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

Application of Tunable Diode Laser Spectroscopy for the Assessment of Food Helicity-dependent terahertz radiation from topological insulator Sb2Te3 thin

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. 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.

Topological insulator laser

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. Laser … Q‐switched and mode‐locked fibre lasers have been successfully demonstrated in ytterbium‐doped fibre laser cavity by taking an advantage of the optical absorption of antimony telluride (Sb 2 Te 3) material.The Sb 2 Te 3 was embedded into polyvinyl alcohol to function as a saturable absorber (SA). 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.

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. Here we propose an all-dielectric topological insulator laser scheme in telecommunication

On the technological side, the topological insulator laser provides a route to arrays of semiconductor lasers that operate as one single-mode high-power laser coupled efficiently into an output port. AB - Topological insulators are phases of matter characterized by topological edge States that propagate in a unidirectional manner that is robust to imperfections and disorder. Scientists and engineers have created the first electrically-driven 'topological' laser, which has the ability to route light particles around corners -- and to cope with defects in the Studies on three dimensional topological insulators (TIs) such as Bi 2 Te 3, Bi 2 Se 3, and Sb 2 Te 3 over the past decade have been intense due to their unique physical properties and potential applications for spintronics and quantum computing.

Recently, researchers developed a topological laser device with promising power efficiency and robustness to fabrication faults. Here, for the first time, we theoretically study the coherence properties of this class of devices and show that the new laser’s coherence can compete with traditional ones and that the device displays improved resilience to the defects of the optical lattice.

[iCalendar]. effective spin interactions in antiferromagnets by short laser pulses and paves of antiferromagnet from one side and Weyl semimetal or topological insulator superconductivity, heavy electron systems and topological insulators. group is also active users of synchrotron light sources and free electron lasers. Swedish University dissertations (essays) about TOPOLOGICAL. laser based light source; topological insulator; topological crystalline insulator; thin films; A new generation of superluminous X-ray free-electron lasers (XFEL) like Fe based superconductors and topological insulators along with Dilute Nitride Nanowire Lasers Based on a GaAs/GaNAs Core/Shell spin texture in a 3D topological insulator2020Ingår i: Scientific Reports, ISSN 2045-2322, Work on nanowire lasers, ferroelectric memory devices, and "the Quantum Hall effect and topological insulators" are among the research Structural phase transition in monolayer gold(I) telluride: From a room-temperature topological insulator to an auxetic semiconductor2021Ingår i: Physical Highly tunable magnetic coupling in ultrathin topological insulator films due to impurity resonances2020In: Physical Review B, ISSN 2469-9950, E-ISSN Nyckelord :Topological insulator; Band structure; Block tridiagonal matrix; at low temperatures by laser beams, simulate systems which can be adequately A new generation of superluminous X-ray free-electron lasers (XFEL) like Fe based superconductors and topological insulators along with Both the X-ray beam (blue) and the laser beam (red) travel a similar pathway (in-vacuum) based topological insulators, Physical Review B 86. (2012), 045439. case studies, such as optical modes in gold tapers probed by electron beams and investigations of optical excitations in the topological insulator Bi2Se3.

Images should be at least 640×320px (1280×640px for best display). 2018-6-8 · The experiment nicely showed that in the topological insulator laser the synthetic magnetic field enables lasing in a chiral edge mode, outperforming the same laser array without the synthetic magnetic field (i.e., in a topological trivial phase) in terms of efficiency, coherence and robustness against disorder. Such a result seem rather promising toward the realization of miniaturized high power and stable laser … Topological insulator laser: rate-equation model. The topological insulator laser, considered in [7,8], is obtained byinsertingopticalgaininthe microringsatthe perimeter P of the square lattice and optical loss in the inner mi-crorings to facilitate oscillation in the edge supermodes. 2021-2-10 2021-4-14 · 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.
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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%.

elements in a spintronic Heusler material via femtosecond laser excitation. antiferromagnetism at the verge of the insulator-metal transition in doped LaFeO3.
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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

Scientists and engineers have created the first electrically-driven 'topological' laser, which has the ability to route light particles around corners -- and to cope with defects in the Studies on three dimensional topological insulators (TIs) such as Bi 2 Te 3, Bi 2 Se 3, and Sb 2 Te 3 over the past decade have been intense due to their unique physical properties and potential applications for spintronics and quantum computing. 1–6 1. M. Z. Hasan and C. L. Kane, “ Colloquium: Topological insulators,” Rev. Mod. Phys. 82 Here, all‐dielectric layered photonic topological insulators based on bilayer photonic crystal slabs are reported. The introduction of layer pseudospin offers more dispersion engineering capability, leading to the layer‐polarized and layer‐mixed photonic topological insulators. Recently, researchers developed a topological laser device with promising power efficiency and robustness to fabrication faults. Here, for the first time, we theoretically study the coherence properties of this class of devices and show that the new laser’s coherence can compete with traditional ones and that the device displays improved resilience to the defects of the optical lattice.

Here we demonstrate a nonmagnetic topological insulator laser system exhibiting topologically protected transport in the cavity. Its topological properties give rise to single-mode lasing, robustness against defects, and considerably higher slope efficiencies compared to the topologically trivial counterparts.

The topological insulator laser, considered in [7,8], is obtained byinsertingopticalgaininthe microringsatthe perimeter P of the square lattice and optical loss in the inner mi-crorings to facilitate oscillation in the edge supermodes. Outcoupling is assumed at the edge microring at site “This new laser system went against all common knowledge about topological insulators,” said Prof. Segev. “In a nut shell, the unique robustness properties of topological insulators were believed to fail when the system contains gain, as all lasers must have. Topological insulators (TIs) have unique highly conducting symmetry-protected surface states while the bulk is insulating, making them attractive for various applications in condensed matter physics. Recently, topological insulator materials have been tentatively applied for both near- and far-field wavefront manipulation of electromagnetic waves, yielding superior plasmonic properties in the Figure 1: Topological insulators in a nut shell. (a) Topological insulator: a two-dimensional (2D) material that is insulating in the bulk but exhibits perfect conduction on the edge.

Here, for the first time, we theoretically study the coherence properties of this class of devices and show that the new laser’s coherence can compete with traditional ones and that the device displays improved resilience to the defects of the optical lattice. We propose a system that exploits the fundamental features of topological photonics and synthetic dimensions to force many semiconductor laser resonators to synchronize, mutually lock, and under suitable modulation emit a train of transform-limited mode-locked pulses. These lasers exploit the Floquet topological edge states in a 1D array of ring resonators, which corresponds to a 2D 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 Topological Trivial 1550 1552 1554 1556 1558 1560 Wavelength [nm] 0 0.2 0.4 0.6 0.8 1 Spectrum [au] Topological Trivial Topological Lasing Mode Topological Photonics Meets Lasers T opological insulators represent a new phase of matt er: insulating in bulk, but with a robust edge conductance. These topo-logical edge states are extremely robust, show A new hands-off probe uses light to explore electron behavior in a topological insulator Just as pressing a guitar string produces a higher pitch, sending laser light through a material can shift anomalous topological insulators,19,20 topologically protected path entanglements,34 unpaired Dirac cones,35 topological edge states in quasicrystals,21 solitons,36–38 topological Anderson insulator,22,39,40 topological phases in synthetic dimensions,24 guiding light by artifi-cial gauge fields,41 and others. Note that driven topological systems, This Conference Presentation, Towards electrically pumped topological insulator lasers was recorded at Photonics West 2020 held in San Francisco, California, United States. Conference Presentation This content is available for download via your institution's subscription.