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Intermolecular vibrational energy transfer enabled by microcavity strong lighta??matter coupling
摘要： Selective vibrational energy transfer between molecules in the liquid phase, a difficult process hampered by weak intermolecular forces, is achieved through polaritons formed by strong coupling between cavity photon modes and donor and acceptor molecules. Using pump-probe and two-dimensional infrared spectroscopy, we found that the excitation of the upper polariton, which is composed mostly of donors, can efficiently relax to the acceptors within ~5 picoseconds. The energy-transfer efficiency can be further enhanced by increasing the cavity lifetime, suggesting that the energy transfer is a polaritonic process. This vibrational energy-transfer pathway opens doors for applications in remote chemistry, sensing mechanisms, and vibrational polariton condensation.
关键词： intermolecular interactions,strong light–matter coupling,polaritons,microcavity,vibrational energy transfer
更新于2025-09-23 15:21:01
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Spatio-temporal coherence in vertically emitting GaAs-based electrically driven polariton lasers
摘要： We report on the implementation of a GaAs-based, vertically emitting electrically pumped polariton laser operated at cryogenic temperatures. The structure consists of a high quality factor AlGaAs/AlAs microcavity (Q ? 15 000) with two stacks of four GaAs quantum wells and features a Rabi splitting of 11 meV. Polariton lasing manifests by a clear threshold in the input–output characteristics of our device with a sharp drop in the emission linewidth and a continuous blueshift of 0.7 meV above threshold with increasing injection current. We measure spatial and temporal coherence of our device in the condensed phase by utilizing interference spectroscopy. Our results clearly demonstrate that electrically driven polariton lasers have promise as monolithic polaritonic sources of coherent light.
关键词： electrically pumped polariton laser,Rabi splitting,coherence,GaAs-based,microcavity
更新于2025-09-23 15:21:01
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Recent Progress of Strong Exciton-Photon Coupling in Lead Halide Perovskites
摘要： The semiconductor exciton–polariton, arising from the strong coupling between excitons and confined cavity photon modes, is not only of fundamental importance in macroscopic quantum effects but also has wide application prospects in ultralow-threshold polariton lasers, slowing-light devices, and quantum light sources. Very recently, metallic halide perovskites have been considered as a great candidate for exciton–polariton devices owing to their low-cost fabrication, large exciton oscillator strength, and binding energy. Herein, the latest progress in exciton–polaritons and polariton lasers of perovskites are reviewed. Polaritons in planar and nanowires Fabry–Pérot microcavities are discussed with particular reference to material and photophysics. Finally, a perspective on the remaining challenges in perovskite polaritons research is given.
关键词： exciton–polariton,low threshold laser,lead halide perovskite,optical microcavity,strong light–matter interaction
更新于2025-09-23 15:21:01
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Confined whispering-gallery mode in silica double-toroid microcavities for optical sensing and trapping
摘要： We propose and theoretically study a silica double-toroid microcavity to confine the whispering-gallery mode (WGM) in an ultra-small space, which consists of two toroid-to-toroid coupled cavities separated by a nanoscale gap region with low refractive index, such as the air gap. Benefitting from the strong field localization of the “slot” effect, power enhancement of symmetric WGMs in the gap results in the ultra-small mode volume of 4.8 μm3, which is quite smaller than the conventional toroidal microcavity with mode volume of about hundreds of cubic micrometers. The confined modes hold the potential advantages over conventional photonic devices, especially in the applications of the sensing and optical trapping. In the application of refractometer, a high refractive index sensitivity of up to 468 nm per refractive index unit (nm/RIU) can be obtained in the 1000 nm wavelength band. In the optical trapping application, the double-toroid microcavity enables a significant field enhancement in the confined WGM, and the gradient force could reach as high as 22 pN/W for a single nanoparticle with the radius of 5 nm. As the potential advantages, this study of silica double-toroid microcavity provides a good reference for realizing the high-efficient photonic applications such as optical sensing and trapping.
关键词： optical sensing,refractometer,silica double-toroid microcavity,gradient force,optical trapping,whispering-gallery mode
更新于2025-09-23 15:21:01
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Memory characteristics of microcavity dielectric barrier discharge
摘要： The nonlinear resistance characteristics of microcavity dielectric barrier discharge are mainly studied in the paper. A simulation model of microcavity dielectric barrier discharge is herein built to study the relationship between voltage and current in the process of discharge, and thus its I–V characteristic curve can be obtained. The I–V characteristics of the memristor are analyzed and compared with the I–V characteristics of the dielectric barrier discharge; it can be found that the I–V characteristics of the microcavity dielectric barrier discharge are similar to the characteristics of the memristor by analyzing them. The memory characteristics of microcavity dielectric barrier discharge are further analyzed.
关键词： memristor,memory characteristics,microcavity dielectric barrier discharge,I–V characteristic
更新于2025-09-23 15:21:01
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A Sharply Bent Waveguide with a Microcavity Constructed by an Air-Bridge Type Two-Dimensional Photonic Crystal Slab
摘要： An e?cient sharply bent waveguide with a microcavity constructed by an air-bridge type two-dimensional photonic crystal slab is analyzed. The method of solution is the three-dimensional ?nite di?erence time domain (FD-TD) method. The bent waveguide has a microcavity structure that connects to an input and an output waveguide ports. The radius and position of air-holes surrounding the microcavity are modi?ed to adjust the resonant frequency to the single-mode regime of the waveguides. It is con?rmed that input optical power is transmitted e?ciently to the output waveguide due to resonant tunneling caused by the microcavity.
关键词： FD-TD method,bent waveguide,microcavity,photonic crystal waveguide
更新于2025-09-23 15:19:57
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Microcavity Nonlinear Optics with an Organically Functionalized Surface
摘要： We report enhanced optical nonlinear effects at the surface of an ultrahigh-Q silica microcavity functionalized by a thin layer of organic molecules. The maximal conversion efficiency of third harmonic generation reaches ～1680%=W2 and an absolute efficiency of 0.0144% at pump power of ～2.90 mW, which is approximately 4 orders of magnitude higher than that in a reported silica microcavity. Further analysis clarifies the elusive dependence of the third harmonic signal on the pump power in previous literature. Molecule-functionalized microcavities may find promising applications in high-efficiency broadband optical frequency conversion and offer potential in sensitive surface analysis.
关键词： Nonlinear Optics,Microcavity,Third Harmonic Generation,Surface Functionalization,Organic Molecules
更新于2025-09-23 15:19:57
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Externally controlled Lotka-Volterra dynamics in a linearly polarized polariton fluid
摘要： Spontaneous formation of transverse patterns is ubiquitous in nonlinear dynamical systems of all kinds. An aspect of particular interest is the active control of such patterns. In nonlinear optical systems this can be used for all-optical switching with transistorlike performance, for example, realized with polaritons in a planar quantum-well semiconductor microcavity. Here we focus on a specific configuration which takes advantage of the intricate polarization dependencies in the interacting optically driven polariton system. Besides detailed numerical simulations of the coupled light-field exciton dynamics, in the present paper we focus on the derivation of a simplified population competition model giving detailed insight into the underlying mechanisms from a nonlinear dynamical systems perspective. We show that such a model takes the form of a generalized Lotka-Volterra system for two competing populations explicitly including a source term that enables external control. We present a comprehensive analysis of both the existence and stability of stationary states in the parameter space spanned by spatial anisotropy and external control strength. We also construct phase boundaries in nontrivial regions and characterize emerging bifurcations. The population competition model reproduces all key features of the switching observed in full numerical simulations of the rather complex semiconductor system and at the same time is simple enough for a fully analytical understanding.
关键词： all-optical switching,population competition model,nonlinear optical systems,transverse patterns,Lotka-Volterra system,polaritons,semiconductor microcavity
更新于2025-09-23 15:19:57
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Pure Metal-Organic Framework Microlasers with Controlled Cavity Shapes
摘要： Metal-organic frameworks (MOF) are an emerging kind of laser material, yet remains a challenge in the controlled fabrication of crystal nanostructures with desired morphology for tuning their optical microcavities. Herein, the shape-engineering of pure MOF microlasers was demonstrated based on the coordination mode-tailored method. The one-dimensional (1D) microwires and 2D microplates were selectively fabricated through changing the HCl concentration to tailor the coordination modes. Both the single-crystalline microwires and microplates with strong optical confinement functioned as low-threshold MOF microlasers. Moreover, distinct lasing behaviors of 1D and 2D MOF microcrystals confirm a typical shape-dependent microcavity effect: 1D microwires serve as Fabry-Pérot (FP) resonators, and 2D microplates lead to the whispering-gallery-mode (WGM) microcavities. These results provide a special pathway for the exploitation of MOF-based micro/nanolasers with on-demand functions.
关键词： metal-organic framework,microcavity effect,microlasers,nanophotonics
更新于2025-09-23 15:19:57
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Red, Green, and Blue Microcavity Quantum Dot Light-Emitting Devices with Narrow Line Widths
摘要： Colloidal quantum dots (QDs) are tiny particles produced chemically from semiconductor materials with sizes below 100 nm. Because of the quantum size effect, QDs have very unique luminescent properties. Based on these light emitters, quantum dot light-emitting diodes (QLEDs) exhibit outstanding electroluminescence (EL) performances and they are promising for application in displays, light sources and quantum-optoelectronic technologies. One of the greatest challenges in QLEDs is their low light outcoupling efficiency due to their planar structure, which limits the external quantum ef?ciency (EQE) of QLEDs for commercial applications. Here, we report the development of a set of red, green, and blue QLEDs with high EQE by incorporating microcavity structure in the devices. These microcavity devices exhibit modified EL spectra with full width at half maximum of 12-14 nm. Red, green, and blue microcavity QLEDs show maximum current efficiency and maximum EQE of 96.5 cd·A-1 and 33.1%, 102 cd·A-1 and 24.7%, and 2.91 cd·A-1 and 11.2%, respectively. We anticipate that a suitable design of a microcavity combining superior QDs will lead to excellent EL performance of QLEDs for displays, ideal QLED-based single-photon sources for quantum information technology, and electrically pumped QD lasers.
关键词： EQE,narrow linewidth,QLED,quantum dot,microcavity,electroluminescence
更新于2025-09-23 15:19:57