimensional Dirac material. This letter reveals that the topological insulator can be a kind of promising nonlinear modulator for a mid-infrared laser. 2019-5-22 · topological insulators can become saturated under strong exci-tation. In this work, with Bi 2Se 3 as an example, it was demon-strated that a topological insulator can modulate the operation of a bulk solid-state laser by taking advantage of its saturable absorption. The … Topological photonics has recently been proved a robust framework for manipulating light. Active topological photonic systems, in particular, enable richer fundamental physics by employing nonlinear light-matter interactions, thereby opening a new landscape for applications such as topological lasing.

On the technological side, the topological insulator laser provides a route to make many semiconductor lasers to operate as a single-mode high-power laser, while coupled efficiently into an output

3). The residual un-uniformity of illumination results in … The formation of various multi-soliton patterns and noise-like pulse in a fiber laser passively mode-locked by a topological insulator based saturable absorber.

in e.g. a Semenoff insulator. Such experiments would also link our exciton- polariton platform to the recently observed topological insulator laser [30,31]. Due to

The proposed system is realized as a truncated array of lasing helical waveguides, where the We introduce a class of topological lasers based on the photonic Floquet topological insulator concept.

[Image: S. Wittek (CREOL) and M.A. Bandres (Technion)] Here we propose an all-dielectric topological insulator laser scheme in the telecommunication region based on semiconductor cavities formed by topologically distinct Kagome photonic crystals. We demonstrate a nonmagnetic topological insulator laser exhibiting topologically-protected transport. The topological properties of the system give rise to single mode lasing, robustness against fabrication defects, and higher slope efficiencies compared to its trivial counterpart. Topological insulators are electrically insulating in their bulk, but they can conduct electricity extremely well on their surfaces (or edges) via special electronic states that are protected from fluctuations in their environment. Within these states, electrons can only travel in one direction (or channel) and do not backscatter. Topological insulators were first realized in 2D in system containing HgTe quantum wells sandwiched between cadmium telluride in 2007. The first 3D topological insulator to be realized experimentally was Bi 1 − x Sb x.
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Upload an image to customize your repository’s social media preview. Images should be at least 640×320px (1280×640px for best display). Abstract We reported on the generation of femtosecond pulse in a fiber ring laser by using a polyvinyl alcohol (PVA)-based topological insulator (TI), Bi 2 Se 3 saturable absorber (SA). The PVA-TI composite has a low saturable optical intensity of 12 MW/cm 2 and a modulation depth of ~3.9%.
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Abstract We reported on the generation of femtosecond pulse in a fiber ring laser by using a polyvinyl alcohol (PVA)-based topological insulator (TI), Bi 2 Se 3 saturable absorber (SA). The PVA-TI composite has a low saturable optical intensity of 12 MW/cm 2 and a modulation depth of ~3.9%.

a Semenoff insulator. Such experiments would also link our exciton- polariton platform to the recently observed topological insulator laser [30,31]. Due to Q-switched mode-locking Nd:YVO4 solid-state laser at 1-µm wavelength using a topological insulator Bi2Te3 as saturable absorber. In the experiment, we have states from photonic topological insulators (PTIs) are robust against local perturbations and single-frequency topological insulator laser generation. When the 15 Feb 2018 The results of the “nonmagnetic topological insulator laser” are presented in two research papers in Science, one describing the theory of 15 Jul 2019 Abstract The recent realization of photonic topological insulators has brought the discovery of fundamentally new Laser & Photonics Reviews.