Topological insulator lasers combine the concepts of topological insulators with the fundamentals of lasers, which introduce gain, loss, and demonstrate lasing action inatopologicalplatform.Specifically,inthepresenceofan artificial gauge field [38], an optical lattice consisting of resonators exhibits topological edge states. Incorporating

In the topological-insulator laser demonstrated by the Technion-CREOL team, laser light goes around the perimeter unobstructed by sharp corners or other local disorder, and eventually exits through the output port. [Image: S. Wittek (CREOL) and M.A. Bandres (Technion)]

(a) The photonic array consists of modulated rings, in the form of two independent rows connected by two side resonators. The blue and white staggered pattern indicates the different pumping schemes. The topological insulator studied in the latest work by Ghimire and colleagues at SLAC and Stanford University, USA, is made from the semiconductor bismuth selenide. The heavy bismuth atoms provide a strong spin-orbital force, while time-reversal symmetry is protected by what Ghimire describes as the material’s nondegenerate surface bands. Upload an image to customize your repository’s social media preview.

A Q‐switching pulses train was obtained by incorporating the SA into the laser … Topological insulators (TIs), are novel two-dimension materials, which can act as effective saturable absorbers (SAs) in a fiber laser. Moreover, based on the evanescent wave interaction, deposition of the TI on microfiber would create an effective SA, which has combined advantages from the strong nonlinear optical response in TI material together with the sufficiently-long-range interaction 2021-2-2 · A new hands-off probe uses light to explore the subtleties of electron behavior in a topological insulator . Laser light is usually linearly polarized, meaning that its waves oscillate in only one direction – up and down, in the example at left. But it can also be circularly polarized, at right, so its waves spiral like a corkscrew around Guo B. et al.

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).

Posted: Feb 01, 2018: Future of semiconductor lasing: Topological insulator lasers (Nanowerk News) Israeli and US researchers have developed a new, highly efficient coherent and robust semiconductor laser system: the topological insulator laser.The findings are presented in two new joint research papers, one describing theory ("Topological insulator laser…

Its topological properties give rise to single-mode lasing, robustness against defects, and considerably higher slope efficiencies compared to the topologically trivial counterparts. In the topological-insulator laser demonstrated by the Technion-CREOL team, laser light goes around the perimeter unobstructed by sharp corners or other local disorder, and eventually exits through the output port. [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.

2020-02-12 · Previous demonstrations of topological lasers have required an external laser source for optical pumping and have operated in the conventional optical frequency regime 5, 6, 7, 8. Here we

The topological properties give rise to single mode lasing, In the topological-insulator laser demonstrated by the Technion-CREOL team, laser light goes around the perimeter unobstructed by sharp corners or other local disorder, and eventually exits through the output port. [Image: S. Wittek (CREOL) and M.A. Bandres … 2020-3-9 utilizes the topological edge states as the lasing mode. Topological insulator lasers combine the concepts of topological insulators with the fundamentals of lasers, which introduce gain, loss, and demonstrate lasing action inatopologicalplatform.Specifically,inthepresenceofan artificial gauge field [38], an optical lattice consisting of We introduce a class of topological lasers based on the photonic Floquet topological insulator concept. The proposed system is realized as a truncated array of lasing helical waveguides, where the 2019-10-29 · Title: Floquet topological insulator laser. Authors: Sergey K. Ivanov, Yiqi Zhang, Yaroslav V. Kartashov, Dmitry V. Skryabin (Submitted on 29 Oct 2019) Abstract: We introduce a class of topological lasers based on the photonic Floquet topological insulator concept. The proposed system is realized as a truncated array of the lasing helical Topological insulators are a phase of matter with an insulating bulk and conducting edges.

Moreover, based on the evanescent wave interaction, deposition of the TI on microfiber would create an effective SA, which has combined advantages from the strong nonlinear optical response in TI material together with the sufficiently-long-range interaction 2021-2-2 · A new hands-off probe uses light to explore the subtleties of electron behavior in a topological insulator . Laser light is usually linearly polarized, meaning that its waves oscillate in only one direction – up and down, in the example at left. But it can also be circularly polarized, at right, so its waves spiral like a corkscrew around Guo B. et al.
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This comes after having carried out such experiments on conventional insulators and semiconductors for about a decade. 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.
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TOPOLOGICAL PHOTONICS Topological insulator laser: Experiments Miguel A. Bandres,1* Steffen Wittek, 2* Gal Harari,1* Midya Parto, Jinhan Ren,2 Mordechai Segev,1† Demetrios N. Christodoulides, 2† Mercedeh Khajavikhan † Physical systems exhibiting topological inva riants are naturally endowed with robustness

The design of such a laser system is highly non-standard - a laser is an open, non-Hermitian (due to gain/loss) and nonlinear (due to saturation) system. The topological insulator laser alters current understanding of the interplay between disorder and lasing, and at the same time opens exciting possibilities in topological physics, such as 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.