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- 实验方案
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GaAs Quantum Dot in a Parabolic Microcavity Tuned to <sup>87</sup> Rb D <sub/>1</sub>
摘要： We develop a structure to efficiently extract photons emitted by a GaAs quantum dot tuned to Rubidium. For this, we employ a broadband microcavity with a curved gold backside mirror which we fabricate by a combination of photoresist reflow, dry reactive ion etching in an inductively coupled plasma and selective wet chemical etching. Precise reflow and etching control allows us to achieve a parabolic backside mirror with a short focal distance of 265 nm. The fabricated structures yield a predicted (measured) collection efficiency of 63 % (12 %), an improvement by more than one order of magnitude compared to unprocessed samples. We then integrate our quantum dot parabolic microcavities onto a piezoelectric substrate capable of inducing a large in-plane biaxial strain. With this approach, we tune the emission wavelength by 0.5 nm/kV, in a dynamic, reversible and linear way, to the Rubidium D1 line (795 nm).
关键词： two-photon resonance fluorescence,strain tuning,microcavity,single-photon source,extraction efficiency,semiconductor quantum dots
更新于2025-09-12 10:27:22
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Mathematical and Numerical Modeling of On-Threshold Modes of 2-D Microcavity Lasers with Piercing Holes
摘要： This study considers the mathematical analysis framework aimed at the adequate description of the modes of lasers on the threshold of non-attenuated in time light emission. The lasers are viewed as open dielectric resonators equipped with active regions, ?lled in with gain material. We introduce a generalized complex-frequency eigenvalue problem for such cavities and prove important properties of the spectrum of its eigensolutions. This involves reduction of the problem to the set of the Muller boundary integral equations and their discretization with the Nystrom technique. Embedded into this general framework is the application-oriented lasing eigenvalue problem, where the real emission frequencies and the threshold gain values together form two-component eigenvalues. As an example of on-threshold mode study, we present numerical results related to the two-dimensional laser shaped as an active equilateral triangle with a round piercing hole. It is demonstrated that the threshold of lasing and the directivity of light emission, for each mode, can be e?ciently manipulated with the aid of the size and, especially, the placement of the piercing hole, while the frequency of emission remains largely intact.
关键词： Nystr?m method,active microcavity,eigenvalue problem,boundary integral equation,microcavity laser
更新于2025-09-11 14:15:04
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Mode and sensing properties of a silicon-based hybrid plasmonic microring resonator
摘要： A silicon-based hybrid plasmonic microring resonator consisting of a silicon-on-insulator ring which is separated from a silver nanoring by a low-permittivity dielectric is proposed for sensing applications. Benefitting from the hybrid modes and the circular-shaped cross section of nanoring, the hybrid microcavity can attract part of the cavity energy from the silicon ring microcavity, achieving high energy ratio and high refractive index sensitivity. The performance of the hybrid microcavity has been investigated by employing a finite element method and analyzed considering the different structure geometry, showing high quality factor of 1181, small mode volume of 0.154 lm3 and large refractive index sensitivity of 529.6 nm/RIU (refractive index unit). Thus, the presented silicon-based hybrid plasmonic microring resonator provides the potential applications in sensing at deep sub-wavelength scale.
关键词： Hybrid plasmonic mode,Quality factor,Effective mode volume,High sensitive sensor,Hybrid plasmonic microcavity
更新于2025-09-11 14:15:04
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Demonstration of polarization control GaN-based micro-cavity lasers using a rigid high-contrast grating reflector
摘要： We reported on Gan microcavity (Mc) lasers combined with one rigid tio2 high-contrast grating (HcG) structure as the output mirror. the HcG structure was directly fabricated on the Gan structure without an airgap. The entire MC structure comprised a bottom dielectric distributed Bragg reflector; a GaN cavity; and a top HCG reflector, which was designed to yield high reflectance for transverse magnetic (tM)- or transverse electric (te)-polarized light. the Mc device revealed an operation threshold of approximately 0.79 MW/cm2 when pulsed optical pumping was conducted using the HcG structure at room temperature. The laser emission was TM polarized with a degree of polarization of 99.2% and had a small divergence angle of 14° (full width at half maximum). This laser operation demonstration for the Gan-based Mc structure employing an HcG exhibited the advantages of HcGs in semiconductor lasers at wavelengths from green to ultraviolet.
关键词： Gan microcavity lasers,high-contrast grating reflector,GaN,polarization control,TiO2
更新于2025-09-11 14:15:04
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Thermally tunable and electrically switchable solid sphere shell three-layer 3D Bragg microcavity laser based on cholesteric-liquid-crystals
摘要： This letter reports a thermally tunable and electrically switchable three-layer 3D Bragg resonance cavity consisting of dye-doped cholesteric-liquid-crystal (DDCLC) microdroplet, polyglycerol-2 and hollow-glass-microsphere (HGM). The whispering-gallery-mode and photonic bandgap mode can be controlled by varying the CLC refractive indices in HGM. The effects of the temperature and electric field on the peaks wavelengths were studied. The study results present the prospect of thermally and electrically controlled the output mode of the microlaser and such solid shell tunable DDCLC microsphere lasers have an outstanding potential applications in integrated microlasers, tunable optical devices and highly sensitive sensor.
关键词： thermally tunable,cholesteric-liquid-crystals,electrically switchable,3D Bragg microcavity,microlaser
更新于2025-09-11 14:15:04
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[IEEE 2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France (2019.7.9-2019.7.13)] 2019 21st International Conference on Transparent Optical Networks (ICTON) - Microcavity-Enhanced Surface Nonlinear Optics
摘要： Confinement and manipulation of photons using microcavities have triggered intense research interest in both fundamental and applied photonics for decades. As a prominent example, whispering-gallery microcavities have ultrahigh Q factors and small mode volumes, making them promising candidates for enhancing light-matter interactions, especially for nonlinear optics. In this work, we report the second-order nonlinear optics induced by symmetry breaking at the surface of an ultrahigh-Q silica microcavity under a sub-milliwatt continuous-wave pump. By dynamically coordinating the double-resonance phase matching, a second harmonic is achieved with a co(cid:81)(cid:89)(cid:72)(cid:85)(cid:86)(cid:76)(cid:82)(cid:81)(cid:3)(cid:72)(cid:73)(cid:73)(cid:76)(cid:70)(cid:76)(cid:72)(cid:81)(cid:70)(cid:92)(cid:3)(cid:82)(cid:73)(cid:3)(cid:19)(cid:17)(cid:19)(cid:23)(cid:28)(cid:8)(cid:3031)(cid:58)-1, 14 orders of magnitude higher than that of the non-enhancement case.
关键词： nonlinear optics,symmetry breaking,microcavity,second harmonic generation,surface
更新于2025-09-11 14:15:04
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Influence of Annealing Temperature on Weak-Cavity Top-Emission Red Quantum Dot Light Emitting Diode
摘要： In this report, we show that the annealing temperature in QDs/Mg-doped ZnO film plays a very important role in determining QLEDs performance. Measurements of capacitance and single carrier device reveal that the change of the device efficiency with different annealing temperatures is related to the balance of both electron and hole injection. A comparison of annealing temperatures shows that the best performance is demonstrated with 150°C-annealing temperature. With the improved charge injection and charge balance, a maximum current efficiency of 24.81 cd/A and external quantum efficiency (EQE) of 20.09% are achievable in our red top-emission QLEDs with weak microcavity structure.
关键词： microcavity,QLEDs,top-emission
更新于2025-09-11 14:15:04
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Solid-state emitter embedded in a microcavity under intense excitation: A variational master-equation approach
摘要： In this work, dissipative effects from a phonon bath on the resonance ?uorescence of a solid-state two-level system embedded in a high-quality semiconductor microcavity and driven by an intense laser are investigated. Within the density operator formalism, we derive a variational master equation valid for broader ranges of temperatures, pumping rates, and radiation-matter couplings than previous studies. From the obtained master equation, ?uorescence spectra for various thermal and exciting conditions are numerically calculated and compared to those computed from weak coupling and polaronic master equations, respectively. Our results evidence the breakdown of those rougher approaches under increased temperature and strong pumping.
关键词： solid-state emitter,variational master equation,microcavity,phonon bath,resonance ?uorescence
更新于2025-09-11 14:15:04
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Interaction-induced photon blockade using an atomically thin mirror embedded in a microcavity
摘要： Narrow bright or dark resonances associated with electromagnetically induced transparency play a key role in enhancing photon-photon interactions. The schemes realized to date relied on the existence of long-lived atomic states with strong van der Waals interactions. Here, we show that by placing an atomically thin semiconductor with ultrafast radiative decay rate inside a microcavity, it is possible to obtain extremely narrow dark or bright resonances in transmission. While breaking of translational invariance sets a limit on the width of the dark resonance width, it is possible to obtain a narrow bright resonance that is much narrower than the cavity and bare exciton decay rates and is protected against disorder by tuning the cavity away from the excitonic transition. Resonant excitation of this bright resonance yields strong photon antibunching even in the limit where the interaction strength is arbitrarily smaller than the non-Markovian disorder broadening and the radiative linewidth of the bare exciton. Our findings suggest that atomically thin semiconductors which exhibit large exciton-cavity coupling and small nonradiative line broadening could pave the way for the realization of strongly interacting photonic systems in the solid state.
关键词： electromagnetically induced transparency,photon blockade,photon-photon interactions,microcavity,atomically thin semiconductor
更新于2025-09-10 09:29:36
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Photonic Microcavity-Enhanced Magnetic Plasmon Resonance of Metamaterials for Sensing Applications
摘要： We investigate photonic microcavity-enhanced magnetic plasmon (MP) resonance in metamaterials for high-quality refractive index sensing. The metamaterials are consisting of a top periodic array of U-shaped metallic split-ring resonators (SRRs), a middle dielectric layer, and a bottom metallic backed plate. The top metallic SRRs that are placed at about Bragg distance above the bottom metallic plate constitute a photonic microcavity. Because the MP resonance excited in metallic SRRs is coupled to the photonic microcavity mode supported by the photonic microcavity, the radiative damping of the MP resonance is strongly reduced and consequently its linewidth is decreased dramatically. Benefiting from the narrow linewidth, large modulation depth, and giant magnetic field enhancement at the MP resonance, the cavity-coupled metamaterial sensor has very high sensitivity (S =400 nm/RIU, S* =26/RIU) and figure of merit (FOM =33, FOM* =4215), which suggests that the proposed metamaterials have potential in applications of plasmonic biosensors.
关键词： Optical sensing and sensors,Narrow linewidth,Magnetic field enhancement,Photonic microcavity,Metamaterials
更新于2025-09-10 09:29:36