Article
Nanoscience & Nanotechnology
John Kouvetakis, Patrick M. Wallace, Chi Xu, Dhruve A. Ringwala, Matthew Mircovich, Manuel A. Roldan, Preston T. Webster, Perry C. Grant, Jose Menendez
Summary: A systematic approach to growing ternary Ge1-x-ySixSny semiconductors with high Sn concentrations has been described in this study. The goal is to produce direct band gap materials and approach a critical concentration for the band gap. The experimental results demonstrate the potential of the synthesized films for optoelectronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Chemical
Leonid Mochalov, Alexander Logunov, Vladimir Vorotyntsev
Summary: This study focuses on developing a novel method of gallium purification for the fabrication of semiconductors and optical materials, using distillation in complex oxygen-hydrogen plasma. The purification process, including oxidation and reduction stages, was carried out under low pressure in inductively coupled non-equilibrium RF plasma discharge. In situ Optical Emission Spectroscopy was used to determine intermediate excited species formed during the plasma-chemical purification process.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Review
Chemistry, Physical
Tianwei Duan, Yuanyuan Zhou
Summary: This article first discusses the hierarchical chiral origin factors of PiHs, including intercalation, substitution, and distortion at the intra-crystal level; modification at the crystal interface level; and micro-design beyond the crystal level. Then, it reviews the latest progress in synthesis and characterization methods of chiral PiHs, focusing on the intriguing structures that distinguish chiral PiHs from other semiconductors and chiral materials. Furthermore, it examines representative examples of utilizing the emergent properties of chiral PiHs for achieving versatile device functions. Finally, it provides perspectives on challenges and opportunities in leveraging the chirality in PiHs for transformative device applications.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Mengyu Guan, Yunlong Xie, Yang Zhang, Zixin Gu, Lei Qiu, Zhuojie He, Bingkun Ye, Ady Suwardi, Zhigao Dai, Guogang Li, Guangwei Hu
Summary: Humidity- and moisture-induced degradation has been a longstanding problem in perovskite materials, but a new type of 2D Dion-Jacobson (DJ) perovskite has leveraged moisture to achieve reversible hydrochromic behaviors, improving their long-term stability. By modulating the hydrogen bonds between organic cations and water molecules, the movement of the organic cations is confined to prevent their escape from crystal lattices. The reversible fluorescent transition of these perovskites shows excellent cyclical properties, offering untapped opportunities for reconfigurable optoelectronic applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Rajesh Kumar Ulaganathan, Pradip Kumar Roy, Swapnil Milind Mhatre, Raghavan Chinnambedu Murugesan, Wei-Liang Chen, Man-Hong Lai, Ambika Subramanian, Chang-Yu Lin, Yu-Ming Chang, Stela Canulescu, Alex Rozhin, Chi-Te Liang, Raman Sankar
Summary: A stable centimeter-long 2D hybrid perovskite single crystal, (N-MPDA)[PbBr4], using divalent N1-methylpropane-1,3-diammonium cation as an organic spacer, is reported. The single crystal exhibits stable optoelectronic performance, low threshold random lasing, and multi-photon luminescence/multi-harmonic generation. It also shows excellent photoresponsivity and large specific detectivity in a photoconductive device.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Na Li, Songge Zhang, Yalin Peng, Xiuzhen Li, Yangkun Zhang, Congli He, Guangyu Zhang
Summary: Artificial retina technologies aim to restore visual function by mimicking the natural processes of the eye. Recently, 2D semiconductor materials have appeared as a promising candidate for artificial retinal devices. This article reviews the recent developments in the field of 2D semiconductors-based optoelectronics for visual function recovery and explores their potential applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Seong Hoon Yu, Syed Zahid Hassan, Chan So, Mingyun Kang, Dae Sung Chung
Summary: Recent improvements in solution-processed semiconductor materials and optoelectronic devices have led to a growing interest in diversifying and advancing their functionality. This review focuses on the embedding of molecular switches in semiconductors, which can transition between different isomers upon light stimuli, allowing for multifunctionality in optoelectronic devices. The review classifies the mechanisms of each optoelectronic transition driven by molecular switches, regardless of the type of semiconductor material or switch. It also discusses the basic characteristics of molecular switches and the persistent technical and scientific issues associated with each mechanism.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Nguyen Ngan Nguyen, Hyo Chan Lee, Kangkyun Baek, Min Seok Yoo, Hansol Lee, Hyungsub Lim, Shinyoung Choi, Cheol-Joo Kim, SungWoo Nam, Kilwon Cho
Summary: The hybrid graphene template enables the preparation of highly crystalline organic semiconductor thin films with large grain sizes. Compared to conventional graphene templates, phototransistors fabricated on this hybrid template exhibit significantly higher photoresponsivity.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Sascha Feldmann, Timo Neumann, Richard Ciesielski, Richard H. Friend, Achim Hartschuh, Felix Deschler
Summary: Halide perovskites are high-performance semiconductors for optoelectronic devices, with their bandgap tunability using mixtures of different halide ions. The study combines temperature-dependent photoluminescence microscopy with computational modeling to quantify the impact of local bandgap variations on the global photoluminescence yield. Factors such as fabrication temperature, surface energy, and charge recombination constants are key in determining photoluminescence quantum efficiency, and tailored bandgap modulation can further enhance luminescence efficiency. This work provides a new strategy and fabrication guidelines for improving halide perovskite performance in light-emitting and photovoltaic applications.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
Yahui Li, Hongzhi Zhou, Ming Xia, Hongzhi Shen, Tianyu Wang, Haikuo Gao, Xin Sheng, Yanxin Han, Zhong Chen, Letian Dou, Haiming Zhu, Enzheng Shi
Summary: In this study, a series of high-purity 2D tin perovskite bulk crystals were synthesized via a mixed-solvent strategy, and their optoelectronic properties were tunable by engineering the quantum-well thickness and organic ligands. The 2D tin perovskites exhibited excellent lasing performance, with both high-n value and n = 1 perovskite thin flakes demonstrating lasing effects and maintaining lasing characteristics up to room temperature. These findings highlight the tremendous potential of 2D tin perovskites as promising candidates for high-performance lasers.
Article
Materials Science, Multidisciplinary
Le Huu Thong, Cong Ngo, Huynh Thanh Duc, Xiaohong Song, Torsten Meier
Summary: A microscopic approach to high-harmonic generation in crystalline solids is presented, which properly describes degenerate bands and band crossings. The length gauge is found to be advantageous over the velocity gauge, requiring less numerical effort and providing a clear distinction between inter- and intraband contributions. The computed high-harmonic spectra agree well with experimental data and demonstrate the importance of the Berry curvature for even-order harmonics.
Article
Materials Science, Multidisciplinary
Ren Habara, Katsunori Wakabayashi
Summary: In this study, the nonlinear optical and spin conductivities of NbSe2 are numerically calculated using an effective tight-binding model, considering different optical effects such as symmetry manipulation and bulk photovoltaic effect. The results demonstrate that by controlling the polarization of light, current can be generated and its direction can be altered. This finding is significant for the design of opto-spintronic devices based on 2D materials.
Article
Materials Science, Multidisciplinary
Omid Tavakol, Yong Baek Kim
Summary: Nonlinear optical responses in topological semimetals, such as shift current and second-harmonic generation (SHG), are of great interest due to the large responses arising from the momentum-space topological structures. Nodal line semimetals can offer even larger responses at low frequencies, with the SHG response being significantly enhanced by breaking the inversion symmetry. Additionally, a model with intrinsically broken inversion symmetry exhibits singular shift current and SHG responses within a range of parameters.
Article
Physics, Multidisciplinary
M. Isik, A. Karatay, A. N. Ech-Chergui, N. M. Gasanly
Summary: Thallium gallium disulfide (TlGaS2) thin films grown by thermal evaporation method were investigated for their structural, morphological, and optical characteristics. The films exhibited a monoclinic crystalline structure with suitable chemical composition for TlGaS2. The study provides valuable insight into the potential device applications of TlGaS2.
Article
Chemistry, Multidisciplinary
Kwang-Won Park, Raaghesh Vijayan, Trisha L. Andrew
Summary: Organized nano- and microstructures of molecular semiconductors have interesting optical and photonic properties and enhanced charge carrier mobilities. A seed layer of coronene is shown to create 1D nanostructures of an electron-transporting molecule (IFD), which exhibit enhanced light absorption and emission, and greater electron mobilities compared to amorphous films. This structuring approach can be integrated into diode manufacturing routines to realize large-area flexible optoelectronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Optics
Peng Peng, Yonghao Mi, Marianna Lytova, Mathew Britton, Xiaoyan Ding, A. Yu. Naumov, P. B. Corkum, D. M. Villeneuve
Summary: By generating quantum coherence in the ground electronic state of hydrogen molecules, we are able to control the absorption spectrum, making it negative at 12 eV, which is the optical gain. These findings offer new insights into controlling spectral lineshapes and pave the way for achieving lasing without inversion in the XUV spectral range.
Article
Optics
Ziyue Guo, Kailin Hu, Tao Cao, Shaozhen Liu, Jikun Yan, Zhou Li, Qi Xu, Paul B. Corkum, Jiahui Peng
Summary: This paper reports incubation experiments on ultrashort laser energy deposition and material modification control in dielectrics. A practical incubation model is developed by considering different ionization mechanisms, and a pre-pulse scheme is proposed to limit the absorption volume.
Article
Optics
Johannes Bloechl, Johannes Schoetz, Ancyline Maliakkal, Natalija Sreibere, Zilong Wang, Philipp Rosenberger, Peter Hommelhoff, Andre Staudte, Paul B. Corkum, Boris Bergues, Matthias F. Kling
Summary: In this study, we introduce a method for sampling the optical field by utilizing the enhanced near-field of a nanometric needle tip. This method provides reliable characterization of the spatial distribution and temporal evolution of visible light fields, as well as the resolution of the wavefront and orbital angular momentum of light pulses. The method is also polarization sensitive and applicable to vectorial field reconstruction.
Article
Chemistry, Physical
N. Bach, A. Feist, M. Moeller, C. Ropers, S. Schaefer
Summary: Optically excited nanostructures serve as a versatile platform for generating confined nanophononic fields with potential (non-)linear couplings. In this study, a semiconductor membrane patterned with a platinum stripe was utilized to generate high-frequency strain waves, and the ultrafast structural dynamics were monitored using ultrafast convergent beam electron diffraction. The experimental results were reproduced by numerical simulations, revealing the spatiotemporal evolution of lattice dynamics dominated by local rotations.
STRUCTURAL DYNAMICS-US
(2022)
Article
Optics
L. Arias, A. Longa, G. Jargot, A. Pomerleau, P. Lassonde, G. Fan, R. Safaei, P. B. Corkum, F. Boschini, H. Ibrahim, F. Legare
Summary: In this study, ultrashort pulse compression from 300 fs to 17 fs was achieved using multidimensional solitary states (MDSS) in a 1-meter hollow-core fiber (HCF) filled with N2O. The thermal limitations at this repetition rate were mitigated by using a differential pressure configuration, resulting in increased range of repetition rate for MDSS-based compression of sub-picosecond laser pulses.
Article
Multidisciplinary Sciences
Armin Feist, Guanhao Huang, Germaine Arend, Yujia Yang, Jan-Wilke Henke, Arslan Sajid Raja, F. Jasmin Kappert, Rui Ning Wang, Hugo Lourenco-Martins, Zheru Qiu, Junqiu Liu, Ofer Kfir, Tobias J. Kippenberg, Claus Ropers
Summary: In this work, we show the preparation of electron-photon pair states by exploiting the phase-matched interaction between free electrons and the optical microresonator on a photonics chip. This breakthrough provides a foundation for the future development of free-electron quantum optics.
Article
Optics
Sohail A. Jalil, Kashif M. Awan, Idriss A. Ali, Sabaa Rashid, Joshua Baxter, Aleksey Korobenko, Guilmot Ernotte, Andrei Naumov, David M. Villeneuve, Andrg Staudte, Pierre Berini, Lora Ramunno, Giulio Vampa
Summary: This study demonstrates the polarization and phase control of high harmonics using a plasmonic metasurface. By designing and fabricating gold antennas on a silicon crystal, circularly polarized deep-ultraviolet high harmonics were generated from a circularly polarized infrared driver. Our metasurface enhances the circularly polarized harmonics up to approximately 43 times compared to the unpatterned surface.
Article
Optics
Rudolf Haindl, Kerim Koester, John H. Gaida, Maximilian Franz, Armin Feist, Claus Ropers
Summary: We demonstrate photoassisted cold field emission (PFE) from a tungsten tip induced by tunable-wavelength low-power femtosecond laser excitation. The emission current from the apex of the (310)-oriented single-crystalline emitter is shown to linearly depend on the incident laser power, while the effective work function is reduced by the respective photon energy. Our results promote the implementation of the linear regime in laser-triggered cold field emission for ultrafast transmission electron microscopy.
APPLIED PHYSICS B-LASERS AND OPTICS
(2023)
Article
Chemistry, Multidisciplinary
Yonghao Mi, Enliang Wang, Zack Dube, Tian Wang, A. Y. Naumov, D. M. Villeneuve, P. B. Corkum, Andre Staudte
Summary: Using near-infrared, femtosecond laser pulses and coincidence momentum imaging, it is found that the dominant channel after photoionization of a deuterium molecular dimer (D-2-D-2) is the ejection of a deuterium atom within a few hundred femtoseconds, leading to the formation of D-3(+). This pathway of D-3(+) formation from ultracold D-2-D-2 gas may provide insights into the high abundance of H-3(+) in the interstellar medium.
Article
Physics, Multidisciplinary
F. Javier Garcia de Abajo, Claus Ropers
Summary: The modulation of free electrons with light has been found to be effective in producing attosecond electron wave packets. However, existing research mainly focuses on manipulating the longitudinal wave function component, with limited attention given to the transverse degrees of freedom for temporal shaping. In this study, by utilizing parallel light-electron interactions in separate zones, we demonstrate the simultaneous spatial and temporal compression of a convergent electron wave function, resulting in the formation of sub-angstrom focal spots of attosecond duration. This approach opens up new possibilities for exploring ultrafast atomic-scale phenomena, particularly in attosecond scanning transmission electron microscopy.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
John H. Gaida, Hugo Lourenco-Martins, Sergey V. Yalunin, Armin Feist, Murat Sivis, Thorsten Hohage, F. Javier Garcia de Abajo, Claus Ropers
Summary: The paper introduces Lorentz-PINEM for full-field, non-invasive imaging of complex optical near fields at high spatial resolution. The authors use energy-filtered defocus phase-contrast imaging and iterative phase retrieval to reconstruct the phase distribution of interfering surface-bound modes on a plasmonic nanotip. Their approach is applicable for retrieving the spatially varying phase of nanoscale fields and topological modes.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Takashi Nakajima, Tasuku Shinoda, D. M. Villeneuve, Hiromichi Niikura
Summary: This study demonstrates the full mapping of the complex wave function of photoelectrons in two-dimensional momentum space using the interference between different optical transition pathways. The detailed structure of the phase and amplitude distributions of photoelectrons can be resolved within the bandwidth determined by the attosecond XUV pulse.
Article
Optics
G. P. Katsoulis, Z. Dube, P. B. Corkum, A. Staudte, A. Emmanouilidou
Summary: We propose a measure that quantifies chirality in the ionization process of achiral atoms and validate it under realistic experimental conditions. This measure is based on the sign of the scalar triple product of the electron final momentum and the probability of ionization, integrated over all momentum components.
Article
Optics
T. Wang, Z. Dube, Y. Mi, G. Vampa, D. M. Villeneuve, P. B. Corkum, Xiaojun Liu, A. Staudte
Summary: In this study, the semiclassical two-step model is used to investigate subcycle interference structures in the photoelectron momentum distribution. The low-momentum region is found to be particularly sensitive to the ion potential, offering another pathway to probe ultrafast electronic structure dynamics.
Article
Physics, Multidisciplinary
Marcel Moeller, John H. Gaida, Claus Ropers
Summary: The effect of grain size in polycrystalline permalloy films on the pinning and gyration orbits of vortex cores inside magnetic nanoislands is studied. Static pinning is found to be governed by grain boundaries, while samples with larger grains show characteristic changes to the vortex gyration.
PHYSICAL REVIEW RESEARCH
(2022)
