“…1e , the mode family of a 2.5 μm micropillar with the planar cavity resonance at 920 nm is calculated by the finite difference time domain (FDTD) simulation with the insets representing the intensity profiles of a few representative modes. Among all the cavity modes, the fundamental mode HE 11 exhibits the highest Q-factor, lowest mode volume, and near Gaussian far-field pattern, which is widely used for building high-performance single-photon sources via the cavity QED effect 17 , 34 – 36 . Fig.…”
Optical microcavities have widely been employed to enhance either the optical excitation or the photon emission processes for boosting light-matter interactions at the nanoscale. When both the excitation and emission processes are simultaneously facilitated by the optical resonances provided by the microcavities, as referred to the dual-resonance condition in this article, the performances of many nanophotonic devices approach to the optima. In this work, we present versatile accessing of dual-resonance conditions in deterministically coupled quantum-dot (QD)-micropillars, which enables emission from neutral exciton (X)—charged exciton (CX) transition with improved single-photon purity. In addition, the rarely observed up-converted single-photon emission process is achieved under dual-resonance conditions. We further exploit the vectorial nature of the high-order cavity modes to significantly improve the excitation efficiency under the dual-resonance condition. The dual-resonance enhanced light-matter interactions in the quantum regime provide a viable path for developing integrated quantum photonic devices based on cavity quantum electrodynamics (QED) effect, e.g., highly efficient quantum light sources and quantum logical gates.
“…1e , the mode family of a 2.5 μm micropillar with the planar cavity resonance at 920 nm is calculated by the finite difference time domain (FDTD) simulation with the insets representing the intensity profiles of a few representative modes. Among all the cavity modes, the fundamental mode HE 11 exhibits the highest Q-factor, lowest mode volume, and near Gaussian far-field pattern, which is widely used for building high-performance single-photon sources via the cavity QED effect 17 , 34 – 36 . Fig.…”
Optical microcavities have widely been employed to enhance either the optical excitation or the photon emission processes for boosting light-matter interactions at the nanoscale. When both the excitation and emission processes are simultaneously facilitated by the optical resonances provided by the microcavities, as referred to the dual-resonance condition in this article, the performances of many nanophotonic devices approach to the optima. In this work, we present versatile accessing of dual-resonance conditions in deterministically coupled quantum-dot (QD)-micropillars, which enables emission from neutral exciton (X)—charged exciton (CX) transition with improved single-photon purity. In addition, the rarely observed up-converted single-photon emission process is achieved under dual-resonance conditions. We further exploit the vectorial nature of the high-order cavity modes to significantly improve the excitation efficiency under the dual-resonance condition. The dual-resonance enhanced light-matter interactions in the quantum regime provide a viable path for developing integrated quantum photonic devices based on cavity quantum electrodynamics (QED) effect, e.g., highly efficient quantum light sources and quantum logical gates.
“…The circular gratings operate under the second order Bragg condition and provide reflective feedback to the cavity, leading to near-vertical upward scattering of the photons, as schematically illustrated in Figure 2(a). Compared to the integrated photonic structures in literature [9,22,23,33], the CBRs are easy to fabricate and can simultaneously enhance the spontaneous emission rate and improve the emission directionality to the free-space over a broad bandwidth. To get a suitable dimension of the CBR, we first simulate the intrinsic optical properties of the CBR.…”
AbstractMonolayer transition metal dichalcogenides (TMDs) have emerged as a promising platform for chip-integrated optoelectronics and non-linear optics. Here, we demonstrate a two-dimensional (2D) monolayer tungsten disulfide (WS2) efficiently coupled to a dielectric circular Bragg resonator (CBR). The coupling of the WS2 and CBR leads to pronounced enhancements in both photoluminescence (PL) and second harmonic generation (SHG) by a factor of 34 and 5, respectively. Our work provides a powerful tool to enhance the interactions between light and the 2D materials, paving the way for efficient on-chip optoelectronic devices.
“…Moreover, one may want to take advantage of cavity QED effects, such as Purcell enhancement, which increases the radiative rate. Such tasks can be fulfilled by employing QD‐cavity systems operating in the weak coupling regime or coupling the emission from QDs into propagating optical modes in tailored waveguides [ 38,40,41,43,54,59,60 ] (for example, slow light photonic crystals), as summarized in Figure . In such cases, the precise location of the emitter within the electromagnetic field plays an important role.…”
Section: Applications Of Positioning Techniques In Quantum Photonicsmentioning
Deterministically integrating single solid‐state quantum emitters with photonic nanostructures serves as a key enabling resource in the context of photonic quantum technology. Due to the random spatial location of many widely‐used solid‐state quantum emitters, a number of positioning approaches for locating the quantum emitters before nanofabrication have been explored in the last decade. Here, the working principles of several nanoscale positioning methods and the most recent progress in this field, covering techniques including atomic force microscopy, scanning electron microscopy, confocal microscopy with in situ lithography, and wide‐field fluorescence imaging are reviewed. A selection of representative device demonstrations with high‐performance is presented, including high‐quality single‐photon sources, bright entangled‐photon pairs, strongly‐coupled cavity QED systems, and other emerging applications. The challenges in applying positioning techniques to different material systems and opportunities for using these approaches for realizing large‐scale quantum photonic devices are discussed.
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