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摘要

Recent experiments demonstrated that chiral symmetry breaking at an exceptional point (EP) is a viable route to achieve unidirectional laser emission in microring lasers. By a detailed semiconductor laser rate equation model, we show here that unidirectional laser emission at an EP is a robust regime. Slight deviations from the EP condition can break preferential unidirectional

PDF全文 Photonics Research | 2017,5(06):B1
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摘要

We report on the operation of passively Q-switched waveguide lasers at 1 μm wavelength based on a graphene/WS2 heterostructure as a saturable absorber (SA). The gain medium is a crystalline Nd:YVO4 cladding waveguide produced by femtosecond laser writing. The nanosecond waveguide laser operation at 1064 nm has been realized with the maximum average output power of 275 mW and s

PDF全文 Photonics Research | 2017,5(05):406
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摘要

Optical whispering gallery microcavities with high-quality factors have shown great potential toward achieveing ultrahigh-sensitivity sensing up to a single molecule or nanoparticle, which raises a huge demand on a deep theoretical insight into the crucial phenomena such as the mode shift, mode splitting, and mode broadening in sensing experiments. Here we propose an intuitive

PDF全文 Photonics Research | 2017,5(05):396
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摘要

An all-fiber acousto-optic modulator (AOM), which features a compact structure and a low-driving voltage, is experimentally demonstrated for the active mode-locking of a fiber laser. The proposed AOM is based on the short length of the cladding-etched fiber, the ends of which are fixed on a slide glass. On top of the cladding-etched fiber, a piezoelectric transducer was overlai

PDF全文 Photonics Research | 2017,5(05):391
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摘要

Magnetoplasmonic sensors are attractive candidates for ultrasensitive chemical and biomedical sensor applications. A variety of ferromagnetic metal thin films have been used for magnetoplasmonic device applications, yet the dependence of sensor performance on the optical and magneto-optical properties of ferromagnetic metal materials has been rarely studied. In this work, we re

PDF全文 Photonics Research | 2017,5(05):385
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摘要

We report on a quantum dot quantum cascade detector (QD-QCD), whose structure is derived from a QD cascade laser. In this structure, more ordered InAs QD layers formed in the Stranski–Krastanow growth mode on a thin GaAs buffer layer are incorporated into the active region. This QD-QCD can operate up to room temperature with a peak detection wavelength of 5.8 μm. A responsivi

PDF全文 Chinese Optics Letters | 2017,15(10):102301
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摘要

Photoacoustic tomography (PAT) has the unique capability of visualizing optical absorption inside several centimeters-deep biological tissue with a high spatial resolution. However, single linear-array transducer-based PAT suffers from the limited-view challenge, and thus the synthetic aperture configuration is designed that still requires multichannel data acquisition hardware

PDF全文 Chinese Optics Letters | 2017,15(10):101102
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0 11 37

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We report a new application of optical coherence tomography (OCT) to investigate the cranial meninges in an animal model of brain injury in vivo. The injury is induced in a mouse due to skull thinning, in which the repeated and excessive drilling exerts mechanical stress on the mouse brain through the skull, resulting in acute and mild brain injury. Transcranial OCT imaging rev

PDF全文 Chinese Optics Letters | 2017,15(09):090005
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摘要

提出了一种新型金属-绝缘体-半导体(MIS)混合表面等离子体结构,基于时域有限差 分法验证了该结构在归一化频率范围(0.243~0.271)a/λ内具有明显的TM模式带隙。在二维光子晶体层 移除或改变中间行空气孔半径构成线缺陷,形成混合波导结构1和2。分析表明入射光频率位于 带隙内的光子能量被很好地局域在低折射率层中,且只能沿线缺陷传输。当入射波长为1550 nm时,两 种波导的传输距离分别为18.41 μm、15.70 μm, 群

PDF全文 量子电子学报 | 2017,34(04):507
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摘要

针对当前LTE网络数据传输优化算法对信道转移判断效率低、带宽占用率高、难以提升数据 传输质量等不足,提出了一种新的LTE网络数据传输优化算法。基于时分多址(TDMA)控制技术,结 合马尔科夫信道转移模型优化了信道带宽偏移轨迹;通过获取激发态-非激发态信道转移概率构建了 起伏追踪机制,对信道转移时的起伏特性进行筛选。仿真结果表明:与当前LTE网络数据传输中常 用的混频载波带通过滤算法、窄带噪声调整自适应

PDF全文 量子电子学报 | 2017,34(04):499
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