Lasing threshold
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Topological insulator laser: Experiments Open
Topological protection for lasers Ideas based on topology, initially developed in mathematics to describe the properties of geometric space under deformations, are now finding application in materials, electronics, and optics. The main dri…
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Subwavelength dielectric resonators for nonlinear nanophotonics Open
Enhancing optical nonlinearity Intense pulses of light interacting with a dielectric material can induce optical nonlinear behavior, whereby the frequency of the output light can be doubled or tripled or excited to even higher harmonics of…
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Lasing in robust cesium lead halide perovskite nanowires Open
Significance Nanowire lasers are miniaturized light sources with great potential for integration into optoelectronic circuits. Many of the current nanowire lasers either require extreme conditions for synthesis or suffer from poor operatio…
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Ultrafast control of vortex microlasers Open
Ultrafast vortex microlasers For applications in ultrafast communication, all-optical switches will require low energy consumption, high speed, a strong modulation ratio, a small footprint, and on-chip integration. Although the small footp…
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Nonreciprocal lasing in topological cavities of arbitrary geometries Open
Topological lasing Resonant cavities that confine light are crucial components of lasers. Typically, these cavities are designed to high specification to get the best possible output. That, however, can limit their integration into photoni…
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Organic Lasers: Recent Developments on Materials, Device Geometries, and Fabrication Techniques Open
Organic dyes have been used as gain medium for lasers since the 1960s, long before the advent of today's organic electronic devices. Organic gain materials are highly attractive for lasing due to their chemical tunability and large stimula…
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High‐Quality Whispering‐Gallery‐Mode Lasing from Cesium Lead Halide Perovskite Nanoplatelets Open
Semiconductor micro/nano‐cavities with high quality factor (Q) and small modal volume provide critical platforms for exploring strong light‐matter interactions and quantum optics, enabling further development of coherent and quantum photon…
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Nonlinear optical properties, upconversion and lasing in metal–organic frameworks Open
The building block modular approach that lies behind coordination polymers (CPs) and metal–organic frameworks (MOFs) results not only in a plethora of materials that can be obtained but also in a vast array of nonlinear optical properties …
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Chiral modes and directional lasing at exceptional points Open
Significance Exceptional points (EPs) emerge when a system with loss or gain is tuned such that its eigenvalues and the corresponding eigenstates coalesce. By operating close to two EPs, we achieved a dynamic control of the rotation direct…
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Real-Time Observation of the Buildup of Soliton Molecules Open
Real-time spectroscopy access to ultrafast fiber lasers opens new opportunities for exploring complex soliton interaction dynamics. Here, we have reported the first observation, to the best of our knowledge, of the entire buildup process o…
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Edge-Mode Lasing in 1D Topological Active Arrays Open
We report the first observation of lasing in topological edge states in a 1D Su-Schrieffer-Heeger active array of resonators. We show that in the presence of chiral-time ($\mathcal{CT}$) symmetry, this non-Hermitian topological structure c…
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Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications Open
Lead halide perovskite nanocrystals (NCs) are receiving a lot of attention nowadays, due to their exceptionally high photoluminescence quantum yields reaching almost 100% and tunability of their optical band gap over the entire visible spe…
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Nanowire Lasers of Formamidinium Lead Halide Perovskites and Their Stabilized Alloys with Improved Stability Open
The excellent intrinsic optoelectronic properties of methylammonium lead halide perovskites (MAPbX3, X = Br, I), such as high photoluminescence quantum efficiency, long carrier lifetime, and high gain coupled with the facile solution growt…
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Room-Temperature Polariton Lasing in All-Inorganic Perovskite Nanoplatelets Open
Polariton lasing is the coherent emission arising from a macroscopic polariton condensate first proposed in 1996. Over the past two decades, polariton lasing has been demonstrated in a few inorganic and organic semiconductors in both low a…
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Lead-Free Halide Double Perovskite Materials: A New Superstar Toward Green and Stable Optoelectronic Applications Open
Lead-based halide perovskites have emerged as excellent semiconductors for a broad range of optoelectronic applications, such as photovoltaics, lighting, lasing and photon detection. However, toxicity of lead and poor stability still repre…
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Ultralow-threshold laser using super-bound states in the continuum Open
Wavelength-scale lasers provide promising applications through low power consumption requiring for optical cavities with increased quality factors. Cavity radiative losses can be suppressed strongly in the regime of optical bound states in…
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Recent advances on optical vortex generation Open
This article reviews recent progress leading to the generation of optical vortex beams. After introducing the basics of optical vortex beams and their promising applications, we summarized different approaches for optical vortex generation…
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Bright Blue and Green Luminescence of Sb(III) in Double Perovskite Cs<sub>2</sub>MInCl<sub>6</sub> (M = Na, K) Matrices Open
The vast structural and compositional space of metal halides has recently become a major research focus for designing inexpensive and versatile light sources; in particular, for applications in displays, solid-state lighting, lasing, etc. …
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Symmetry‐Protected Dual Bound States in the Continuum in Metamaterials Open
Bound state in the continuum (BIC) is a mathematical concept with an infinite radiative quality factor ( Q ) that exists only in an ideal infinite array of resonators. In photonics, it is essential to achieve high Q resonances for enhanced…
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Frontiers of Mid-IR Lasers Based on Transition Metal Doped Chalcogenides Open
Enabling broad tunability, high peak and average power, ultrashort pulse duration, and all known modes of laser operation-transition-metal (TM)-doped II-VI chalcogenides are the materials of choice for direct lasing in the mid-IR. The host…
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A 271.8 nm deep-ultraviolet laser diode for room temperature operation Open
We present a deep-ultraviolet semiconductor laser diode that operates under current injection at room temperature and at a very short wavelength. The laser structure was grown on the (0001) face of a single-crystal aluminum nitride substra…
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Ten years of spasers and plasmonic nanolasers Open
Ten years ago, three teams experimentally demonstrated the first spasers, or plasmonic nanolasers, after the spaser concept was first proposed theoretically in 2003. An overview of the significant progress achieved over the last 10 years i…
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Solution‐Processed Low Threshold Vertical Cavity Surface Emitting Lasers from All‐Inorganic Perovskite Nanocrystals Open
Recently, newly engineered all‐inorganic cesium lead halide perovskite nanocrystals (IPNCs) (CsPbX 3 , X = Cl, Br, I) are discovered to possess superior optical gain properties appealing for solution‐processed cost‐effective lasers. Yet, t…
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Indication of current-injection lasing from an organic semiconductor Open
In this study, we investigate the lasing properties of 4,4′-bis[( N -carbazole)styryl]biphenyl thin films under electrical pumping. The electroluminescent devices incorporate a mixed-order distributed feedback SiO 2 grating into an organic…
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Enhanced Second-Harmonic Generation Using Broken Symmetry III–V Semiconductor Fano Metasurfaces Open
All-dielectric metasurfaces, two-dimensional arrays of subwavelength low loss dielectric inclusions, can be used not only to control the amplitude and phase of optical beams, but also to generate new wavelengths through enhanced nonlinear …
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Solution‐Processed Tin‐Based Perovskite for Near‐Infrared Lasing Open
The family of solution-processed tin-based perovskites is demonstrated as a new and superior near-infrared gain medium. Due to the large electron-hole bimolecular recombination associated with tin and the reduced trap density with SnF2 tre…
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Bound states in the continuum in resonant nanostructures: an overview of engineered materials for tailored applications Open
From theoretical model to experimental realization, the bound state in the continuum (BIC) is an emerging area of research interest in the last decade. In the initial years, well-established theoretical frameworks explained the underlying …
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How lasing happens in CsPbBr3 perovskite nanowires Open
Lead halide perovskites are emerging as an excellent material platform for optoelectronic processes. There have been extensive discussions on lasing, polariton formation, and nonlinear processes in this material system, but the underlying …
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Advances in Functional Solution Processed Planar 1D Photonic Crystals Open
An overview on the properties and applications of polymer and inorganic planar 1D photonic crystals fabricated from solution is provided here. In the last decades, photonic crystals became technologically relevant for light management, pho…
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An exciton-polariton laser based on biologically produced fluorescent protein Open
Microcavities filled with biologically produced green fluorescent protein show polariton condensation at room temperature.