- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Slow and fast single photons from a quantum dot interacting with the excited state hyperfine structure of the Cesium D1-line
摘要： Hybrid interfaces between distinct quantum systems play a major role in the implementation of quantum networks. Quantum states have to be stored in memories to synchronize the photon arrival times for entanglement swapping by projective measurements in quantum repeaters or for entanglement purification. Here, we analyze the distortion of a single-photon wave packet propagating through a dispersive and absorptive medium with high spectral resolution. Single photons are generated from a single in(Ga)As quantum dot with its excitonic transition precisely set relative to the cesium D1 transition. the delay of spectral components of the single-photon wave packet with almost Fourier-limited width is investigated in detail with a 200 MHz narrow-band monolithic Fabry-Pérot resonator. Reflecting the excited state hyperfine structure of Cesium, “slow light” and “fast light” behavior is observed. As a step towards room-temperature alkali vapor memories, quantum dot photons are delayed for 5 ns by strong dispersion between the two 1.17 GHz hyperfine-split excited state transitions. Based on optical pumping on the hyperfine-split ground states, we propose a simple, all-optically controllable delay for synchronization of heralded narrow-band photons in a quantum network.
关键词： slow light,optical pumping,single-photon wave packet,quantum networks,quantum dot,cesium D1 transition,fast light,Fabry-Pérot resonator
更新于2025-09-16 10:30:52
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Improved spectral performance of fiber sensor using Brillouin slow light
摘要： combination with Brillouin slow light, the experimental results agree well with the theoretical prediction. We design a scheme that the spectral performance of a sensor can be improved by introducing a Brillouin slow light into it. The experimental results show that spectral sensitivity is enhanced by about 1.145 time.
关键词： fiber sensor,slow light,spectral sensitivity,stimulated Brillouin scattering
更新于2025-09-16 10:30:52
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Slow Light to Reduce the Energy Dissipation of Mach-Zehnder Modulators in Silicon Photonics
摘要： Integrated Mach-Zehnder (MZ) modulators are important components in silicon photonic devices that rely on a reverse-biased p-n junction to modulate the optical signal via a change of the waveguide refractive index. Reducing their energy consumption is a crucial step towards the application of silicon photonics, especially in connection with the growing traffic volumes in data centers. In this work, we combine band-edge slow light structures consisting of silicon grating waveguides with periodic (interlaced) p-n junctions to maximize spatial matching between the optical field mode and the depletion region of the p-n junction. The two effects together will result in an improved modulation efficiency, leading to a strongly reduced energy dissipation per bit.
关键词： Energy Dissipation,Silicon Photonics,Slow Light,Mach-Zehnder Modulators
更新于2025-09-16 10:30:52
-
Exploiting long-range disorder in slow-light photonic crystal waveguides
摘要： The interplay between order and disorder in photonic lattices opens up a wide range of novel optical scattering mechanisms, resonances, and applications that can be obscured by typical ordered design approaches to photonics. Striking examples include Anderson localization, random lasers, and visible light scattering in biophotonic structures such as butterfly wings. In this work, we present a profound example of light localization in photonic crystal waveguides by introducing long-range correlated disorder. Using a rigorous three-dimensional Bloch mode expansion technique, we demonstrate how inter-hole correlations have a negative contribution to the total out-of-plane radiative losses, leading to a pronounced enhancement of the quality factor, Q, and Q/V cavity figures of merit in the long-range correlation regime. Subsequently, the intensity fluctuations of the system are shown to globally increase with the correlation length, highlighting the non-trivial role of long-range disorder on the underlying scattering mechanisms. We also explore the possibility of creating ultra-high quality cavity modes via inter-hole correlations, which have various functionalities in chip-based nonlinear optics and waveguide cavity-quantum electrodynamics.
关键词： Long-Range Correlations,Photonic Crystal Waveguides,Slow Light,Disordered photonics,Anderson Localization
更新于2025-09-16 10:30:52
-
Fano resonance induced fast to slow light in a hybrid semiconductor quantum dot and metal nanoparticle system
摘要： We theoretically demonstrate the Fano resonance and the conversion from fast to slow light in a hybrid semiconductor quantum dot (SQDs)-metal nanoparticle (MNPs) with cavity quantum electrodynamics treatment. The absorption spectra of the weak probe field exhibit a series of asymmetric Fano line shapes and their related optical propagation properties, such as fast and slow light effects, are investigated based on the hybrid system for suitable parametric regimes. Further, the transparency windows (i.e. the absorption dip approaches zero) in the probe absorption spectra are accompanied by the rapid steep dispersion of the Fano resonance profile, which promises the slow or fast light effect, and even tunable fast-to-slow light propagation (or vice versa) can be achieved by controlling different parameter regimes. Therefore the investigation may indicate promising applications in quantum information processing based on the hybrid SQD-MNP system.
关键词： semiconductor quantum dots,cavity quantum electrodynamics (C-QED),metal nanoparticles,fast to slow light,Fano resonance
更新于2025-09-16 10:30:52
-
[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Wideband slow light in grating waveguides
摘要： In this work, a wide band slow light is achieved in a simple one-dimensional grating waveguide. A flat band indicating slow light with group index of 13 and bandwidth over 10nm is obtained.
关键词： grating waveguide,wideband,slow light
更新于2025-09-12 10:27:22
-
[IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Dual-band electromagnetically induced transparency effect in asymmetrically coupled terahertz metamaterials
摘要： In this article, we numerically and experimentally investigate a metamaterial geometry capable of exhibiting dual-band electromagnetic induced transparency (EIT) effect in terahertz frequency regime. The meta-molecule unit consists of two asymmetric C resonators, placed alternately on both sides of a cut-wire (CW). The near field coupling between the CW and C resonators of the MM structure leads to the evolution of the dual-band EIT effect. We observe that the dual-band EIT effect can be modulated by changing the distance between the CW and the 2C resonators. Our study can play an important role in the development of multi-band slow light devices, modulators and also for sensing applications.
关键词： sensing,modulators,slow light devices,metamaterials,dual-band electromagnetically induced transparency,terahertz
更新于2025-09-12 10:27:22
-
[IEEE 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS) - Seoul, Korea (South) (2019.1.27-2019.1.31)] 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS) - Engineering and Tuning of Slow Light in Mid-Infrared Silicon-on-Insulator Photonic Crystal Waveguides
摘要： We design, fabricate, and characterize slow light devices based on photonic crystal waveguides (PhCWs) in the mid-infrared wavelength range of 3.9-3.98 μm. Lattice shifting and thermo-optic tuning methods are employed to manipulate the slow light region for potential spectroscopy sensing applications. Up to 20 nm wavelength shift of the slow light band edge is demonstrated. Normalized delay-bandwidth products as high as 0.084-0.112 are obtained thanks to dispersion engineering. The slow light enhancement effect of thermo-optic tuning efficiency is verified by the proportional relationship between the phase shift and the group index. This work serves as a proof-of-concept that slow light effect can strengthen light-matter interaction and thereby improve device performance in sensing and nonlinearity applications.
关键词： thermo-optic tuning,slow light,mid-infrared,dispersion engineering,silicon-on-insulator,photonic crystal waveguides
更新于2025-09-12 10:27:22
-
Slow-Light Frequency Combs and Dissipative Kerr Solitons in Coupled-Cavity Waveguides
摘要： We study Kerr frequency combs and dissipative Kerr solitons in silicon photonic crystal coupled-cavity waveguides (CCWs) with globally optimized dispersion at telecom wavelengths. The corresponding threshold for comb generation is found to explicitly depend on the main CCW figures of merit, namely, the mode volume, the normal-mode quality factor, and the slow-light group index. Our analysis is carried out by solving the nonlinear dynamics of the CCW Bloch modes in the presence of Kerr nonlinearity and two-photon absorption. Our results open the way to CCW comb generation via dispersion engineering and slow-light enhancement.
关键词： dissipative Kerr solitons,silicon photonic crystal,dispersion engineering,slow-light enhancement,coupled-cavity waveguides,Kerr frequency combs
更新于2025-09-12 10:27:22
-
Triple mode coupling effect and dynamic tuning based on the zipper-type graphene terahertz metamaterial
摘要： We construct a laminated metamaterial structure of zipper-type monolayer graphene with silica which equipped with a distinctively dual plasmon induced transparency (PIT) phenomenon. The graphene pattern in this structure crafty connects with the electrode so that we can dynamically control the PIT response (via regulating the bias voltage that applied between the electrode and the substrate to control the graphene Fermi energy). In which, the range of voltage-regulate is calculated theoretically that proved to be a feasible measure for PIT response-tune. Then, the tuning discipline for this structure is summarized from the calculated result of coupled mode theory (CMT) deduced theoretical model and the simulation result. It is found that the structure possesses a great tuning performance within the tuning range we studied; also, such the structure ameliorates the monolayer graphene absorbance from 2.3% to about 50% within a broad dynamic frequency tuning range, the absorption peak frequency modulation depth is up to 45.46%. Besides, the group refractive index is discussed for reflecting the system capability of slow light, and the maximum of the coefficient can catch up to 595. Even if the impact of dielectric light- absorbance to slow light is taken into account, the slow light index at the transparent window is still as high as 200.
关键词： Absorbance,Plasmon induced transparency,Dynamic tuning,Slow light device,Graphene metamaterial
更新于2025-09-12 10:27:22