Review
Chemistry, Multidisciplinary
Kang Wang, Yong Sheng Zhao
Summary: Electrically pumped organic lasers have long been a sought-after technology, and recent progress has been made. Key issues include balanced optical gain, carrier mobility, and excitonic losses, with potential solutions lying in the lasing principle and molecular structures.
Article
Chemistry, Multidisciplinary
Zhiyi Yuan, Xiaotian Tan, Xuerui Gong, Chaoyang Gong, Xin Cheng, Shilun Feng, Xudong Fan, Yu-Cheng Chen
Summary: This study presents a novel concept of bioresponsive microlasers by utilizing interfacial energy transfer based on whispering-gallery-mode (WGM) microdroplet cavities. Manipulation of lasing wavelengths was achieved through changes in gain spectrum induced by energy transfer from binding molecular concentrations at the cavity surface. Tunable lasing wavelengths across a broad spectral range were demonstrated by selecting different donor/acceptor pairs, opening up new avenues for biodetection and providing insights into molecular modulation of laser light at the biointerface for the development of smart bio-photonic devices at the molecular level.
Article
Physics, Multidisciplinary
Feifei Qin, Yang Sun, Ying Yang, Xin Li, Xu Wang, Junfeng Lu, Yongjin Wang, Gangyi Zhu
Summary: In this paper, a GaN-based laser with an integrated PN junction heater on Si is fabricated. The temperature(controlled by temperature) and Joule heater provide the ability to conveniently tune the lasing properties. The device achieves optically pumped lasing with single mode and dynamic switching of its lasing mode, which may benefit future chip-based optoelectronic devices.
Article
Materials Science, Multidisciplinary
Venkata Siva Gummaluri, Murukeshan Vadakke Matham
Summary: The study demonstrates the use of SLA technology to fabricate structures suitable for random lasing and investigates the tunability of lasing properties by changing the diameter of microchannels. The results show that wavelength tunability can be achieved by varying the hole diameter and injecting different liquid gain media.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Alessandra Di Gaspare, Valentino Pistore, Elisa Riccardi, Eva A. A. Pogna, Harvey E. Beere, David A. Ritchie, Lianhe Li, Alexander Giles Davies, Edmund H. Linfield, Andrea C. Ferrari, Miriam S. Vitiello
Summary: This study demonstrates mode-locking in surface-emitting electrically pumped random quantum cascade lasers at terahertz frequencies by exploiting the giant third-order nonlinearity of semiconductor heterostructure lasers and the nonlinear properties of graphene. Self-induced phase-coherence between naturally incoherent random modes and phase-locked random modes are achieved using lithographically patterning a multilayer graphene film or coupling a saturable absorber graphene reflector. This milestone in the physics of disordered systems paves the way for miniaturized, electrically pumped mode-locked light sources for various applications.
Article
Optics
Qi Lin, Jie Huang, Liying Lin, Wei Luo, Wen Gu, Kei May Lau
Summary: This article reports on the continuous wave lasing of 980nm electrically pumped quantum well lasers directly grown on silicon, and compares them with lasers grown on other substrates. The results show that although lasers grown on silicon have slightly higher threshold current, it still demonstrates a promising step towards realizing quantum well lasers on silicon.
Article
Nanoscience & Nanotechnology
Hongwu Tang, Fang Luo, Ziru Cui, Yang Xiao, Wei Xu, Zhihong Zhu, Shula Chen, Xiao Wang, Yanping Liu, Jinbin Wang, Gang Peng, Shiqiao Qin, Mengjian Zhu
Summary: Facile control of the wavelength of light emitters is crucial for optoelectronics and photonics applications. In this study, by utilizing the Joule heating effect, the refractive index of silicon-based waveguides can be modulated for reconfigurable nanophotonic circuits. The authors demonstrate electrically controlled wavelength-tunable photoluminescence from vertical van der Waals heterostructures combined by graphene and 2D-TMDCs. The electric control of the PL wavelength and the bandgap reduction of TMDCs are reversible and can be achieved by applying a moderate electric field to the graphene substrate.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Shiyun Lin, Qi Ou, Zhigang Shuai
Summary: This work theoretically screens out promising electrically pumped organic laser compounds and provides better and more efficient molecular design of TADF gain materials, which is believed to benefit this field significantly.
ACS MATERIALS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Qiuliang Zhong, Cheng Wu, Xiaoming Yu, Xuan Yu, Zhenhua Li, Qian Qiao, Yingtang Zhou, Yu Cao
Summary: In recent years, self-powered Schottky ultraviolet photodetectors have gained attention due to their low cost and zero-bias response. However, weak light response has limited the development of high-performance self-powered Schottky devices. In this study, the introduction of a MgxZn1-xO capping layer improved the device performance, resulting in increased photocurrent, responsivity, and linear dynamic range.
Article
Nanoscience & Nanotechnology
Bahareh Marzban, Lukas Seidel, Teren Liu, Kui Wu, Vivien Kiyek, Marvin Hartwig Zoellner, Zoran Ikonic, Joerg Schulze, Detlev Grutzmacher, Giovanni Capellini, Michael Oehme, Jeremy Witzens, Dan Buca
Summary: SiGeSn materials show great potential for mid-infrared applications. In this study, an electrically pumped GeSn microring laser based on SiGeSn/GeSn heterostructures is demonstrated. The ring shape allows for enhanced strain relaxation, leading to improved optical properties and carrier guiding. Partial undercutting of the ring further promotes strain relaxation while maintaining adequate heat sinking. Lasing is achieved at temperatures up to 90 K, with a T0 of 75 K. The scaling of the threshold current density with the inverse of the outer circumference is attributed to optical losses at the etched surface. The results of this study will guide further optimization of the device towards improving electrical injection and increasing the bandgap directness of the active material using stressors.
Article
Chemistry, Multidisciplinary
Pengfei Guo, Qian Yang, Xia Shen, Qihang Lv, Yuying Hao, Liantuan Xiao, Johnny C. Ho, Kin Man Yu
Summary: This article reports on the demonstration of broadband-tunable, single-mode nanolasers based on high-quality alloyed single crystalline CdS1-xSex (x = 0-1) nanotripods. The article shows that these nanolasers have tunable emissions, single-mode lasing, and high-quality factors. The study also reveals the capability of CdS1-xSex alloys to have tunable bandgaps and successfully constructs a wavelength continuously tunable nanolaser.
Article
Optics
Anwar Kerchaoui, Alexandru Mereuta, Andrei Caliman, Cyril Paranthoen, Christophe Levallois, Thomas Batte, Cyril Hamel, Steve Bouhier, Alain Le Corre, Eli Kapon, Mehdi Alouini
Summary: Class A shot-noise limited operation has been achieved in an electrically pumped VECSEL, allowing for noiseless laser oscillation integration in applications with low power consumption and footprint requirements. Proper optimization of cavity dimensions enables single frequency operation without intracavity filtering components, leading to shot-noise limited intensity noise spectra.
Article
Physics, Applied
Kun Ge, Ben Niu, Fangyuan Liu, Jun Ruan, Zhiyang Xu, Dan Guo, Xiaolei Wang, Linzheng Lv, Tianrui Zhai
Summary: We present a hybrid cavity designed to manipulate lasing modes using a metal-dielectric core-shell hybrid microcavity fabricated using a simple brush-coating method. The proposed laser device can achieve single and multiple modes by balancing loss and gain. Additionally, we achieve electrically tunable whispering-gallery-mode lasing in the hybrid microcavity by employing the thermo-optic effect.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Lars Persson, Filip Hjort, Giulia Cardinali, Johannes Enslin, Tim Kolbe, Tim Wernicke, Michael Kneissl, Joachim Ciers, Asa Haglund
Summary: A concept for achieving a temperature-stable lasing wavelength in VCSELs is proposed and demonstrated. By incorporating a dielectric material with a negative thermo-optic coefficient in the DBRs, the positive dn/dT of the semiconductor cavity can be compensated and the redshift of the lasing wavelength can be avoided. This concept is validated for optically-pumped VCSELs emitting at 310 nm, showing a maximum blueshift of less than 0.1 nm over an 80 degrees C range.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Applied
Fangtao Li, Zheng Yang, Mingming Jiang, Chunfeng Wang, Jianguo Xi, Yufei Zhang, Caofeng Pan, Junfeng Lu, Rongming Wang
Summary: Cesium lead halide perovskites have shown potential in photoelectric devices due to their high efficiency and tunable bandgap. CsPbBr3 microwires were prepared with high quality, and CsPbClxBr3-x alloys with wavelength tunable lasing emission were obtained through gas-phase anion exchange. This work expands the practical application of lead halide perovskites.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Xiaoshuang Liu, Junran Zhang, Binjie Xu, Yunhao Lu, Yiqiang Zhang, Rong Wang, Deren Yang, Xiaodong Pi
Summary: The role of dopants on deformation and mechanical properties of 4H silicon carbide (4H-SiC) was investigated using nanoindentation. It was found that different dopants can significantly affect the hardness, elastic modulus, and fracture toughness of 4H-SiC, as well as the formation of dislocations and cracks during nanoindentation. Moreover, polymorph transitions from 4H-SiC to amorphous SiC and 3C-SiC were observed. These findings provide valuable insights for the design of processing methods for differently doped 4H-SiC substrate wafers.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Yuanchao Huang, Rong Wang, Naifu Zhang, Yiqiang Zhang, Deren Yang, Xiaodong Pi
Summary: This study investigates the role of hydrogen in the growth of HPSI 4H-SiC single crystals, revealing that it significantly mitigates N doping while hardly affecting B doping. The study also reveals that adjusting the relative B and N doping concentrations has a substantial impact on the Fermi energy of HPSI 4H-SiC.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Jie Hu, Houwei Pang, Yuan Wang, Deren Yang, Dongsheng Li
Summary: A long-term reliable Erbium doped light emitting device based on npn heterojunction structure has been developed. The device demonstrates a linear relation between the electroluminescence intensity of Er3+ ions and the operating currents. The device with a 3V onset voltage can operate for over 1200 hours due to the separation and acceleration of electrons that excite Er3+ ions. This npn heterojunction device structure can also be applied to other rare earths like Tm, Eu, etc., which opens up possibilities for electroluminescence of rare earths and integrated silicon photonics.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Liang Ji, Sai Luo, Lei Li, Ningkang Qian, Xiao Li, Junjie Li, Jingbo Huang, Xingqiao Wu, Hui Zhang, Deren Yang
Summary: Developing high-performance electrocatalysts for hydrogen evolution reaction in alkaline media is challenging but desirable for water splitting. A wet chemistry method was used to synthesize RuCu nanoflowers with tunable atomic ratios. The Ru3Cu NFs exhibited excellent catalytic properties, requiring only 55 mV for a current density of 10 mA cm(-2) and showing minimal decay after 2000 cycles. The flower-like structure and introduction of Cu improved the HER performance by providing more active sites and modulating the electronic structure of Ru.
NANOSCALE ADVANCES
(2023)
Article
Physics, Applied
Rong Wang, Yuanchao Huang, Deren Yang, Xiaodong Pi
Summary: The widespread application of 4H silicon carbide (4H-SiC) is imminent due to the increasing fabrication of high-power electronics based on 4H-SiC, promoting low-carbon development worldwide. Additionally, researchers are intensively exploring 4H-SiC as a platform for wafer-scale integration of semiconductor and quantum technologies in the field of quantum technologies. Given the significance of impurities and defects in semiconductors, a comprehensive understanding of impurities and defects in 4H-SiC is crucial. This Perspective summarizes recent experimental and theoretical advancements in impurity and defect research in 4H-SiC, along with a brief historical overview. Furthermore, the discussion covers impurity engineering and defect engineering to fully realize the potential of 4H-SiC, followed by an outline of the challenges in studying impurities and defects in 4H-SiC.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Xiaoshuang Liu, Yazhe Wang, Xi Zhang, Yunhao Lu, Rong Wang, Deren Yang, Xiaodong Pi
Summary: We investigated the crack-healing mechanism of 4H silicon carbide (4H-SiC) and found that high-temperature thermal annealing in the air atmosphere effectively heals indentation-induced cracks in undoped 4H-SiC by the formation and viscous flow of SiO2. Nitrogen doping assists the atomic diffusion and crack healing of 4H-SiC, while vanadium doping hinders the healing process. The padding of glassy SiO2 is found to effectively recover the bending strength of indented 4H-SiC samples.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Lei Yang, Yuxuan Fan, Xiang Lv, Houwei Pang, Shuai Yuan, Xuegong Yu, Dongsheng Li, Deren Yang
Summary: This work investigates the influence of erbium (Er) doping on the SiNxOy/c-Si interface, and found that activated Er3+ ions can result in a higher positive charge density, leading to band bending and deeper depletion regions. Through deep-level transient spectroscopy (DLTS), a higher density of interface states and wider energy distribution were observed in the Er-doped samples. Energy dispersive X-ray spectroscopy (EDX) analysis further supports the interaction between Er impurities and intrinsic defects at the interface.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Multidisciplinary Sciences
Shengxuan Wang, Hao Cui, Sijia Jin, Xiaodong Pi, Haiyan He, Chunhui Shou, Deren Yang, Lei Wang
Summary: A new anti-reflection strategy is proposed in this study, using soft nanoimprint lithography to prepare textured structures on the outside of SiNx films. Experimental results show that these textured structures have wide spectrum anti-reflection performance.
Article
Chemistry, Multidisciplinary
Sheng'ou Lu, Hongyu Chen, Wei Hang, Rong Wang, Julong Yuan, Xiaodong Pi, Deren Yang, Xuefeng Han
Summary: The effect of nitrogen doping on dislocation proliferation in SiC crystals was investigated. The thermal field and thermal stress during PVT growth were calculated, and the dislocation density was calculated based on the Alexander-Haasen model. By comparing the calculation and experimental results, a possible value of effective stress was proposed to evaluate the effect of nitrogen doping on dislocation density in n-type SiC.
Article
Chemistry, Multidisciplinary
Ningkang Qian, Degong Ding, Liang Ji, Junjie Li, Hui Zhang, Deren Yang
Summary: In this study, three types of core-shell nanocrystals, Au73Pd27@Pt, Au66Pd34@Pt, and Pd@Pt, were successfully constructed using lattice engineering. The strain effect and ligand effect caused by Au were found to enhance the activity of Pt in the electrocatalytic CO2 reduction reaction (EOR). In situ FTIR studies confirmed that the EOR processes on these nanocrystals were dominated by the C2 pathway, which explained the enhancement of EOR activity by the faster kinetics of the C2 pathway producing acetate or acetaldehyde.
Article
Materials Science, Multidisciplinary
Lin Zhang, Hongjun Li, Yu Yang, Deren Yang, Yuanjing Cui, Guodong Qian
Summary: In this study, a host-guest metal-organic framework (MOF) material was prepared to switch between second-harmonic generation (SHG) and two-photon-pumped (TPP) lasing in a single crystal. The use of specific alignment of nonlinear optical (NLO) building units allowed for the observation of polarized SHG and TPP lasing in a single crystal. These findings contribute to a better understanding of polarized NLO responses in MOFs and provide a new perspective for the development of versatile switching NLO materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Huabao Shang, Deren Yang, Dongsheng Li
Summary: We prepared high-intensity luminescent films by doping lithium, which enhances the near-infrared and up-conversion luminescence of erbium silicate by regulating the lattice structure. This method could be universally applicable to enhance luminescence in erbium compounds.
Article
Chemistry, Multidisciplinary
Xiao Li, Ningkang Qian, Liang Ji, Xingqiao Wu, Junjie Li, Jingbo Huang, Yucong Yan, Deren Yang, Hui Zhang
Summary: In this study, a novel Ce-doped Bi2O3 nanosheet electrocatalyst was prepared by a facile solvothermal method for efficient electrochemical CO2 reduction to formate. The Ce-doped Bi2O3 nanosheets exhibited high current density and formate faradaic efficiency. Density functional theory calculations revealed that Ce doping promoted the formation and adsorption of the OCHO* intermediate and inhibited the hydrogen evolution reaction, resulting in high current density and efficiency.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Multidisciplinary
Jingbo Huang, Liang Ji, Xiao Li, Xingqiao Wu, Ningkang Qian, Junjie Li, Yucong Yan, Deren Yang, Hui Zhang
Summary: A seed-mediated approach was developed for the synthesis of PdSn alloy octopods with precisely controlled branches and tunable compositions. These octopod catalysts demonstrated significantly enhanced catalytic activity and stability for ethanol oxidation reaction, providing a promising avenue for the commercialization of direct ethanol fuel cells.
Article
Materials Science, Multidisciplinary
Hailong Wu, Lijia Yao, Wenqian Cao, Yu Yang, Yuanjing Cui, Deren Yang, Guodong Qian
Summary: Lead-halide perovskite nanocrystals (PeNCs) have attractive optical properties, and a host-guest system was constructed by encapsulating PeNCs in a metal-organic framework (MOF) to adjust their properties and enhance their stability and tunability.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)