Optical second and third harmonic generation on excitons in ZnSe/BeTe quantum wells

Optical harmonic generation on the exciton-polariton in ZnSe

We study optical harmonic generation on the 1S exciton-polariton in the semiconductor ZnSe. Intense and spectrally narrow exciton resonances are found in optical second (SHG), third (THG), and fourth (FHG) harmonic generation spectra. The resonances are shifted to higher energy by 3.2 meV from the exciton energy in the linear reflectivity spectrum. Additional resonances are observed in the THG and FHG spectra and assigned to combinations of incident and backscattered photons in the crystal. Rotational anisotropy diagrams are measured and further information on the origin of the optical harmoni…

基于ZnSe微腔的激子-光子耦合

Exciton-photon coupling in a ZnSe based microcavity fabricated using epitaxial liftoff

我们报道了在用外延剥离法制作的ZnSe基微腔中观察到的强激子-光子耦合。将分子束外延生长的ZnSe/Zn $_{0.9}$ Cd $_{0.1}$ Se量子阱（在激子发射处具有一个波长的光学长度）转移到反射率为96%的SiO $_2$ /Ta $_2$ O $_5$镜上以形成精细匹配的微腔。我们的角度分辨透射光谱的分析揭示了强耦合制度的关键特征：在$20 K$的$23.6 meV$的正常模式分裂的反交叉;复合演化的下部和上部极化激元;和共振附近的下部极化激元线宽变窄。每个量子阱的重空穴激子振子强度也被推导为$1.78 \times 10^{13} cm^{-2}$。

Single quantum emitters with spin ground states based on Cl bound excitons in ZnSe

Defects in wide-bandgap semiconductors are promising qubit candidates for quantum communication and computation. Epitaxially grown II-VI semiconductors are particularly promising host materials due to their direct bandgap and potential for isotopic purification to a spin-zero nuclear background. Here, we show a new type of single photon emitter with potential electron spin qubit based on Cl impurities in ZnSe. We utilize a quantum well to increase the binding energies of donor emission and confirm single photon emission with short radiative lifetimes of 192 ps. Furthermore, we verify that the …

Efficient, Spectrally Tunable Single-Photon Sources Based on Chlorine-Doped ZnSe Nanopillars

Isolated impurity states in epitaxially grown semiconductor systems possess important radiative features such as distinct wavelength emission with a very short radiative lifetime and low inhomogeneous broadening which makes them promising for the generation of indistinguishable single photons. In this study, we investigate chlorine-doped ZnSe/ZnMgSe quantum well (QW) nanopillar (NP) structures as a highly efficient solid-state single-photon source operating at cryogenic temperatures. We show that single photons are generated due to the radiative recombination of excitons bound to neutral Cl at…

单个杂质束缚激子的腔增强单光子发射

Cavity-enhanced single photon emission from a single impurity-bound exciton

本研究针对ZnSe量子阱中杂质束缚激子单光子发射体的效率提升需求，采用优化的牛眼腔结构实现腔增强发射，亮度提升超一个量级，验证了单光子特性并测得Purcell因子1.43，为高效自旋-光子界面研究铺路。

利用时间相关光子检测InAs/ZnSe量子点固体中的 heralded 发射

Heralded Emission Detection in InAs/ZnSe Quantum Dot Solids Using Time-Correlated Photons

本研究利用超导纳米线单光子探测器和大面积光电二极管，在低温下实现InAs/ZnSe量子点固体的 heralded 发射检测，揭示了激子寿命和精细结构能级分裂，为量子光谱学提供了新的研究平台。