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| 1 | High powerλ~8.5μm quantum cascade laser grown by MOCVD operating continuous-wave up to 408 K显示文摘Robust quantum cascade laser(QCL)enduring high temperature continuous-wave(CW)operation is of critical importance for some applications.We report on the realization of lattice-matched InGaAs/InAlAs/InP QCL materials grown by metal-organic chemical vapor deposition(MOCVD).High interface quality structures designed for light emission at 8.5μm are achieved by optimizing and precise controlling of growth conditions.A CW output power of 1.04 W at 288 K was obtained from a 4 mm-long and 10μm-wide coated laser.Corresponding maximum wall-plug efficiency and threshold current density were 7.1%and 1.18 kA/cm2,respectively.The device can operate in CW mode up to 408 K with an output power of 160 mW. | Teng Fei Shenqiang Zhai Jinchuan Zhang Ning Zhuo Junqi Liu Lijun Wang Shuman Liu Zhiwei Jia Kun Li Yongqiang Sun Kai Guo Fengqi Liu Zhanguo Wang | 2021 | Journal of Semiconductors2021，42，11： | 3 |
| 2 | InAs-based interband cascade lasers at 4.0 μm operating at room temperature显示文摘InAs-based interband cascade lasers(ICLs) with InAs plasmon waveguides or InAs/AlSb superlattice(SL) waveguides were demonstrated at emission wavelengths below 4.1 μm. The threshold current densities of the lasers with SL waveguides were 37 A/cm^2 at 77 K in continuous wave mode. The operation temperature of these lasers reached room temperature in pulsed mode. Compared with the thick InAs n++ plasmon cladding layer, the InAs/AlSb superlattice cladding layers have greater advantages for ICLs with wavelengths less than 4 μm even in InAs based ICLs because in the short-wavelength region they have a higher confinement factor than InAs plasmon waveguides. | Tian Yu Shuman Liu Jinchuan Zhang Bo Xu Lijun Wang Junqi Liu Ning Zhuo Shenqiang Zhai Xiaoling Ye Yonghai Chen Fengqi Liu Zhanguo Wang | 2018 | Journal of Semiconductors2018，39，11： | 3 |
| 3 | Room temperature continuous wave operation of quantum cascade laser atλ~9.4μm显示文摘Continuous wave(CW) operation of long wave infrared(LWIR) quantum cascade lasers(QCLs) is achieved up to a temperature of 303 K. For room temperature CW operation, the wafer with 35 stages was processed into buried heterostructure lasers. For a 2-mm-long and 10-μm-wide laser with high-reflectivity(HR) coating on the rear facet, CW output power of 45 m W at 283 K and 9 m W at 303 K is obtained. The lasing wavelength is around 9.4 μm locating in the LWIR spectrum range. | Chuncai Hou Yue Zhao Jinchuan Zhang Shenqiang Zhai Ning Zhuo Junqi Liu Lijun Wang Shuman Liu Fengqi Liu Zhanguo Wang | 2018 | Journal of Semiconductors2018，39，3： | 1 |
| 4 | Coupled-ridge waveguide quantum cascade laser array lasing at λ~5μm显示文摘In this work,we demonstrated high-power quantum cascade laser(QCL)arrays lasing at λ~5μm by employing an optimized coupled-ridge waveguide(CRW)structure.Five-element QCL arrays were simulated and fabricated through a two-step etching method to extend the CRW structure to a mid-wave infrared regime.A lateral far-field with the main peak near a diffraction-limited intensity curve of about 10°was observed by properly designing a geometric shape of the ridges and interspaces.By introducing a buried 2nd-order distributed feedback(DFB)grating,substrate emission with a radiation power above 1 W at 25℃ is achieved.Single longitudinal mode operation is obtained by changing the temperature of the heatsink with a good linear wavelength tuning coefficient of -0.2 cm^(-1)/K. | Pengchang Yang Jinchuan Zhang Zenghui Gu Chuanwei Liu Yue Zhao Fengmin Cheng Shenqiang Zhai Ning Zhuo Junqi Liu Lijun Wang Shuman Liu Fengqi Liu | 2021 | Journal of Semiconductors2021，42，9： | 1 |
| 5 | 14 μm quantum cascade lasers based on diagonal transition and nonresonant extraction显示文摘We report In P-based room-temperature high-average-power quantum cascade lasers emitting at 14 μm. Using a novel active region design, a diagonal bound-to-bound lasing transition is guaranteed by efficient electron injection into the upper laser level and fast nonresonant electron extraction through a miniband from the lower laser level. For a 4 mm long and 40 μm wide double channel ridge waveguide laser with 55 stages of the active region, the threshold current density is only 3.13 k A∕cm^2 at room temperature. At 293 K, the maximum singlefacet peak power and average power are up to 830 m W and 75 m W, respectively. The laser exhibits a characteristic temperature T0 of 395 K over a temperature range from 293 to 353 K. | Shouzhu Niu Junqi Liu Fengmin Cheng Huan Wang Jinchuan Zhang Ning Zhuo Shenqiang Zhai Lijun Wang Shuman Liu Fengqi Liu Zhanguo Wang Xiaohua Wang Zhipeng Wei | 2019 | Photonics Research2019，7，11： | 1 |
| 6 | Contents of Heavy Metals in Typical Aquatic Products from a Market in Binzhou显示文摘To evaluate the levels of heavy metal pollution and risks in consumption of aquatic products from a market in Binzhou,the contents of Cu,Zn,Cd,Cr and Pb in the edible part of eight aquatic species such as Ctenopharyngodon idellus were determined by inductively coupled plasma mass spectrometry.The results show that the levels of the five elements differed among different species of aquatic products.The ability of bivalves to accumulate heavy metals was significantly higher than that of fish.Compared with relevant food hygiene standards,there was a certain excess of Cr in Ruditapes philippinarum and Penaeus vannamei.The results of human exposure risk assessment show that the THQ values of the heavy metals in the eight aquatic species were all less than 1,indicating that the consumption of these aquatic products had no potential non-carcinogenic risks. | Xuekang ZHANG Zaiwang ZHANG Zhuang REN Linlin ZHAO Hui YU Shenqiang ZHAI | 2019 | Asian Agricultural Research2019，11，11： | 0 |
| 7 | Continuous-wave single-mode quantum cascade laser at 5.1 THz based on graded sampled grating design显示文摘We report on the terahertz(THz)quantum cascade lasers in continuous-wave(CW)operation with an emitting frequency above 5 THz.Excellent performance with a smaller leakage current and higher population inversion efficiency is obtained by one-well bridged bound-to-continuum hybrid quantum design at 5 THz.By designing and fabricating a graded metallic sampled distributed feedback grating in the waveguide,the first single-mode THz quantum cascade laser at 5.13 THz in CW operation mode is achieved.The maximum single-mode optical power of~48 mW is achieved at 15 K with a side-mode suppression ratio above 24 dB.This will draw great interest in the spectroscopy applications above the 5 THz range for THz quantum cascade lasers. | WEIJIANG LI YU MA YUNFEI XU JUNQI LIU LIJUN WANG NING ZHUO QUANYONG LU JINCHUAN ZHANG SHENQIANG ZHAI SHUMAN LIU FENGQI LIU | 2022 | Photonics Research2022，10，12： | 0 |
| 8 | Dual-mode distributed feedback quantum cascade laser based on stacked 3D monolithic integration for on-chip multi-channel gas sensing显示文摘To facilitate the development of on-chip integrated mid-infrared multi-channel gas sensing systems,we propose a high-power dual-mode(7.01 and 7.5μm)distributed feedback quantum cascade laser based on stacked 3D monolithic integration.Longitudinal mode control is achieved by preparing longitudinal nested bi-periodic compound one-dimensional Bragg gratings along the direction of the cavity length in the confinement layer.Additionally,transverse coherent coupling ridges perpendicular to the cavity length direction are fabricated in the upper waveguide layer to promote the fundamental transverse mode output when all ridges are in phase.Stable dual-wavelength simultaneous emission with a side-mode suppression ratio of more than 20 dB was achieved by holographic exposure and wet etching.The entire spectral tuning range covers nearly 100 nm through joint tuning of the injection current and heat-sink temperature.High peak power and beam quality are guaranteed by the parallel coherent integration of seven-element ridge arrays.The device operates in a fundamental supermode with a single-lobed far-field pattern,and its peak output power reaches 3.36 W in pulsed mode at 20℃.This dual-mode laser chip has the potential for in-situ on-chip simultaneous detection of CH4and C2H6gases in leak monitoring. | XIYU LU YANJIAO GUAN PENGCHANG YANG SHAN NIU YU MA LIJUN WANG NING ZHUO JINCHUAN ZHANG SHENQIANG ZHAI FENGMIN CHENG SHUMAN LIU FENGQI LIU JUNQI LIU | 2023 | Photonics Research2023，11，12： | 0 |
| 9 | High-power distributed feedback lasers based on InP corrugated sidewalls atλ~2μm显示文摘We report a high-power single-mode InP-based 2μm distributed feedback(DFB)laser with a second-order buried grating and corrugated sidewalls.A second-order semiconductor grating is used for in-plane feedback and vertical out-coupling.The corrugated sidewalls are used to eliminate higher-order transverse modes.For the DFB laser with a 2 mm long cavity and 15μm wide ridge,the maximum continuous-wave edge-emitting and surface-emitting single-mode powers at 300 K are up to 81 and 42 m W,respectively.A single-lobed far-field radiation pattern with a low divergence angle of approximately 8.6°is achieved by a device with a ridge width of 15μm.The single-longitudinal-mode emission wavelength of the fabricated laser can be adjusted from2003.8 nm at 288 K to 2006.9 nm at 313 K without any mode hopping.Robust single-mode emission with a side-mode suppression ratio of 30 dB is achieved under all injection currents and temperature conditions. | YONGQIANG SUN YUNFEI XU JINCHUAN ZHANG FENGMIN CHEN JUNQI LIU SHUMAN LIU QUANYONG LU NING ZHUO LIJUN WANG FENGQI LIU SHENQIANG ZHAI | 2023 | Photonics Research2023，11，8： | 0 |
| 10 | Quantum cascade lasers grown by MOCVD显示文摘Sharing the advantages of high optical power,high efficiency and design flexibility in a compact size,quantum cascade lasers(QCLs)are excellent mid-to-far infrared laser sources for gas sensing,infrared spectroscopic,medical diagnosis,and defense applications.Metalorganic chemical vapor deposition(MOCVD)is an important technology for growing high quality semiconductor materials,and has achieved great success in the semiconductor industry due to its advantages of high efficiency,short maintenance cycles,and high stability and repeatability.The utilization of MOCVD for the growth of QCL materials holds a significant meaning for promoting the large batch production and industrial application of QCL devices.This review summarizes the recent progress of QCLs grown by MOCVD.Material quality and the structure design together determine the device performance.Research progress on the performance improvement of MOCVD-grown QCLs based on the optimization of material quality and active region structure are mainly reviewed. | Yongqiang Sun Guangzhou Cui Kai Guo Jinchuan Zhang Ning Zhuo Lijun Wang Shuman Liu Zhiwei Jia Teng Fei Kun Li Junqi Liu Fengqi Liu Shenqiang Zhai | 2023 | Journal of Semiconductors2023，44，12： | 0 |
| 11 | Optical and electronic anisotropy of a 2D semiconductor SiP显示文摘Two-dimensional anisotropic materials have been widely concerned by researchers because of their great application potential in the field of polarized detector devices and optical elements,which is a very important and popular research direction at present.As a IV-V two-dimensional material,silicon phosphide(SiP)has obvious in-plane anisotropy and exhibits excellent optical and electrical anisotropy properties.Herein,the optical anisotropy of SiP is studied by spectrometric ellipsometry measurements and polarization-resolved optical microscopy,and its electrical anisotropy is tested by SiP-based field-effect transistor.In addition,the normal and anisotropic photoelectric performance of SiP is shown by fabricating a photodetector and measuring it.In various measurements,SiP exhibits obvious anisotropy and good photoelectric performance.This work provides basic optical,electrical,and photoelectric performance information of SiP,and lays a foundation for further study of SiP and applications of SiP-based devices. | Shijun Hou Zhengfeng Guo Tao Xiong Xingang Wang Juehan Yang Yue-Yang Liu Zhi-Chuan Niu Shiyuan Liu Bing Liu Shenqiang Zhai Honggang Gu Zhongming Wei | 2022 | Nano Research2022，15，9： | 0 |
| 12 | Mode-switchable dual-color infrared quantum cascade detector显示文摘In this paper,a patch-antenna-array enhanced quantum cascade detector with freely switchable operating modes among mid-wave,long-wave,and dual-color was proposed and discussed.The dual-color absorption occurs in a single active region through an optimized coupled miniband diagonal-transition subbands arrangement,and a successful separation of the operation regimes was realized by two nested antenna arrays with different patch sizes up to room temperature.At 77 K,the 5.7-μm channel achieved a peak responsivity of 34.6 mA/W and exhibited a detectivity of 2.0×10^(10)Jones,while the 10.0-μm channel achieved a peak responsivity of 87.5 mA/W,giving a detectivity of 5.0×10^(10)Jones.Under a polarization modulation of the incident light,the minimum cross talk of the mid-wave and the long-wave operating modes was 1:22.5 and 1:7.6,respectively.This demonstration opens a new prospect for multicolor infrared imaging chip integration technology. | YIXUAN ZHU SHENQIANG ZHAI KUN LI KAI GUO QIANGQIANG GUO JINCHUAN ZHANG SHUMAN LIU LIJUN WANG FENGQI LIU JUNQI LIU | 2024 | Photonics Research2024，12，2： | 0 |
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