- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Enhancing the Speed and Sensitivity of a Nonlinear Optical Sensor with Noise
摘要： We demonstrate how noise can be turned into a resource for optical sensing using a nonlinear cavity. The cavity is driven by a continuous-wave laser into the regime of optical bistability. Due to the influence of fluctuations, the cavity switches randomly between two metastable states. By analyzing the residence times in these two states, perturbations to the resonance frequency of the cavity can be detected. Here, such an analysis is presented as a function of the strength of the perturbation and of the noise. By increasing the standard deviation of the noise, we find that the detection speed increases monotonically while the sensitivity peaks at a finite value of the noise strength. Furthermore, we discuss how noise-assisted sensing can be optimized in state-of-the-art experimental platforms, relying solely on the minimum amount of noise present in the cavity due to its dissipation. These results open up new perspectives for the ultrafast detection of nanoparticles, contaminants, gases, or other perturbations to the resonance frequency of an optical resonator, at low powers and in noisy environments.
关键词： noise,residence times,nonlinear optical sensor,sensitivity,optical bistability,detection speed
更新于2025-09-23 15:19:57
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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) - Hybrid-Cavity Semiconductor Lasers for Single Mode Operation And Optical Signal Processing
摘要： Hybrid-cavity of a Fabry-Pérot (FP) cavity and a microcavity with the microcavity as a wavelength selective reflector are reported for realizing single mode semiconductor lasers. Mode coupling between a microcavity mode and a FP mode results in mode Q factor enhancement and stable single mode operation. Furthermore, optical bistability are realized in the hybrid lasers as the unbiased microcavity working as a saturable absorption. Two bistability regions are realized for the hybrid lasers around threshold current and above threshold with mode competition, and all-optical flip-flop is demonstrated.
关键词： Optical Bistability,Optical Microcavity,Semiconductor Lasers,Coupled Mode
更新于2025-09-16 10:30:52
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Monolithic Tunable InAs/InP Broadband Quantum-Dash Laser
摘要： A two-sectioned quantum dash laser structure based on an InAs/InP chirped active region medium is investigated as a monolithic broadband tunable laser. A thorough parametric analysis on the effect of three tuning parameters (viz. injection current, cavity length, absorber-to-device length ratio) on the optical power-injection current (L-I) and spectral characteristics, particularly wavelength tunability and bandwidth broadening, is performed. A total emission wavelength tunability of ～20 nm is demonstrated in the mid-L-band (～1600 to ～1620 nm) window and ～2 times enhancement in the 3dB bandwidth. Furthermore, optical bistability in the two-sectioned InAs/InP quantum-dash laser device is observed at near room temperature in the form of L-I curve hysteresis. Further investigation displayed a direct relation between the absorber length and the hysteresis loop width with a maximum value of ～40 mA is demonstrated; a potential platform in fast optical switching and modulation applications. Finally, the two-sectioned structure is also proposed and investigated as a monolithic two-segment contact spectrum shaper to manipulate the lasing spectrum pro?les to attain ?at tops and effectively increase the spectrum 3dB bandwidth. As such, a maximum 3dB bandwidth was able to be pushed up to ～20 nm from ～7 nm by proper tuning of the current density distribution across the two segments of the device.
关键词： optical bistability,tunable lasers,L-band lasers,Broadband lasers,quantum-dash lasers,multi-segment lasers,quantum-dot lasers,two-section lasers
更新于2025-09-16 10:30:52
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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) - New Molecular-Based Materials for Enabling Electro-Optical Bistability in the Silicon Photonics Platform
摘要： Electro-optical bistability is a functionality which can be crucial for a wide range of applications as it can enable non-volatile and ultra-low power switching performance. We investigate the integration of a molecular-based material presenting a Spin Crossover (SCO) effect in the silicon platform for enabling optical bistability. The SCO phenomenon involves a switching process between two molecular spin states. This spin transition comes along with a change in the optical refractive index that can be switched by different external stimuli such as a variation of temperature or light irradiation and which has a hysteretic behaviour. The SCO material can be synthetized as nanoparticles so that it can be easily integrated in the silicon platform and have the potential to allow switching at room temperature.
关键词： switching,molecular material,silicon photonics,optical bistability,non-volatile
更新于2025-09-12 10:27:22
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Optical bistability and multistability via both coherent and incoherent fields in a three-level system
摘要： We have investigated the optical bistability and multistability behaviors in a three-level V-type system via both coherent and incoherent fields inside a unidirectional ring cavity. We find that the appearance and disappearance of optical bistability (OB)/optical multistability (OM) can easily be controlled by adjusting systemic parameters. Our scheme opens up a new possibility for realizing transition from OB to OM or vice versa for potential applications in information networks and processing with increased capacity.
关键词： optical bistability,optical multistability,incoherent field
更新于2025-09-04 15:30:14
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Controllable optical bistability and multistability in asymmetric quantum wells via Fano-type interference
摘要： We theoretically investigate the hybrid absorptive-dispersive optical bistability (OB) and optical multistability (OM) behaviors induced by Fano-type interference in a four-subband asymmetric semiconductor double quantum wells (QWs) scheme driven by a degenerate probe field and a coherent coupling field. We show that the appearance or disappearance of OB can be controlled by modulating the strength of the Fano-type interference. We also present the threshold and hysteresis cycle of the OB can be controlled by adjusting the intensity of the coherent coupling field. Moreover, OB can be switched to OM by tuning the frequency detuning of the coherent coupling field or vice versa. This interesting scheme may provide guidance for technological applications in optoelectronics and solid-state quantum information science.
关键词： optical bistability,Fano-type interference,quantum wells
更新于2025-09-04 15:30:14