- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Nonlinear polaritons in a monolayer semiconductor coupled to optical bound states in the continuum
摘要： Optical bound states in the continuum (BICs) provide a way to engineer very narrow resonances in photonic crystals. The extended interaction time in these systems is particularly promising for the enhancement of nonlinear optical processes and the development of the next generation of active optical devices. However, the achievable interaction strength is limited by the purely photonic character of optical BICs. Here, we mix the optical BIC in a photonic crystal slab with excitons in the atomically thin semiconductor MoSe2 to form nonlinear exciton-polaritons with a Rabi splitting of 27 meV, exhibiting large interaction-induced spectral blueshifts. The asymptotic BIC-like suppression of polariton radiation into the far field toward the BIC wavevector, in combination with effective reduction of the excitonic disorder through motional narrowing, results in small polariton linewidths below 3 meV. Together with a strongly wavevector-dependent Q-factor, this provides for the enhancement and control of polariton–polariton interactions and the resulting nonlinear optical effects, paving the way toward tuneable BIC-based polaritonic devices for sensing, lasing, and nonlinear optics.
关键词： nonlinear exciton-polaritons,MoSe2,Rabi splitting,photonic crystal slab,Optical bound states in the continuum
更新于2025-09-19 17:13:59
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Optimal Photonic Crystal Cavities for Coupling Nanoemitters to Photonic Integrated Circuits
摘要： Photonic integrated circuits that are manufactured with mature semiconductor technology hold great promise for realizing scalable quantum technology. Efficient interfaces between quantum emitters and nanophotonic devices are crucial building blocks for such implementations on silicon chips. These interfaces can be realized as nanobeam optical cavities with high quality factors and wavelength-scale mode volumes, thus providing enhanced coupling between nano-scale quantum emitters and nanophotonic circuits. Realizing such resonant structures is particularly challenging for the visible wavelength range, where many of the currently considered quantum emitters operate, and if compatibility with modern semiconductor nanofabrication processes is desired. Here, it is shown that photonic crystal nanobeam cavities for the visible spectrum can be designed and fabricated directly on-substrate with high quality factors and small mode volumes. Designs are compared based on deterministic and mode-matching methods and the latter is found advantageous for on-substrate realizations. The results pave the way for integrating quantum emitters with nanophotonic circuits for applications in quantum technology.
关键词： CMOS compatible,photonic crystal cavities,integrated photonics,high quality factor
更新于2025-09-19 17:13:59
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[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) - Ultracompact add-drop filters based on single nanobeam cavity
摘要： Ultracompact filters using single nanobeam photonic crystal cavity are proposed, designed and experimentally demonstrated in this work. Transversely antisymmetric multimode nanobeam photonic crystal cavities are employed in the design to implement mode-selective waveguide-cavity coupling and achieve complete channel drop filtering function. Experimental results show the insertion loss of through port, drop port and the crosstalk of add port are -0.1 dB, -0.2 dB and -12.5 dB, respectively. The footprint of the involved nanobeam photonic crystal cavity is only 12 μm2 and indicating huge potentials in future VLSI photonics applications.
关键词： nanobeam photonic crystal cavities,asymmetric multimode periodic waveguides,ultracompact photonic devices,add-drop filters
更新于2025-09-16 10:30:52
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[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) - Low Loss Suspended Silicon Waveguide and Photonic Crystal for THz Regime
摘要： Terahertz integrated photonic circuits are used in many applications. In recent years we are witnessing an unprecedented development of applications of THz waves such as identifications of pollutants, safety imaging, high data transmission, detection of organic molecules in space… The majority of these systems however still rely on voluminous, free-space implementations necessitating powerful bulky THz sources and detectors. The development of a low-loss chip-scale integrated photonic platform for THz waves and the associated increased energy confinement could bring about a performance/cost ratio for these technologies. Up till now reports of integrated mm-wave and THz integrated circuits have been few and far between, hindered by important on-chip waveguide losses, and requiring important technological fabrication efforts [1], [2]. In this work we present experimental work on a low-loss and low-cost, suspended silicon waveguide technology at millimetric scale for THz frequencies. Specifically, we present loss extractions measured on waveguides of varying length and first results on integrated cavities, obtained by etching a 1D crystal in the suspended waveguide. These results prove versatility and viability of this new technological platform for integrated THz sensing and spectroscopy applications.
关键词： photonic crystal,integrated photonic circuits,silicon waveguide,Terahertz,low-loss
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Singapore, Singapore (2019.8.28-2019.8.30)] 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Temperature Characteristics of Photonic-Crystal Lasers Coupled to Si Waveguides
摘要： We experimentally investigated the temperature characteristics of photonic-crystal lasers coupled to Si waveguides. Output light was successfully coupled to the Si waveguides. The laser had a threshold current of 0.023 mA, and it operated at temperatures up to 63.9 degrees Celsius.
关键词： Si photonics,nanocavity laser,photonic crystal,semiconductor laser
更新于2025-09-16 10:30:52
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Selective Absorption of Photonic Crystal with Graphene
摘要： Selective absorption of photonic crystal with graphene is studied. The Photonic Crystal at THz regime with permittivity 4.2 is designed and validated with rigorous coupled-wave analysis method (RCWA) and finite element method (FEM). The selective absorption is achieved by combining the Photonic Crystal with Graphene. The selective absorption is explained with Fano resonance fitting method.
关键词： RCWA,FEM,THz,Selective absorption,Photonic crystal (PC),Graphene
更新于2025-09-16 10:30:52
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[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) - Numerical study on a proposed photonic crystal fiber with large modal separation
摘要： We investigate the characteristics of optical modes in a new designed hollow-core photonic crystal fiber (PCF), including the large effective refractive index difference between four vector beams and chromatic dispersion.
关键词： chromatic dispersion,Modal separation,effective refractive index,photonic crystal fiber
更新于2025-09-16 10:30:52
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[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) - Temperature Sensor Based on Mach-Zehnder Interferometer with Corroded Photonic Crystal Fiber
摘要： A temperature sensor by using a corroded photonic crystal fiber (PCF) based on Mach-Zehnder interferometer (MZI) is proposed and experimentally demonstrated. It fabricated by sandwiching a corroded PCF between two standard single mode fibers (SMFs) with the original region of the air holes of the PCF transforming into a hexagonal ring air cavity. The proposed sensor is linearly responsive to temperature within the range from 25°C to 100°C, with the sensitivity of 2.9 pm/°C, which makes it a highly promising for practical high temperature monitoring application.
关键词： Photonic crystal fiber,Temperature,Mach-Zehnder interferometer
更新于2025-09-16 10:30:52
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[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) - Design of a low-dispersion ring-core photonic crystal fiber supporting 26 OAM modes
摘要： We propose a new photonic crystal fiber structure to support 26 orbital angular momentum (OAM) modes from 1.25μm to 1.95μm. It has been proven that this fiber has good performance by the numerical analysis, such as low confinement loss, and relatively flat chromatic dispersion. The fiber has only two-layer of air holes, which makes it easier to be manufactured. What’s more, the fiber has a more stable physical structure, the triangular arrangement of air holes which can guarantee the air holes hardly deforms.
关键词： ring-core photonic crystal fiber,orbital angular momentum
更新于2025-09-16 10:30:52
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All polarization-maintaining passively mode-locked Yb-doped fiber laser: pulse compression using an anomalous polarization-maintaining photonic crystal fiber
摘要： We report the generation of short pulses at 1 μm using an all-polarization-maintaining (PM) fiber configuration. The pulses are provided by an all normal-dispersion Fabry-Perot Yb-doped cavity and are compressed with an anomalous polarization-maintaining photonic crystal fiber (PM PCF). Opposed to standard configurations; here the filtering action is solely performed by the finite bandwidth of the gain medium. The laser generates 8 ps width sech2 profile pulses at 1046.8 nm with a -10 dB bandwidth of 5.9 nm. After compression using the PM PCF, pulses with an FWHM of 3 ps were obtained, limited by the actual value of the available anomalous dispersion. We also report the changes in the output light pulses when both the net-normal dispersion of the cavity and the medium gain length were varied. We found that the lack of a specific filter within the cavity does not deteriorate the performance as compared with previous works.
关键词： dissipative solitons,photonic crystal fibers,fiber laser,polarization maintaining
更新于2025-09-16 10:30:52