Article
Chemistry, Physical
Patanjali Kambhampati
Summary: Semiconductors with perovskite structures have shown promising performance in photovoltaics, with defect tolerance being a key focus. The ionic lattice of these semiconductors leads to dynamic disorder, potentially connected to the presence of polarons and impacting device performance. Understanding the glassy structural dynamics and their control over optical response is crucial for advancing optoelectronic properties in these materials.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Inorganic & Nuclear
Junzi Li, Zhihang Guo, Shuyu Xiao, Yudi Tu, Tingchao He, Wenjing Zhang
Summary: It has been demonstrated that alloyed perovskite nanocrystals (NCs) with a small amount of Cd element can improve the stability of perovskite NCs. In this study, a series of CsPbxCd1-xBr3 NCs were synthesized using different amounts of CdBr2 as an alloyed metal precursor. The alloyed NCs exhibited a near-unity photoluminescence quantum yield, improved stability, and enhanced electron-phonon coupling strength, indicating their potential application as a laser gain medium.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Dallas P. Strandell, Patanjali Kambhampati
Summary: We performed time-resolved photoluminescence (t-PL) measurements on CsPbBr3 perovskite nanocrystals with a time resolution of 3 ps. Surprisingly, even though these nanocrystals are weakly confined or bulk-like, emissions from multiexcitons were observed with binding energies consistent with strongly confined quantum dots. Both biexciton and triexciton emissions were observed, and the kinetics of the multiexciton populations were analyzed in spectrally integrated form as well as decomposed into exciton, biexciton, and triexciton populations.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Ivo Tanghe, Justinas Butkus, Kai Chen, Ronnie R. Tamming, Shalini Singh, Yera Ussembayev, Kristiaan Neyts, Dries van Thourhout, Justin M. Hodgkiss, Pieter Geiregat
Summary: The refractive index change of 2D semiconductors is crucial for realizing various photonic devices. By utilizing femtosecond interferometry and effective medium algorithm, the time-dependent refractive index of colloidal 2D materials can be measured and calculated, showing significant phase modulation due to excitonic features.
Article
Chemistry, Multidisciplinary
Beibei Tang, Guihai Li, Xuechen Ru, Yan Gao, Zidu Li, Huaibin Shen, Hong-Bin Yao, Fengjia Fan, Jiangfeng Du
Summary: This study evaluates the potential of CsPbBr3 nanocrystals as a gain medium for spin lasers, considering their high degree of polarization. The results show that polarizing the charge using circularly polarized photoexcitation can reduce the optical gain threshold, but prolonging the spin relaxation lifetime is necessary for achieving a spin laser.
Article
Physics, Applied
Nannan Liu, Zeen Zhao, Wenxiu Gao, Yajun Qi, Xinping Zhang, Guoliang Yuan, Jun-Ming Liu
Summary: CsPbBr3 exhibits excellent photoelectric properties and its photoluminescence intensity can be significantly modulated by ferroelectric polarization switching, controlling nonradiative recombination and enhancing the efficiency of radiative combination for potential application in advanced optoelectronic devices.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Zhengyuan Qin, Chunfeng Zhang, Lan Chen, Tao Yu, Xiaoyong Wang, Min Xiao
Summary: Charging nanocrystals with current injection can lift the level degeneracy and generate charged exciton gain with significantly lower excitation density. Electrical switching of amplified spontaneous emission in CsPbBr3 nanocrystal films achieved over 50% threshold reduction due to charged excitons. Our work provides an effective approach to electrically modulated optical gain in colloidal perovskite nanocrystals for advanced laser and information technology applications.
Article
Materials Science, Multidisciplinary
Hirokazu Tahara, Masanori Sakamoto, Toshiharu Teranishi, Yoshihiko Kanemitsu
Summary: This study reports the collective enhancement of quantum coherence in coupled QD films, revealing a significant increase in multiexciton quantum coherence compared to isolated QDs. This cooperative effect is induced by the coherent electronic coupling between QDs, providing insights into enhanced mechanisms in coupled quantum systems for advanced optoelectronic applications.
Article
Chemistry, Physical
Dingbo Chen, Yu-Chang Chen, Guang Zeng, Yu-Chun Li, Xiao-Xi Li, Dong Li, Chao Shen, Nan Chi, Boon S. Ooi, David Wei Zhang, Hong-Liang Lu
Summary: We designed a chip-scale UV photodiode based on a hybrid GaN heterojunction, which can switch the photocurrent direction at different wavelengths using photocurrent switching effect. The device exhibits high responsivity in the UV range and demonstrates special logic operations.
Article
Physics, Multidisciplinary
Jiao Tian, Guoen Weng, Yuejun Liu, Shengjie Chen, Fuyi Cao, Chunhu Zhao, Xiaobo Hu, Xianjia Luo, Junhao Chu, Hidefumi Akiyama, Shaoqiang Chen
Summary: This study demonstrates the generation of 13-ps ultrashort laser pulses through gain-switching techniques in inorganic CsPbBr3 microwires. The results reveal that the low transient saturated gain is a significant limitation for further pulse shortening. These perovskite microwire lasers, with high material gain and short cavity, have potential for various applications requiring ultrashort optical pulses.
COMMUNICATIONS PHYSICS
(2022)
Article
Optics
Yuting Wu, Zhigao Huang, Qi Sun, Van Duong Ta, Sensen Wang, Yue Wang
Summary: With the development of optofluidic technology, liquid lasers have become a focus of research. The use of lead-halide perovskite nanocrystals as gain media has been demonstrated to have significant advantages over organic fluorescent dyes and traditional nanocrystals. A novel microfluidic laser device has been designed and realized, showing excellent performance and potential for practical applications.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Wenna Du, Xianxin Wu, Shuai Zhang, Xinyu Sui, Chuanxiu Jiang, Zhuoya Zhu, Qiuyu Shang, Jianwei Shi, Shuai Yue, Qing Zhang, Jun Zhang, Xinfeng Liu
Summary: Perovskite micro/nanostructures are highly attractive for nanolasers as a gain material. In this study, CsPbBr3 microplatelets with anisotropic properties were obtained and their optical gain was investigated. A polarization-dependent optical gain was observed, with a larger gain along the [002] direction. The highest optical gain value reported so far was achieved along the [002] direction. Furthermore, all optical switching of lasing was realized. These findings provide new insights for the design of novel anisotropic devices based on perovskite micro/nanostructures.
Article
Optics
Alejandro Rosado, Maria R. Fernandez-Ruiz, Pedro Corredera, Jose Manuel G. Tijero, Ignacio Esquivias
Summary: We have demonstrated low and continuously tunable optical frequency combs (OFCs) with line spacing in the kilohertz range. These OFCs are generated by pulsed gain-switching of commercially available semiconductor lasers emitting at around 1.55 μm. After generation, the OFCs are efficiently compressed using pseudo-random-binary-sequence phase modulation. We numerically and experimentally analyzed an OFC generated at a repetition rate of 1 GHz and identified the optimal compression conditions. The compressed comb achieved a factor of 2047 compression and exhibited a flat and broad 90 GHz spectrum consisting of more than 184,000 spectral lines, separated by 488 kHz. This significant compression factor, over 100 times larger than previously reported for gain-switching OFCs, opens up possibilities for the use of potentially integrable gain-switching OFCs in applications requiring sub-megahertz line spacing.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Xueyu Chen, Ge Ding, Linwei Tang, Haijian Zou, Chaofeng Wang, Shuqing Chen, Chenliang Su, Ying Li
Summary: In this investigation, it was found that low-dimensional materials have feasibility and reliability in the development of optical logic gates. By modulating the spatial self-phase modulation patterns through MoS2 dispersions, using the initial intensity, phase, and topological charge of a Gauss vortex superposition interference beam, we successfully implemented novel optical logic gates, including AND, OR, and NOT gates.
Article
Chemistry, Multidisciplinary
Qingyun Wan, Ke Xiao, Zongshang Li, Jihyuk Yang, Ji Tae Kim, Xiaodong Cui, Chi-Ming Che
Summary: Photonic circuit systems based on optical waveguiding heteroarchitectures have the potential to modulate optical signals at the micro- or nanoscale. By using organometallic complexes and supramolecular synthetic approaches, photonic circuit systems with tunable emission color and controllable sequences among different blocks can be prepared.
ADVANCED MATERIALS
(2022)
